equalfuncs.c

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/*-------------------------------------------------------------------------
 *
 * equalfuncs.c
 *    Equality functions to compare node trees.
 *
 * NOTE: we currently support comparing all node types found in parse
 * trees.  We do not support comparing executor state trees; there
 * is no need for that, and no point in maintaining all the code that
 * would be needed.  We also do not support comparing Path trees, mainly
 * because the circular linkages between RelOptInfo and Path nodes can't
 * be handled easily in a simple depth-first traversal.
 *
 * Currently, in fact, equal() doesn't know how to compare Plan trees
 * either.  This might need to be fixed someday.
 *
 * NOTE: it is intentional that parse location fields (in nodes that have
 * one) are not compared.  This is because we want, for example, a variable
 * "x" to be considered equal() to another reference to "x" in the query.
 *
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *    src/backend/nodes/equalfuncs.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"

#include "nodes/relation.h"
#include "utils/datum.h"


/*
 * Macros to simplify comparison of different kinds of fields.  Use these
 * wherever possible to reduce the chance for silly typos.  Note that these
 * hard-wire the convention that the local variables in an Equal routine are
 * named 'a' and 'b'.
 */

/* Compare a simple scalar field (int, float, bool, enum, etc) */
#define COMPARE_SCALAR_FIELD(fldname) \
    do { \
        if (a->fldname != b->fldname) \
            return false; \
    } while (0)

/* Compare a field that is a pointer to some kind of Node or Node tree */
#define COMPARE_NODE_FIELD(fldname) \
    do { \
        if (!equal(a->fldname, b->fldname)) \
            return false; \
    } while (0)

/* Compare a field that is a pointer to a Bitmapset */
#define COMPARE_BITMAPSET_FIELD(fldname) \
    do { \
        if (!bms_equal(a->fldname, b->fldname)) \
            return false; \
    } while (0)

/* Compare a field that is a pointer to a C string, or perhaps NULL */
#define COMPARE_STRING_FIELD(fldname) \
    do { \
        if (!equalstr(a->fldname, b->fldname)) \
            return false; \
    } while (0)

/* Macro for comparing string fields that might be NULL */
#define equalstr(a, b)  \
    (((a) != NULL && (b) != NULL) ? (strcmp(a, b) == 0) : (a) == (b))

/* Compare a field that is a pointer to a simple palloc'd object of size sz */
#define COMPARE_POINTER_FIELD(fldname, sz) \
    do { \
        if (memcmp(a->fldname, b->fldname, (sz)) != 0) \
            return false; \
    } while (0)

/* Compare a parse location field (this is a no-op, per note above) */
#define COMPARE_LOCATION_FIELD(fldname) \
    ((void) 0)

/* Compare a CoercionForm field (also a no-op, per comment in primnodes.h) */
#define COMPARE_COERCIONFORM_FIELD(fldname) \
    ((void) 0)


/*
 *  Stuff from primnodes.h
 */

static bool
_equalAlias(const Alias *a, const Alias *b)
{
    COMPARE_STRING_FIELD(aliasname);
    COMPARE_NODE_FIELD(colnames);

    return true;
}

static bool
_equalRangeVar(const RangeVar *a, const RangeVar *b)
{
    COMPARE_STRING_FIELD(catalogname);
    COMPARE_STRING_FIELD(schemaname);
    COMPARE_STRING_FIELD(relname);
    COMPARE_SCALAR_FIELD(inhOpt);
    COMPARE_SCALAR_FIELD(relpersistence);
    COMPARE_NODE_FIELD(alias);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalIntoClause(const IntoClause *a, const IntoClause *b)
{
    COMPARE_NODE_FIELD(rel);
    COMPARE_NODE_FIELD(colNames);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(onCommit);
    COMPARE_STRING_FIELD(tableSpaceName);
    COMPARE_NODE_FIELD(viewQuery);
    COMPARE_SCALAR_FIELD(skipData);

    return true;
}

/*
 * We don't need an _equalExpr because Expr is an abstract supertype which
 * should never actually get instantiated.  Also, since it has no common
 * fields except NodeTag, there's no need for a helper routine to factor
 * out comparing the common fields...
 */

static bool
_equalVar(const Var *a, const Var *b)
{
    COMPARE_SCALAR_FIELD(varno);
    COMPARE_SCALAR_FIELD(varattno);
    COMPARE_SCALAR_FIELD(vartype);
    COMPARE_SCALAR_FIELD(vartypmod);
    COMPARE_SCALAR_FIELD(varcollid);
    COMPARE_SCALAR_FIELD(varlevelsup);
    COMPARE_SCALAR_FIELD(varnoold);
    COMPARE_SCALAR_FIELD(varoattno);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalConst(const Const *a, const Const *b)
{
    COMPARE_SCALAR_FIELD(consttype);
    COMPARE_SCALAR_FIELD(consttypmod);
    COMPARE_SCALAR_FIELD(constcollid);
    COMPARE_SCALAR_FIELD(constlen);
    COMPARE_SCALAR_FIELD(constisnull);
    COMPARE_SCALAR_FIELD(constbyval);
    COMPARE_LOCATION_FIELD(location);

    /*
     * We treat all NULL constants of the same type as equal. Someday this
     * might need to change?  But datumIsEqual doesn't work on nulls, so...
     */
    if (a->constisnull)
        return true;
    return datumIsEqual(a->constvalue, b->constvalue,
                        a->constbyval, a->constlen);
}

static bool
_equalParam(const Param *a, const Param *b)
{
    COMPARE_SCALAR_FIELD(paramkind);
    COMPARE_SCALAR_FIELD(paramid);
    COMPARE_SCALAR_FIELD(paramtype);
    COMPARE_SCALAR_FIELD(paramtypmod);
    COMPARE_SCALAR_FIELD(paramcollid);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalAggref(const Aggref *a, const Aggref *b)
{
    COMPARE_SCALAR_FIELD(aggfnoid);
    COMPARE_SCALAR_FIELD(aggtype);
    COMPARE_SCALAR_FIELD(aggcollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_NODE_FIELD(aggorder);
    COMPARE_NODE_FIELD(aggdistinct);
    COMPARE_SCALAR_FIELD(aggstar);
    COMPARE_SCALAR_FIELD(agglevelsup);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalWindowFunc(const WindowFunc *a, const WindowFunc *b)
{
    COMPARE_SCALAR_FIELD(winfnoid);
    COMPARE_SCALAR_FIELD(wintype);
    COMPARE_SCALAR_FIELD(wincollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(winref);
    COMPARE_SCALAR_FIELD(winstar);
    COMPARE_SCALAR_FIELD(winagg);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalArrayRef(const ArrayRef *a, const ArrayRef *b)
{
    COMPARE_SCALAR_FIELD(refarraytype);
    COMPARE_SCALAR_FIELD(refelemtype);
    COMPARE_SCALAR_FIELD(reftypmod);
    COMPARE_SCALAR_FIELD(refcollid);
    COMPARE_NODE_FIELD(refupperindexpr);
    COMPARE_NODE_FIELD(reflowerindexpr);
    COMPARE_NODE_FIELD(refexpr);
    COMPARE_NODE_FIELD(refassgnexpr);

    return true;
}

static bool
_equalFuncExpr(const FuncExpr *a, const FuncExpr *b)
{
    COMPARE_SCALAR_FIELD(funcid);
    COMPARE_SCALAR_FIELD(funcresulttype);
    COMPARE_SCALAR_FIELD(funcretset);
    COMPARE_SCALAR_FIELD(funcvariadic);
    COMPARE_COERCIONFORM_FIELD(funcformat);
    COMPARE_SCALAR_FIELD(funccollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalNamedArgExpr(const NamedArgExpr *a, const NamedArgExpr *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_STRING_FIELD(name);
    COMPARE_SCALAR_FIELD(argnumber);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalOpExpr(const OpExpr *a, const OpExpr *b)
{
    COMPARE_SCALAR_FIELD(opno);

    /*
     * Special-case opfuncid: it is allowable for it to differ if one node
     * contains zero and the other doesn't.  This just means that the one node
     * isn't as far along in the parse/plan pipeline and hasn't had the
     * opfuncid cache filled yet.
     */
    if (a->opfuncid != b->opfuncid &&
        a->opfuncid != 0 &&
        b->opfuncid != 0)
        return false;

    COMPARE_SCALAR_FIELD(opresulttype);
    COMPARE_SCALAR_FIELD(opretset);
    COMPARE_SCALAR_FIELD(opcollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalDistinctExpr(const DistinctExpr *a, const DistinctExpr *b)
{
    COMPARE_SCALAR_FIELD(opno);

    /*
     * Special-case opfuncid: it is allowable for it to differ if one node
     * contains zero and the other doesn't.  This just means that the one node
     * isn't as far along in the parse/plan pipeline and hasn't had the
     * opfuncid cache filled yet.
     */
    if (a->opfuncid != b->opfuncid &&
        a->opfuncid != 0 &&
        b->opfuncid != 0)
        return false;

    COMPARE_SCALAR_FIELD(opresulttype);
    COMPARE_SCALAR_FIELD(opretset);
    COMPARE_SCALAR_FIELD(opcollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalNullIfExpr(const NullIfExpr *a, const NullIfExpr *b)
{
    COMPARE_SCALAR_FIELD(opno);

    /*
     * Special-case opfuncid: it is allowable for it to differ if one node
     * contains zero and the other doesn't.  This just means that the one node
     * isn't as far along in the parse/plan pipeline and hasn't had the
     * opfuncid cache filled yet.
     */
    if (a->opfuncid != b->opfuncid &&
        a->opfuncid != 0 &&
        b->opfuncid != 0)
        return false;

    COMPARE_SCALAR_FIELD(opresulttype);
    COMPARE_SCALAR_FIELD(opretset);
    COMPARE_SCALAR_FIELD(opcollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalScalarArrayOpExpr(const ScalarArrayOpExpr *a, const ScalarArrayOpExpr *b)
{
    COMPARE_SCALAR_FIELD(opno);

    /*
     * Special-case opfuncid: it is allowable for it to differ if one node
     * contains zero and the other doesn't.  This just means that the one node
     * isn't as far along in the parse/plan pipeline and hasn't had the
     * opfuncid cache filled yet.
     */
    if (a->opfuncid != b->opfuncid &&
        a->opfuncid != 0 &&
        b->opfuncid != 0)
        return false;

    COMPARE_SCALAR_FIELD(useOr);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalBoolExpr(const BoolExpr *a, const BoolExpr *b)
{
    COMPARE_SCALAR_FIELD(boolop);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalSubLink(const SubLink *a, const SubLink *b)
{
    COMPARE_SCALAR_FIELD(subLinkType);
    COMPARE_NODE_FIELD(testexpr);
    COMPARE_NODE_FIELD(operName);
    COMPARE_NODE_FIELD(subselect);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalSubPlan(const SubPlan *a, const SubPlan *b)
{
    COMPARE_SCALAR_FIELD(subLinkType);
    COMPARE_NODE_FIELD(testexpr);
    COMPARE_NODE_FIELD(paramIds);
    COMPARE_SCALAR_FIELD(plan_id);
    COMPARE_STRING_FIELD(plan_name);
    COMPARE_SCALAR_FIELD(firstColType);
    COMPARE_SCALAR_FIELD(firstColTypmod);
    COMPARE_SCALAR_FIELD(firstColCollation);
    COMPARE_SCALAR_FIELD(useHashTable);
    COMPARE_SCALAR_FIELD(unknownEqFalse);
    COMPARE_NODE_FIELD(setParam);
    COMPARE_NODE_FIELD(parParam);
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(startup_cost);
    COMPARE_SCALAR_FIELD(per_call_cost);

    return true;
}

static bool
_equalAlternativeSubPlan(const AlternativeSubPlan *a, const AlternativeSubPlan *b)
{
    COMPARE_NODE_FIELD(subplans);

    return true;
}

static bool
_equalFieldSelect(const FieldSelect *a, const FieldSelect *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(fieldnum);
    COMPARE_SCALAR_FIELD(resulttype);
    COMPARE_SCALAR_FIELD(resulttypmod);
    COMPARE_SCALAR_FIELD(resultcollid);

    return true;
}

static bool
_equalFieldStore(const FieldStore *a, const FieldStore *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_NODE_FIELD(newvals);
    COMPARE_NODE_FIELD(fieldnums);
    COMPARE_SCALAR_FIELD(resulttype);

    return true;
}

static bool
_equalRelabelType(const RelabelType *a, const RelabelType *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(resulttype);
    COMPARE_SCALAR_FIELD(resulttypmod);
    COMPARE_SCALAR_FIELD(resultcollid);
    COMPARE_COERCIONFORM_FIELD(relabelformat);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCoerceViaIO(const CoerceViaIO *a, const CoerceViaIO *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(resulttype);
    COMPARE_SCALAR_FIELD(resultcollid);
    COMPARE_COERCIONFORM_FIELD(coerceformat);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalArrayCoerceExpr(const ArrayCoerceExpr *a, const ArrayCoerceExpr *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(elemfuncid);
    COMPARE_SCALAR_FIELD(resulttype);
    COMPARE_SCALAR_FIELD(resulttypmod);
    COMPARE_SCALAR_FIELD(resultcollid);
    COMPARE_SCALAR_FIELD(isExplicit);
    COMPARE_COERCIONFORM_FIELD(coerceformat);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalConvertRowtypeExpr(const ConvertRowtypeExpr *a, const ConvertRowtypeExpr *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(resulttype);
    COMPARE_COERCIONFORM_FIELD(convertformat);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCollateExpr(const CollateExpr *a, const CollateExpr *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(collOid);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCaseExpr(const CaseExpr *a, const CaseExpr *b)
{
    COMPARE_SCALAR_FIELD(casetype);
    COMPARE_SCALAR_FIELD(casecollid);
    COMPARE_NODE_FIELD(arg);
    COMPARE_NODE_FIELD(args);
    COMPARE_NODE_FIELD(defresult);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCaseWhen(const CaseWhen *a, const CaseWhen *b)
{
    COMPARE_NODE_FIELD(expr);
    COMPARE_NODE_FIELD(result);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCaseTestExpr(const CaseTestExpr *a, const CaseTestExpr *b)
{
    COMPARE_SCALAR_FIELD(typeId);
    COMPARE_SCALAR_FIELD(typeMod);
    COMPARE_SCALAR_FIELD(collation);

    return true;
}

static bool
_equalArrayExpr(const ArrayExpr *a, const ArrayExpr *b)
{
    COMPARE_SCALAR_FIELD(array_typeid);
    COMPARE_SCALAR_FIELD(array_collid);
    COMPARE_SCALAR_FIELD(element_typeid);
    COMPARE_NODE_FIELD(elements);
    COMPARE_SCALAR_FIELD(multidims);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalRowExpr(const RowExpr *a, const RowExpr *b)
{
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(row_typeid);
    COMPARE_COERCIONFORM_FIELD(row_format);
    COMPARE_NODE_FIELD(colnames);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalRowCompareExpr(const RowCompareExpr *a, const RowCompareExpr *b)
{
    COMPARE_SCALAR_FIELD(rctype);
    COMPARE_NODE_FIELD(opnos);
    COMPARE_NODE_FIELD(opfamilies);
    COMPARE_NODE_FIELD(inputcollids);
    COMPARE_NODE_FIELD(largs);
    COMPARE_NODE_FIELD(rargs);

    return true;
}

static bool
_equalCoalesceExpr(const CoalesceExpr *a, const CoalesceExpr *b)
{
    COMPARE_SCALAR_FIELD(coalescetype);
    COMPARE_SCALAR_FIELD(coalescecollid);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalMinMaxExpr(const MinMaxExpr *a, const MinMaxExpr *b)
{
    COMPARE_SCALAR_FIELD(minmaxtype);
    COMPARE_SCALAR_FIELD(minmaxcollid);
    COMPARE_SCALAR_FIELD(inputcollid);
    COMPARE_SCALAR_FIELD(op);
    COMPARE_NODE_FIELD(args);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalXmlExpr(const XmlExpr *a, const XmlExpr *b)
{
    COMPARE_SCALAR_FIELD(op);
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(named_args);
    COMPARE_NODE_FIELD(arg_names);
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(xmloption);
    COMPARE_SCALAR_FIELD(type);
    COMPARE_SCALAR_FIELD(typmod);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalNullTest(const NullTest *a, const NullTest *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(nulltesttype);
    COMPARE_SCALAR_FIELD(argisrow);

    return true;
}

static bool
_equalBooleanTest(const BooleanTest *a, const BooleanTest *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(booltesttype);

    return true;
}

static bool
_equalCoerceToDomain(const CoerceToDomain *a, const CoerceToDomain *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(resulttype);
    COMPARE_SCALAR_FIELD(resulttypmod);
    COMPARE_SCALAR_FIELD(resultcollid);
    COMPARE_COERCIONFORM_FIELD(coercionformat);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCoerceToDomainValue(const CoerceToDomainValue *a, const CoerceToDomainValue *b)
{
    COMPARE_SCALAR_FIELD(typeId);
    COMPARE_SCALAR_FIELD(typeMod);
    COMPARE_SCALAR_FIELD(collation);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalSetToDefault(const SetToDefault *a, const SetToDefault *b)
{
    COMPARE_SCALAR_FIELD(typeId);
    COMPARE_SCALAR_FIELD(typeMod);
    COMPARE_SCALAR_FIELD(collation);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCurrentOfExpr(const CurrentOfExpr *a, const CurrentOfExpr *b)
{
    COMPARE_SCALAR_FIELD(cvarno);
    COMPARE_STRING_FIELD(cursor_name);
    COMPARE_SCALAR_FIELD(cursor_param);

    return true;
}

static bool
_equalTargetEntry(const TargetEntry *a, const TargetEntry *b)
{
    COMPARE_NODE_FIELD(expr);
    COMPARE_SCALAR_FIELD(resno);
    COMPARE_STRING_FIELD(resname);
    COMPARE_SCALAR_FIELD(ressortgroupref);
    COMPARE_SCALAR_FIELD(resorigtbl);
    COMPARE_SCALAR_FIELD(resorigcol);
    COMPARE_SCALAR_FIELD(resjunk);

    return true;
}

static bool
_equalRangeTblRef(const RangeTblRef *a, const RangeTblRef *b)
{
    COMPARE_SCALAR_FIELD(rtindex);

    return true;
}

static bool
_equalJoinExpr(const JoinExpr *a, const JoinExpr *b)
{
    COMPARE_SCALAR_FIELD(jointype);
    COMPARE_SCALAR_FIELD(isNatural);
    COMPARE_NODE_FIELD(larg);
    COMPARE_NODE_FIELD(rarg);
    COMPARE_NODE_FIELD(usingClause);
    COMPARE_NODE_FIELD(quals);
    COMPARE_NODE_FIELD(alias);
    COMPARE_SCALAR_FIELD(rtindex);

    return true;
}

static bool
_equalFromExpr(const FromExpr *a, const FromExpr *b)
{
    COMPARE_NODE_FIELD(fromlist);
    COMPARE_NODE_FIELD(quals);

    return true;
}


/*
 * Stuff from relation.h
 */

static bool
_equalPathKey(const PathKey *a, const PathKey *b)
{
    /* We assume pointer equality is sufficient to compare the eclasses */
    COMPARE_SCALAR_FIELD(pk_eclass);
    COMPARE_SCALAR_FIELD(pk_opfamily);
    COMPARE_SCALAR_FIELD(pk_strategy);
    COMPARE_SCALAR_FIELD(pk_nulls_first);

    return true;
}

static bool
_equalRestrictInfo(const RestrictInfo *a, const RestrictInfo *b)
{
    COMPARE_NODE_FIELD(clause);
    COMPARE_SCALAR_FIELD(is_pushed_down);
    COMPARE_SCALAR_FIELD(outerjoin_delayed);
    COMPARE_BITMAPSET_FIELD(required_relids);
    COMPARE_BITMAPSET_FIELD(outer_relids);
    COMPARE_BITMAPSET_FIELD(nullable_relids);

    /*
     * We ignore all the remaining fields, since they may not be set yet, and
     * should be derivable from the clause anyway.
     */

    return true;
}

static bool
_equalPlaceHolderVar(const PlaceHolderVar *a, const PlaceHolderVar *b)
{
    /*
     * We intentionally do not compare phexpr.  Two PlaceHolderVars with the
     * same ID and levelsup should be considered equal even if the contained
     * expressions have managed to mutate to different states.  One way in
     * which that can happen is that initplan sublinks would get replaced by
     * differently-numbered Params when sublink folding is done.  (The end
     * result of such a situation would be some unreferenced initplans, which
     * is annoying but not really a problem.)
     *
     * COMPARE_NODE_FIELD(phexpr);
     */
    COMPARE_BITMAPSET_FIELD(phrels);
    COMPARE_SCALAR_FIELD(phid);
    COMPARE_SCALAR_FIELD(phlevelsup);

    return true;
}

static bool
_equalSpecialJoinInfo(const SpecialJoinInfo *a, const SpecialJoinInfo *b)
{
    COMPARE_BITMAPSET_FIELD(min_lefthand);
    COMPARE_BITMAPSET_FIELD(min_righthand);
    COMPARE_BITMAPSET_FIELD(syn_lefthand);
    COMPARE_BITMAPSET_FIELD(syn_righthand);
    COMPARE_SCALAR_FIELD(jointype);
    COMPARE_SCALAR_FIELD(lhs_strict);
    COMPARE_SCALAR_FIELD(delay_upper_joins);
    COMPARE_NODE_FIELD(join_quals);

    return true;
}

static bool
_equalLateralJoinInfo(const LateralJoinInfo *a, const LateralJoinInfo *b)
{
    COMPARE_SCALAR_FIELD(lateral_rhs);
    COMPARE_BITMAPSET_FIELD(lateral_lhs);

    return true;
}

static bool
_equalAppendRelInfo(const AppendRelInfo *a, const AppendRelInfo *b)
{
    COMPARE_SCALAR_FIELD(parent_relid);
    COMPARE_SCALAR_FIELD(child_relid);
    COMPARE_SCALAR_FIELD(parent_reltype);
    COMPARE_SCALAR_FIELD(child_reltype);
    COMPARE_NODE_FIELD(translated_vars);
    COMPARE_SCALAR_FIELD(parent_reloid);

    return true;
}

static bool
_equalPlaceHolderInfo(const PlaceHolderInfo *a, const PlaceHolderInfo *b)
{
    COMPARE_SCALAR_FIELD(phid);
    COMPARE_NODE_FIELD(ph_var);
    COMPARE_BITMAPSET_FIELD(ph_eval_at);
    COMPARE_BITMAPSET_FIELD(ph_needed);
    COMPARE_BITMAPSET_FIELD(ph_may_need);
    COMPARE_SCALAR_FIELD(ph_width);

    return true;
}


/*
 * Stuff from parsenodes.h
 */

static bool
_equalQuery(const Query *a, const Query *b)
{
    COMPARE_SCALAR_FIELD(commandType);
    COMPARE_SCALAR_FIELD(querySource);
    /* we intentionally ignore queryId, since it might not be set */
    COMPARE_SCALAR_FIELD(canSetTag);
    COMPARE_NODE_FIELD(utilityStmt);
    COMPARE_SCALAR_FIELD(resultRelation);
    COMPARE_SCALAR_FIELD(hasAggs);
    COMPARE_SCALAR_FIELD(hasWindowFuncs);
    COMPARE_SCALAR_FIELD(hasSubLinks);
    COMPARE_SCALAR_FIELD(hasDistinctOn);
    COMPARE_SCALAR_FIELD(hasRecursive);
    COMPARE_SCALAR_FIELD(hasModifyingCTE);
    COMPARE_SCALAR_FIELD(hasForUpdate);
    COMPARE_NODE_FIELD(cteList);
    COMPARE_NODE_FIELD(rtable);
    COMPARE_NODE_FIELD(jointree);
    COMPARE_NODE_FIELD(targetList);
    COMPARE_NODE_FIELD(returningList);
    COMPARE_NODE_FIELD(groupClause);
    COMPARE_NODE_FIELD(havingQual);
    COMPARE_NODE_FIELD(windowClause);
    COMPARE_NODE_FIELD(distinctClause);
    COMPARE_NODE_FIELD(sortClause);
    COMPARE_NODE_FIELD(limitOffset);
    COMPARE_NODE_FIELD(limitCount);
    COMPARE_NODE_FIELD(rowMarks);
    COMPARE_NODE_FIELD(setOperations);
    COMPARE_NODE_FIELD(constraintDeps);

    return true;
}

static bool
_equalInsertStmt(const InsertStmt *a, const InsertStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(cols);
    COMPARE_NODE_FIELD(selectStmt);
    COMPARE_NODE_FIELD(returningList);
    COMPARE_NODE_FIELD(withClause);

    return true;
}

static bool
_equalDeleteStmt(const DeleteStmt *a, const DeleteStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(usingClause);
    COMPARE_NODE_FIELD(whereClause);
    COMPARE_NODE_FIELD(returningList);
    COMPARE_NODE_FIELD(withClause);

    return true;
}

static bool
_equalUpdateStmt(const UpdateStmt *a, const UpdateStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(targetList);
    COMPARE_NODE_FIELD(whereClause);
    COMPARE_NODE_FIELD(fromClause);
    COMPARE_NODE_FIELD(returningList);
    COMPARE_NODE_FIELD(withClause);

    return true;
}

static bool
_equalSelectStmt(const SelectStmt *a, const SelectStmt *b)
{
    COMPARE_NODE_FIELD(distinctClause);
    COMPARE_NODE_FIELD(intoClause);
    COMPARE_NODE_FIELD(targetList);
    COMPARE_NODE_FIELD(fromClause);
    COMPARE_NODE_FIELD(whereClause);
    COMPARE_NODE_FIELD(groupClause);
    COMPARE_NODE_FIELD(havingClause);
    COMPARE_NODE_FIELD(windowClause);
    COMPARE_NODE_FIELD(valuesLists);
    COMPARE_NODE_FIELD(sortClause);
    COMPARE_NODE_FIELD(limitOffset);
    COMPARE_NODE_FIELD(limitCount);
    COMPARE_NODE_FIELD(lockingClause);
    COMPARE_NODE_FIELD(withClause);
    COMPARE_SCALAR_FIELD(op);
    COMPARE_SCALAR_FIELD(all);
    COMPARE_NODE_FIELD(larg);
    COMPARE_NODE_FIELD(rarg);

    return true;
}

static bool
_equalSetOperationStmt(const SetOperationStmt *a, const SetOperationStmt *b)
{
    COMPARE_SCALAR_FIELD(op);
    COMPARE_SCALAR_FIELD(all);
    COMPARE_NODE_FIELD(larg);
    COMPARE_NODE_FIELD(rarg);
    COMPARE_NODE_FIELD(colTypes);
    COMPARE_NODE_FIELD(colTypmods);
    COMPARE_NODE_FIELD(colCollations);
    COMPARE_NODE_FIELD(groupClauses);

    return true;
}

static bool
_equalAlterTableStmt(const AlterTableStmt *a, const AlterTableStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(cmds);
    COMPARE_SCALAR_FIELD(relkind);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalAlterTableCmd(const AlterTableCmd *a, const AlterTableCmd *b)
{
    COMPARE_SCALAR_FIELD(subtype);
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(def);
    COMPARE_SCALAR_FIELD(behavior);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalAlterDomainStmt(const AlterDomainStmt *a, const AlterDomainStmt *b)
{
    COMPARE_SCALAR_FIELD(subtype);
    COMPARE_NODE_FIELD(typeName);
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(def);
    COMPARE_SCALAR_FIELD(behavior);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalGrantStmt(const GrantStmt *a, const GrantStmt *b)
{
    COMPARE_SCALAR_FIELD(is_grant);
    COMPARE_SCALAR_FIELD(targtype);
    COMPARE_SCALAR_FIELD(objtype);
    COMPARE_NODE_FIELD(objects);
    COMPARE_NODE_FIELD(privileges);
    COMPARE_NODE_FIELD(grantees);
    COMPARE_SCALAR_FIELD(grant_option);
    COMPARE_SCALAR_FIELD(behavior);

    return true;
}

static bool
_equalPrivGrantee(const PrivGrantee *a, const PrivGrantee *b)
{
    COMPARE_STRING_FIELD(rolname);

    return true;
}

static bool
_equalFuncWithArgs(const FuncWithArgs *a, const FuncWithArgs *b)
{
    COMPARE_NODE_FIELD(funcname);
    COMPARE_NODE_FIELD(funcargs);

    return true;
}

static bool
_equalAccessPriv(const AccessPriv *a, const AccessPriv *b)
{
    COMPARE_STRING_FIELD(priv_name);
    COMPARE_NODE_FIELD(cols);

    return true;
}

static bool
_equalGrantRoleStmt(const GrantRoleStmt *a, const GrantRoleStmt *b)
{
    COMPARE_NODE_FIELD(granted_roles);
    COMPARE_NODE_FIELD(grantee_roles);
    COMPARE_SCALAR_FIELD(is_grant);
    COMPARE_SCALAR_FIELD(admin_opt);
    COMPARE_STRING_FIELD(grantor);
    COMPARE_SCALAR_FIELD(behavior);

    return true;
}

static bool
_equalAlterDefaultPrivilegesStmt(const AlterDefaultPrivilegesStmt *a, const AlterDefaultPrivilegesStmt *b)
{
    COMPARE_NODE_FIELD(options);
    COMPARE_NODE_FIELD(action);

    return true;
}

static bool
_equalDeclareCursorStmt(const DeclareCursorStmt *a, const DeclareCursorStmt *b)
{
    COMPARE_STRING_FIELD(portalname);
    COMPARE_SCALAR_FIELD(options);
    COMPARE_NODE_FIELD(query);

    return true;
}

static bool
_equalClosePortalStmt(const ClosePortalStmt *a, const ClosePortalStmt *b)
{
    COMPARE_STRING_FIELD(portalname);

    return true;
}

static bool
_equalClusterStmt(const ClusterStmt *a, const ClusterStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_STRING_FIELD(indexname);
    COMPARE_SCALAR_FIELD(verbose);

    return true;
}

static bool
_equalCopyStmt(const CopyStmt *a, const CopyStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(query);
    COMPARE_NODE_FIELD(attlist);
    COMPARE_SCALAR_FIELD(is_from);
    COMPARE_SCALAR_FIELD(is_program);
    COMPARE_STRING_FIELD(filename);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalCreateStmt(const CreateStmt *a, const CreateStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(tableElts);
    COMPARE_NODE_FIELD(inhRelations);
    COMPARE_NODE_FIELD(ofTypename);
    COMPARE_NODE_FIELD(constraints);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(oncommit);
    COMPARE_STRING_FIELD(tablespacename);
    COMPARE_SCALAR_FIELD(if_not_exists);

    return true;
}

static bool
_equalTableLikeClause(const TableLikeClause *a, const TableLikeClause *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_SCALAR_FIELD(options);

    return true;
}

static bool
_equalDefineStmt(const DefineStmt *a, const DefineStmt *b)
{
    COMPARE_SCALAR_FIELD(kind);
    COMPARE_SCALAR_FIELD(oldstyle);
    COMPARE_NODE_FIELD(defnames);
    COMPARE_NODE_FIELD(args);
    COMPARE_NODE_FIELD(definition);

    return true;
}

static bool
_equalDropStmt(const DropStmt *a, const DropStmt *b)
{
    COMPARE_NODE_FIELD(objects);
    COMPARE_NODE_FIELD(arguments);
    COMPARE_SCALAR_FIELD(removeType);
    COMPARE_SCALAR_FIELD(behavior);
    COMPARE_SCALAR_FIELD(missing_ok);
    COMPARE_SCALAR_FIELD(concurrent);

    return true;
}

static bool
_equalTruncateStmt(const TruncateStmt *a, const TruncateStmt *b)
{
    COMPARE_NODE_FIELD(relations);
    COMPARE_SCALAR_FIELD(restart_seqs);
    COMPARE_SCALAR_FIELD(behavior);

    return true;
}

static bool
_equalCommentStmt(const CommentStmt *a, const CommentStmt *b)
{
    COMPARE_SCALAR_FIELD(objtype);
    COMPARE_NODE_FIELD(objname);
    COMPARE_NODE_FIELD(objargs);
    COMPARE_STRING_FIELD(comment);

    return true;
}

static bool
_equalSecLabelStmt(const SecLabelStmt *a, const SecLabelStmt *b)
{
    COMPARE_SCALAR_FIELD(objtype);
    COMPARE_NODE_FIELD(objname);
    COMPARE_NODE_FIELD(objargs);
    COMPARE_STRING_FIELD(provider);
    COMPARE_STRING_FIELD(label);

    return true;
}

static bool
_equalFetchStmt(const FetchStmt *a, const FetchStmt *b)
{
    COMPARE_SCALAR_FIELD(direction);
    COMPARE_SCALAR_FIELD(howMany);
    COMPARE_STRING_FIELD(portalname);
    COMPARE_SCALAR_FIELD(ismove);

    return true;
}

static bool
_equalIndexStmt(const IndexStmt *a, const IndexStmt *b)
{
    COMPARE_STRING_FIELD(idxname);
    COMPARE_NODE_FIELD(relation);
    COMPARE_STRING_FIELD(accessMethod);
    COMPARE_STRING_FIELD(tableSpace);
    COMPARE_NODE_FIELD(indexParams);
    COMPARE_NODE_FIELD(options);
    COMPARE_NODE_FIELD(whereClause);
    COMPARE_NODE_FIELD(excludeOpNames);
    COMPARE_STRING_FIELD(idxcomment);
    COMPARE_SCALAR_FIELD(indexOid);
    COMPARE_SCALAR_FIELD(oldNode);
    COMPARE_SCALAR_FIELD(unique);
    COMPARE_SCALAR_FIELD(primary);
    COMPARE_SCALAR_FIELD(isconstraint);
    COMPARE_SCALAR_FIELD(deferrable);
    COMPARE_SCALAR_FIELD(initdeferred);
    COMPARE_SCALAR_FIELD(concurrent);

    return true;
}

static bool
_equalCreateFunctionStmt(const CreateFunctionStmt *a, const CreateFunctionStmt *b)
{
    COMPARE_SCALAR_FIELD(replace);
    COMPARE_NODE_FIELD(funcname);
    COMPARE_NODE_FIELD(parameters);
    COMPARE_NODE_FIELD(returnType);
    COMPARE_NODE_FIELD(options);
    COMPARE_NODE_FIELD(withClause);

    return true;
}

static bool
_equalFunctionParameter(const FunctionParameter *a, const FunctionParameter *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(argType);
    COMPARE_SCALAR_FIELD(mode);
    COMPARE_NODE_FIELD(defexpr);

    return true;
}

static bool
_equalAlterFunctionStmt(const AlterFunctionStmt *a, const AlterFunctionStmt *b)
{
    COMPARE_NODE_FIELD(func);
    COMPARE_NODE_FIELD(actions);

    return true;
}

static bool
_equalDoStmt(const DoStmt *a, const DoStmt *b)
{
    COMPARE_NODE_FIELD(args);

    return true;
}

static bool
_equalRenameStmt(const RenameStmt *a, const RenameStmt *b)
{
    COMPARE_SCALAR_FIELD(renameType);
    COMPARE_SCALAR_FIELD(relationType);
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(object);
    COMPARE_NODE_FIELD(objarg);
    COMPARE_STRING_FIELD(subname);
    COMPARE_STRING_FIELD(newname);
    COMPARE_SCALAR_FIELD(behavior);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalAlterObjectSchemaStmt(const AlterObjectSchemaStmt *a, const AlterObjectSchemaStmt *b)
{
    COMPARE_SCALAR_FIELD(objectType);
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(object);
    COMPARE_NODE_FIELD(objarg);
    COMPARE_STRING_FIELD(newschema);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalAlterOwnerStmt(const AlterOwnerStmt *a, const AlterOwnerStmt *b)
{
    COMPARE_SCALAR_FIELD(objectType);
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(object);
    COMPARE_NODE_FIELD(objarg);
    COMPARE_STRING_FIELD(newowner);

    return true;
}

static bool
_equalRuleStmt(const RuleStmt *a, const RuleStmt *b)
{
    COMPARE_NODE_FIELD(relation);
    COMPARE_STRING_FIELD(rulename);
    COMPARE_NODE_FIELD(whereClause);
    COMPARE_SCALAR_FIELD(event);
    COMPARE_SCALAR_FIELD(instead);
    COMPARE_NODE_FIELD(actions);
    COMPARE_SCALAR_FIELD(replace);

    return true;
}

static bool
_equalNotifyStmt(const NotifyStmt *a, const NotifyStmt *b)
{
    COMPARE_STRING_FIELD(conditionname);
    COMPARE_STRING_FIELD(payload);

    return true;
}

static bool
_equalListenStmt(const ListenStmt *a, const ListenStmt *b)
{
    COMPARE_STRING_FIELD(conditionname);

    return true;
}

static bool
_equalUnlistenStmt(const UnlistenStmt *a, const UnlistenStmt *b)
{
    COMPARE_STRING_FIELD(conditionname);

    return true;
}

static bool
_equalTransactionStmt(const TransactionStmt *a, const TransactionStmt *b)
{
    COMPARE_SCALAR_FIELD(kind);
    COMPARE_NODE_FIELD(options);
    COMPARE_STRING_FIELD(gid);

    return true;
}

static bool
_equalCompositeTypeStmt(const CompositeTypeStmt *a, const CompositeTypeStmt *b)
{
    COMPARE_NODE_FIELD(typevar);
    COMPARE_NODE_FIELD(coldeflist);

    return true;
}

static bool
_equalCreateEnumStmt(const CreateEnumStmt *a, const CreateEnumStmt *b)
{
    COMPARE_NODE_FIELD(typeName);
    COMPARE_NODE_FIELD(vals);

    return true;
}

static bool
_equalCreateRangeStmt(const CreateRangeStmt *a, const CreateRangeStmt *b)
{
    COMPARE_NODE_FIELD(typeName);
    COMPARE_NODE_FIELD(params);

    return true;
}

static bool
_equalAlterEnumStmt(const AlterEnumStmt *a, const AlterEnumStmt *b)
{
    COMPARE_NODE_FIELD(typeName);
    COMPARE_STRING_FIELD(newVal);
    COMPARE_STRING_FIELD(newValNeighbor);
    COMPARE_SCALAR_FIELD(newValIsAfter);
    COMPARE_SCALAR_FIELD(skipIfExists);

    return true;
}

static bool
_equalViewStmt(const ViewStmt *a, const ViewStmt *b)
{
    COMPARE_NODE_FIELD(view);
    COMPARE_NODE_FIELD(aliases);
    COMPARE_NODE_FIELD(query);
    COMPARE_SCALAR_FIELD(replace);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalLoadStmt(const LoadStmt *a, const LoadStmt *b)
{
    COMPARE_STRING_FIELD(filename);

    return true;
}

static bool
_equalCreateDomainStmt(const CreateDomainStmt *a, const CreateDomainStmt *b)
{
    COMPARE_NODE_FIELD(domainname);
    COMPARE_NODE_FIELD(typeName);
    COMPARE_NODE_FIELD(collClause);
    COMPARE_NODE_FIELD(constraints);

    return true;
}

static bool
_equalCreateOpClassStmt(const CreateOpClassStmt *a, const CreateOpClassStmt *b)
{
    COMPARE_NODE_FIELD(opclassname);
    COMPARE_NODE_FIELD(opfamilyname);
    COMPARE_STRING_FIELD(amname);
    COMPARE_NODE_FIELD(datatype);
    COMPARE_NODE_FIELD(items);
    COMPARE_SCALAR_FIELD(isDefault);

    return true;
}

static bool
_equalCreateOpClassItem(const CreateOpClassItem *a, const CreateOpClassItem *b)
{
    COMPARE_SCALAR_FIELD(itemtype);
    COMPARE_NODE_FIELD(name);
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(number);
    COMPARE_NODE_FIELD(order_family);
    COMPARE_NODE_FIELD(class_args);
    COMPARE_NODE_FIELD(storedtype);

    return true;
}

static bool
_equalCreateOpFamilyStmt(const CreateOpFamilyStmt *a, const CreateOpFamilyStmt *b)
{
    COMPARE_NODE_FIELD(opfamilyname);
    COMPARE_STRING_FIELD(amname);

    return true;
}

static bool
_equalAlterOpFamilyStmt(const AlterOpFamilyStmt *a, const AlterOpFamilyStmt *b)
{
    COMPARE_NODE_FIELD(opfamilyname);
    COMPARE_STRING_FIELD(amname);
    COMPARE_SCALAR_FIELD(isDrop);
    COMPARE_NODE_FIELD(items);

    return true;
}

static bool
_equalCreatedbStmt(const CreatedbStmt *a, const CreatedbStmt *b)
{
    COMPARE_STRING_FIELD(dbname);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterDatabaseStmt(const AlterDatabaseStmt *a, const AlterDatabaseStmt *b)
{
    COMPARE_STRING_FIELD(dbname);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterDatabaseSetStmt(const AlterDatabaseSetStmt *a, const AlterDatabaseSetStmt *b)
{
    COMPARE_STRING_FIELD(dbname);
    COMPARE_NODE_FIELD(setstmt);

    return true;
}

static bool
_equalDropdbStmt(const DropdbStmt *a, const DropdbStmt *b)
{
    COMPARE_STRING_FIELD(dbname);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalVacuumStmt(const VacuumStmt *a, const VacuumStmt *b)
{
    COMPARE_SCALAR_FIELD(options);
    COMPARE_SCALAR_FIELD(freeze_min_age);
    COMPARE_SCALAR_FIELD(freeze_table_age);
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(va_cols);

    return true;
}

static bool
_equalExplainStmt(const ExplainStmt *a, const ExplainStmt *b)
{
    COMPARE_NODE_FIELD(query);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalCreateTableAsStmt(const CreateTableAsStmt *a, const CreateTableAsStmt *b)
{
    COMPARE_NODE_FIELD(query);
    COMPARE_NODE_FIELD(into);
    COMPARE_SCALAR_FIELD(relkind);
    COMPARE_SCALAR_FIELD(is_select_into);

    return true;
}

static bool
_equalRefreshMatViewStmt(const RefreshMatViewStmt *a, const RefreshMatViewStmt *b)
{
    COMPARE_SCALAR_FIELD(skipData);
    COMPARE_NODE_FIELD(relation);

    return true;
}

static bool
_equalCreateSeqStmt(const CreateSeqStmt *a, const CreateSeqStmt *b)
{
    COMPARE_NODE_FIELD(sequence);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(ownerId);

    return true;
}

static bool
_equalAlterSeqStmt(const AlterSeqStmt *a, const AlterSeqStmt *b)
{
    COMPARE_NODE_FIELD(sequence);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalVariableSetStmt(const VariableSetStmt *a, const VariableSetStmt *b)
{
    COMPARE_SCALAR_FIELD(kind);
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(is_local);

    return true;
}

static bool
_equalVariableShowStmt(const VariableShowStmt *a, const VariableShowStmt *b)
{
    COMPARE_STRING_FIELD(name);

    return true;
}

static bool
_equalDiscardStmt(const DiscardStmt *a, const DiscardStmt *b)
{
    COMPARE_SCALAR_FIELD(target);

    return true;
}

static bool
_equalCreateTableSpaceStmt(const CreateTableSpaceStmt *a, const CreateTableSpaceStmt *b)
{
    COMPARE_STRING_FIELD(tablespacename);
    COMPARE_STRING_FIELD(owner);
    COMPARE_STRING_FIELD(location);

    return true;
}

static bool
_equalDropTableSpaceStmt(const DropTableSpaceStmt *a, const DropTableSpaceStmt *b)
{
    COMPARE_STRING_FIELD(tablespacename);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalAlterTableSpaceOptionsStmt(const AlterTableSpaceOptionsStmt *a,
                                 const AlterTableSpaceOptionsStmt *b)
{
    COMPARE_STRING_FIELD(tablespacename);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(isReset);

    return true;
}

static bool
_equalCreateExtensionStmt(const CreateExtensionStmt *a, const CreateExtensionStmt *b)
{
    COMPARE_STRING_FIELD(extname);
    COMPARE_SCALAR_FIELD(if_not_exists);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterExtensionStmt(const AlterExtensionStmt *a, const AlterExtensionStmt *b)
{
    COMPARE_STRING_FIELD(extname);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterExtensionContentsStmt(const AlterExtensionContentsStmt *a, const AlterExtensionContentsStmt *b)
{
    COMPARE_STRING_FIELD(extname);
    COMPARE_SCALAR_FIELD(action);
    COMPARE_SCALAR_FIELD(objtype);
    COMPARE_NODE_FIELD(objname);
    COMPARE_NODE_FIELD(objargs);

    return true;
}

static bool
_equalCreateFdwStmt(const CreateFdwStmt *a, const CreateFdwStmt *b)
{
    COMPARE_STRING_FIELD(fdwname);
    COMPARE_NODE_FIELD(func_options);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterFdwStmt(const AlterFdwStmt *a, const AlterFdwStmt *b)
{
    COMPARE_STRING_FIELD(fdwname);
    COMPARE_NODE_FIELD(func_options);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalCreateForeignServerStmt(const CreateForeignServerStmt *a, const CreateForeignServerStmt *b)
{
    COMPARE_STRING_FIELD(servername);
    COMPARE_STRING_FIELD(servertype);
    COMPARE_STRING_FIELD(version);
    COMPARE_STRING_FIELD(fdwname);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterForeignServerStmt(const AlterForeignServerStmt *a, const AlterForeignServerStmt *b)
{
    COMPARE_STRING_FIELD(servername);
    COMPARE_STRING_FIELD(version);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(has_version);

    return true;
}

static bool
_equalCreateUserMappingStmt(const CreateUserMappingStmt *a, const CreateUserMappingStmt *b)
{
    COMPARE_STRING_FIELD(username);
    COMPARE_STRING_FIELD(servername);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterUserMappingStmt(const AlterUserMappingStmt *a, const AlterUserMappingStmt *b)
{
    COMPARE_STRING_FIELD(username);
    COMPARE_STRING_FIELD(servername);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalDropUserMappingStmt(const DropUserMappingStmt *a, const DropUserMappingStmt *b)
{
    COMPARE_STRING_FIELD(username);
    COMPARE_STRING_FIELD(servername);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalCreateForeignTableStmt(const CreateForeignTableStmt *a, const CreateForeignTableStmt *b)
{
    if (!_equalCreateStmt(&a->base, &b->base))
        return false;

    COMPARE_STRING_FIELD(servername);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalCreateTrigStmt(const CreateTrigStmt *a, const CreateTrigStmt *b)
{
    COMPARE_STRING_FIELD(trigname);
    COMPARE_NODE_FIELD(relation);
    COMPARE_NODE_FIELD(funcname);
    COMPARE_NODE_FIELD(args);
    COMPARE_SCALAR_FIELD(row);
    COMPARE_SCALAR_FIELD(timing);
    COMPARE_SCALAR_FIELD(events);
    COMPARE_NODE_FIELD(columns);
    COMPARE_NODE_FIELD(whenClause);
    COMPARE_SCALAR_FIELD(isconstraint);
    COMPARE_SCALAR_FIELD(deferrable);
    COMPARE_SCALAR_FIELD(initdeferred);
    COMPARE_NODE_FIELD(constrrel);

    return true;
}

static bool
_equalCreateEventTrigStmt(const CreateEventTrigStmt *a, const CreateEventTrigStmt *b)
{
    COMPARE_STRING_FIELD(trigname);
    COMPARE_SCALAR_FIELD(eventname);
    COMPARE_NODE_FIELD(funcname);
    COMPARE_NODE_FIELD(whenclause);

    return true;
}

static bool
_equalAlterEventTrigStmt(const AlterEventTrigStmt *a, const AlterEventTrigStmt *b)
{
    COMPARE_STRING_FIELD(trigname);
    COMPARE_SCALAR_FIELD(tgenabled);

    return true;
}

static bool
_equalCreatePLangStmt(const CreatePLangStmt *a, const CreatePLangStmt *b)
{
    COMPARE_SCALAR_FIELD(replace);
    COMPARE_STRING_FIELD(plname);
    COMPARE_NODE_FIELD(plhandler);
    COMPARE_NODE_FIELD(plinline);
    COMPARE_NODE_FIELD(plvalidator);
    COMPARE_SCALAR_FIELD(pltrusted);

    return true;
}

static bool
_equalCreateRoleStmt(const CreateRoleStmt *a, const CreateRoleStmt *b)
{
    COMPARE_SCALAR_FIELD(stmt_type);
    COMPARE_STRING_FIELD(role);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterRoleStmt(const AlterRoleStmt *a, const AlterRoleStmt *b)
{
    COMPARE_STRING_FIELD(role);
    COMPARE_NODE_FIELD(options);
    COMPARE_SCALAR_FIELD(action);

    return true;
}

static bool
_equalAlterRoleSetStmt(const AlterRoleSetStmt *a, const AlterRoleSetStmt *b)
{
    COMPARE_STRING_FIELD(role);
    COMPARE_STRING_FIELD(database);
    COMPARE_NODE_FIELD(setstmt);

    return true;
}

static bool
_equalDropRoleStmt(const DropRoleStmt *a, const DropRoleStmt *b)
{
    COMPARE_NODE_FIELD(roles);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalLockStmt(const LockStmt *a, const LockStmt *b)
{
    COMPARE_NODE_FIELD(relations);
    COMPARE_SCALAR_FIELD(mode);
    COMPARE_SCALAR_FIELD(nowait);

    return true;
}

static bool
_equalConstraintsSetStmt(const ConstraintsSetStmt *a, const ConstraintsSetStmt *b)
{
    COMPARE_NODE_FIELD(constraints);
    COMPARE_SCALAR_FIELD(deferred);

    return true;
}

static bool
_equalReindexStmt(const ReindexStmt *a, const ReindexStmt *b)
{
    COMPARE_SCALAR_FIELD(kind);
    COMPARE_NODE_FIELD(relation);
    COMPARE_STRING_FIELD(name);
    COMPARE_SCALAR_FIELD(do_system);
    COMPARE_SCALAR_FIELD(do_user);

    return true;
}

static bool
_equalCreateSchemaStmt(const CreateSchemaStmt *a, const CreateSchemaStmt *b)
{
    COMPARE_STRING_FIELD(schemaname);
    COMPARE_STRING_FIELD(authid);
    COMPARE_NODE_FIELD(schemaElts);
    COMPARE_SCALAR_FIELD(if_not_exists);

    return true;
}

static bool
_equalCreateConversionStmt(const CreateConversionStmt *a, const CreateConversionStmt *b)
{
    COMPARE_NODE_FIELD(conversion_name);
    COMPARE_STRING_FIELD(for_encoding_name);
    COMPARE_STRING_FIELD(to_encoding_name);
    COMPARE_NODE_FIELD(func_name);
    COMPARE_SCALAR_FIELD(def);

    return true;
}

static bool
_equalCreateCastStmt(const CreateCastStmt *a, const CreateCastStmt *b)
{
    COMPARE_NODE_FIELD(sourcetype);
    COMPARE_NODE_FIELD(targettype);
    COMPARE_NODE_FIELD(func);
    COMPARE_SCALAR_FIELD(context);
    COMPARE_SCALAR_FIELD(inout);

    return true;
}

static bool
_equalPrepareStmt(const PrepareStmt *a, const PrepareStmt *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(argtypes);
    COMPARE_NODE_FIELD(query);

    return true;
}

static bool
_equalExecuteStmt(const ExecuteStmt *a, const ExecuteStmt *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(params);

    return true;
}

static bool
_equalDeallocateStmt(const DeallocateStmt *a, const DeallocateStmt *b)
{
    COMPARE_STRING_FIELD(name);

    return true;
}

static bool
_equalDropOwnedStmt(const DropOwnedStmt *a, const DropOwnedStmt *b)
{
    COMPARE_NODE_FIELD(roles);
    COMPARE_SCALAR_FIELD(behavior);

    return true;
}

static bool
_equalReassignOwnedStmt(const ReassignOwnedStmt *a, const ReassignOwnedStmt *b)
{
    COMPARE_NODE_FIELD(roles);
    COMPARE_STRING_FIELD(newrole);

    return true;
}

static bool
_equalAlterTSDictionaryStmt(const AlterTSDictionaryStmt *a, const AlterTSDictionaryStmt *b)
{
    COMPARE_NODE_FIELD(dictname);
    COMPARE_NODE_FIELD(options);

    return true;
}

static bool
_equalAlterTSConfigurationStmt(const AlterTSConfigurationStmt *a,
                               const AlterTSConfigurationStmt *b)
{
    COMPARE_NODE_FIELD(cfgname);
    COMPARE_NODE_FIELD(tokentype);
    COMPARE_NODE_FIELD(dicts);
    COMPARE_SCALAR_FIELD(override);
    COMPARE_SCALAR_FIELD(replace);
    COMPARE_SCALAR_FIELD(missing_ok);

    return true;
}

static bool
_equalAExpr(const A_Expr *a, const A_Expr *b)
{
    COMPARE_SCALAR_FIELD(kind);
    COMPARE_NODE_FIELD(name);
    COMPARE_NODE_FIELD(lexpr);
    COMPARE_NODE_FIELD(rexpr);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalColumnRef(const ColumnRef *a, const ColumnRef *b)
{
    COMPARE_NODE_FIELD(fields);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalParamRef(const ParamRef *a, const ParamRef *b)
{
    COMPARE_SCALAR_FIELD(number);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalAConst(const A_Const *a, const A_Const *b)
{
    if (!equal(&a->val, &b->val))       /* hack for in-line Value field */
        return false;
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalFuncCall(const FuncCall *a, const FuncCall *b)
{
    COMPARE_NODE_FIELD(funcname);
    COMPARE_NODE_FIELD(args);
    COMPARE_NODE_FIELD(agg_order);
    COMPARE_SCALAR_FIELD(agg_star);
    COMPARE_SCALAR_FIELD(agg_distinct);
    COMPARE_SCALAR_FIELD(func_variadic);
    COMPARE_NODE_FIELD(over);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalAStar(const A_Star *a, const A_Star *b)
{
    return true;
}

static bool
_equalAIndices(const A_Indices *a, const A_Indices *b)
{
    COMPARE_NODE_FIELD(lidx);
    COMPARE_NODE_FIELD(uidx);

    return true;
}

static bool
_equalA_Indirection(const A_Indirection *a, const A_Indirection *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_NODE_FIELD(indirection);

    return true;
}

static bool
_equalA_ArrayExpr(const A_ArrayExpr *a, const A_ArrayExpr *b)
{
    COMPARE_NODE_FIELD(elements);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalResTarget(const ResTarget *a, const ResTarget *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(indirection);
    COMPARE_NODE_FIELD(val);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalTypeName(const TypeName *a, const TypeName *b)
{
    COMPARE_NODE_FIELD(names);
    COMPARE_SCALAR_FIELD(typeOid);
    COMPARE_SCALAR_FIELD(setof);
    COMPARE_SCALAR_FIELD(pct_type);
    COMPARE_NODE_FIELD(typmods);
    COMPARE_SCALAR_FIELD(typemod);
    COMPARE_NODE_FIELD(arrayBounds);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalTypeCast(const TypeCast *a, const TypeCast *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_NODE_FIELD(typeName);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCollateClause(const CollateClause *a, const CollateClause *b)
{
    COMPARE_NODE_FIELD(arg);
    COMPARE_NODE_FIELD(collname);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalSortBy(const SortBy *a, const SortBy *b)
{
    COMPARE_NODE_FIELD(node);
    COMPARE_SCALAR_FIELD(sortby_dir);
    COMPARE_SCALAR_FIELD(sortby_nulls);
    COMPARE_NODE_FIELD(useOp);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalWindowDef(const WindowDef *a, const WindowDef *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_STRING_FIELD(refname);
    COMPARE_NODE_FIELD(partitionClause);
    COMPARE_NODE_FIELD(orderClause);
    COMPARE_SCALAR_FIELD(frameOptions);
    COMPARE_NODE_FIELD(startOffset);
    COMPARE_NODE_FIELD(endOffset);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalRangeSubselect(const RangeSubselect *a, const RangeSubselect *b)
{
    COMPARE_SCALAR_FIELD(lateral);
    COMPARE_NODE_FIELD(subquery);
    COMPARE_NODE_FIELD(alias);

    return true;
}

static bool
_equalRangeFunction(const RangeFunction *a, const RangeFunction *b)
{
    COMPARE_SCALAR_FIELD(lateral);
    COMPARE_NODE_FIELD(funccallnode);
    COMPARE_NODE_FIELD(alias);
    COMPARE_NODE_FIELD(coldeflist);

    return true;
}

static bool
_equalIndexElem(const IndexElem *a, const IndexElem *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_NODE_FIELD(expr);
    COMPARE_STRING_FIELD(indexcolname);
    COMPARE_NODE_FIELD(collation);
    COMPARE_NODE_FIELD(opclass);
    COMPARE_SCALAR_FIELD(ordering);
    COMPARE_SCALAR_FIELD(nulls_ordering);

    return true;
}

static bool
_equalColumnDef(const ColumnDef *a, const ColumnDef *b)
{
    COMPARE_STRING_FIELD(colname);
    COMPARE_NODE_FIELD(typeName);
    COMPARE_SCALAR_FIELD(inhcount);
    COMPARE_SCALAR_FIELD(is_local);
    COMPARE_SCALAR_FIELD(is_not_null);
    COMPARE_SCALAR_FIELD(is_from_type);
    COMPARE_SCALAR_FIELD(storage);
    COMPARE_NODE_FIELD(raw_default);
    COMPARE_NODE_FIELD(cooked_default);
    COMPARE_NODE_FIELD(collClause);
    COMPARE_SCALAR_FIELD(collOid);
    COMPARE_NODE_FIELD(constraints);
    COMPARE_NODE_FIELD(fdwoptions);

    return true;
}

static bool
_equalConstraint(const Constraint *a, const Constraint *b)
{
    COMPARE_SCALAR_FIELD(contype);
    COMPARE_STRING_FIELD(conname);
    COMPARE_SCALAR_FIELD(deferrable);
    COMPARE_SCALAR_FIELD(initdeferred);
    COMPARE_LOCATION_FIELD(location);
    COMPARE_SCALAR_FIELD(is_no_inherit);
    COMPARE_NODE_FIELD(raw_expr);
    COMPARE_STRING_FIELD(cooked_expr);
    COMPARE_NODE_FIELD(keys);
    COMPARE_NODE_FIELD(exclusions);
    COMPARE_NODE_FIELD(options);
    COMPARE_STRING_FIELD(indexname);
    COMPARE_STRING_FIELD(indexspace);
    COMPARE_STRING_FIELD(access_method);
    COMPARE_NODE_FIELD(where_clause);
    COMPARE_NODE_FIELD(pktable);
    COMPARE_NODE_FIELD(fk_attrs);
    COMPARE_NODE_FIELD(pk_attrs);
    COMPARE_SCALAR_FIELD(fk_matchtype);
    COMPARE_SCALAR_FIELD(fk_upd_action);
    COMPARE_SCALAR_FIELD(fk_del_action);
    COMPARE_NODE_FIELD(old_conpfeqop);
    COMPARE_SCALAR_FIELD(skip_validation);
    COMPARE_SCALAR_FIELD(initially_valid);

    return true;
}

static bool
_equalDefElem(const DefElem *a, const DefElem *b)
{
    COMPARE_STRING_FIELD(defnamespace);
    COMPARE_STRING_FIELD(defname);
    COMPARE_NODE_FIELD(arg);
    COMPARE_SCALAR_FIELD(defaction);

    return true;
}

static bool
_equalLockingClause(const LockingClause *a, const LockingClause *b)
{
    COMPARE_NODE_FIELD(lockedRels);
    COMPARE_SCALAR_FIELD(strength);
    COMPARE_SCALAR_FIELD(noWait);

    return true;
}

static bool
_equalRangeTblEntry(const RangeTblEntry *a, const RangeTblEntry *b)
{
    COMPARE_SCALAR_FIELD(rtekind);
    COMPARE_SCALAR_FIELD(relid);
    COMPARE_SCALAR_FIELD(relkind);
    COMPARE_NODE_FIELD(subquery);
    COMPARE_SCALAR_FIELD(security_barrier);
    COMPARE_SCALAR_FIELD(jointype);
    COMPARE_NODE_FIELD(joinaliasvars);
    COMPARE_NODE_FIELD(funcexpr);
    COMPARE_NODE_FIELD(funccoltypes);
    COMPARE_NODE_FIELD(funccoltypmods);
    COMPARE_NODE_FIELD(funccolcollations);
    COMPARE_NODE_FIELD(values_lists);
    COMPARE_NODE_FIELD(values_collations);
    COMPARE_STRING_FIELD(ctename);
    COMPARE_SCALAR_FIELD(ctelevelsup);
    COMPARE_SCALAR_FIELD(self_reference);
    COMPARE_NODE_FIELD(ctecoltypes);
    COMPARE_NODE_FIELD(ctecoltypmods);
    COMPARE_NODE_FIELD(ctecolcollations);
    COMPARE_NODE_FIELD(alias);
    COMPARE_NODE_FIELD(eref);
    COMPARE_SCALAR_FIELD(lateral);
    COMPARE_SCALAR_FIELD(inh);
    COMPARE_SCALAR_FIELD(inFromCl);
    COMPARE_SCALAR_FIELD(requiredPerms);
    COMPARE_SCALAR_FIELD(checkAsUser);
    COMPARE_BITMAPSET_FIELD(selectedCols);
    COMPARE_BITMAPSET_FIELD(modifiedCols);

    return true;
}

static bool
_equalSortGroupClause(const SortGroupClause *a, const SortGroupClause *b)
{
    COMPARE_SCALAR_FIELD(tleSortGroupRef);
    COMPARE_SCALAR_FIELD(eqop);
    COMPARE_SCALAR_FIELD(sortop);
    COMPARE_SCALAR_FIELD(nulls_first);
    COMPARE_SCALAR_FIELD(hashable);

    return true;
}

static bool
_equalWindowClause(const WindowClause *a, const WindowClause *b)
{
    COMPARE_STRING_FIELD(name);
    COMPARE_STRING_FIELD(refname);
    COMPARE_NODE_FIELD(partitionClause);
    COMPARE_NODE_FIELD(orderClause);
    COMPARE_SCALAR_FIELD(frameOptions);
    COMPARE_NODE_FIELD(startOffset);
    COMPARE_NODE_FIELD(endOffset);
    COMPARE_SCALAR_FIELD(winref);
    COMPARE_SCALAR_FIELD(copiedOrder);

    return true;
}

static bool
_equalRowMarkClause(const RowMarkClause *a, const RowMarkClause *b)
{
    COMPARE_SCALAR_FIELD(rti);
    COMPARE_SCALAR_FIELD(strength);
    COMPARE_SCALAR_FIELD(noWait);
    COMPARE_SCALAR_FIELD(pushedDown);

    return true;
}

static bool
_equalWithClause(const WithClause *a, const WithClause *b)
{
    COMPARE_NODE_FIELD(ctes);
    COMPARE_SCALAR_FIELD(recursive);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

static bool
_equalCommonTableExpr(const CommonTableExpr *a, const CommonTableExpr *b)
{
    COMPARE_STRING_FIELD(ctename);
    COMPARE_NODE_FIELD(aliascolnames);
    COMPARE_NODE_FIELD(ctequery);
    COMPARE_LOCATION_FIELD(location);
    COMPARE_SCALAR_FIELD(cterecursive);
    COMPARE_SCALAR_FIELD(cterefcount);
    COMPARE_NODE_FIELD(ctecolnames);
    COMPARE_NODE_FIELD(ctecoltypes);
    COMPARE_NODE_FIELD(ctecoltypmods);
    COMPARE_NODE_FIELD(ctecolcollations);

    return true;
}

static bool
_equalXmlSerialize(const XmlSerialize *a, const XmlSerialize *b)
{
    COMPARE_SCALAR_FIELD(xmloption);
    COMPARE_NODE_FIELD(expr);
    COMPARE_NODE_FIELD(typeName);
    COMPARE_LOCATION_FIELD(location);

    return true;
}

/*
 * Stuff from pg_list.h
 */

static bool
_equalList(const List *a, const List *b)
{
    const ListCell *item_a;
    const ListCell *item_b;

    /*
     * Try to reject by simple scalar checks before grovelling through all the
     * list elements...
     */
    COMPARE_SCALAR_FIELD(type);
    COMPARE_SCALAR_FIELD(length);

    /*
     * We place the switch outside the loop for the sake of efficiency; this
     * may not be worth doing...
     */
    switch (a->type)
    {
        case T_List:
            forboth(item_a, a, item_b, b)
            {
                if (!equal(lfirst(item_a), lfirst(item_b)))
                    return false;
            }
            break;
        case T_IntList:
            forboth(item_a, a, item_b, b)
            {
                if (lfirst_int(item_a) != lfirst_int(item_b))
                    return false;
            }
            break;
        case T_OidList:
            forboth(item_a, a, item_b, b)
            {
                if (lfirst_oid(item_a) != lfirst_oid(item_b))
                    return false;
            }
            break;
        default:
            elog(ERROR, "unrecognized list node type: %d",
                 (int) a->type);
            return false;       /* keep compiler quiet */
    }

    /*
     * If we got here, we should have run out of elements of both lists
     */
    Assert(item_a == NULL);
    Assert(item_b == NULL);

    return true;
}

/*
 * Stuff from value.h
 */

static bool
_equalValue(const Value *a, const Value *b)
{
    COMPARE_SCALAR_FIELD(type);

    switch (a->type)
    {
        case T_Integer:
            COMPARE_SCALAR_FIELD(val.ival);
            break;
        case T_Float:
        case T_String:
        case T_BitString:
            COMPARE_STRING_FIELD(val.str);
            break;
        case T_Null:
            /* nothing to do */
            break;
        default:
            elog(ERROR, "unrecognized node type: %d", (int) a->type);
            break;
    }

    return true;
}

/*
 * equal
 *    returns whether two nodes are equal
 */
bool
equal(const void *a, const void *b)
{
    bool        retval;

    if (a == b)
        return true;

    /*
     * note that a!=b, so only one of them can be NULL
     */
    if (a == NULL || b == NULL)
        return false;

    /*
     * are they the same type of nodes?
     */
    if (nodeTag(a) != nodeTag(b))
        return false;

    switch (nodeTag(a))
    {
            /*
             * PRIMITIVE NODES
             */
        case T_Alias:
            retval = _equalAlias(a, b);
            break;
        case T_RangeVar:
            retval = _equalRangeVar(a, b);
            break;
        case T_IntoClause:
            retval = _equalIntoClause(a, b);
            break;
        case T_Var:
            retval = _equalVar(a, b);
            break;
        case T_Const:
            retval = _equalConst(a, b);
            break;
        case T_Param:
            retval = _equalParam(a, b);
            break;
        case T_Aggref:
            retval = _equalAggref(a, b);
            break;
        case T_WindowFunc:
            retval = _equalWindowFunc(a, b);
            break;
        case T_ArrayRef:
            retval = _equalArrayRef(a, b);
            break;
        case T_FuncExpr:
            retval = _equalFuncExpr(a, b);
            break;
        case T_NamedArgExpr:
            retval = _equalNamedArgExpr(a, b);
            break;
        case T_OpExpr:
            retval = _equalOpExpr(a, b);
            break;
        case T_DistinctExpr:
            retval = _equalDistinctExpr(a, b);
            break;
        case T_NullIfExpr:
            retval = _equalNullIfExpr(a, b);
            break;
        case T_ScalarArrayOpExpr:
            retval = _equalScalarArrayOpExpr(a, b);
            break;
        case T_BoolExpr:
            retval = _equalBoolExpr(a, b);
            break;
        case T_SubLink:
            retval = _equalSubLink(a, b);
            break;
        case T_SubPlan:
            retval = _equalSubPlan(a, b);
            break;
        case T_AlternativeSubPlan:
            retval = _equalAlternativeSubPlan(a, b);
            break;
        case T_FieldSelect:
            retval = _equalFieldSelect(a, b);
            break;
        case T_FieldStore:
            retval = _equalFieldStore(a, b);
            break;
        case T_RelabelType:
            retval = _equalRelabelType(a, b);
            break;
        case T_CoerceViaIO:
            retval = _equalCoerceViaIO(a, b);
            break;
        case T_ArrayCoerceExpr:
            retval = _equalArrayCoerceExpr(a, b);
            break;
        case T_ConvertRowtypeExpr:
            retval = _equalConvertRowtypeExpr(a, b);
            break;
        case T_CollateExpr:
            retval = _equalCollateExpr(a, b);
            break;
        case T_CaseExpr:
            retval = _equalCaseExpr(a, b);
            break;
        case T_CaseWhen:
            retval = _equalCaseWhen(a, b);
            break;
        case T_CaseTestExpr:
            retval = _equalCaseTestExpr(a, b);
            break;
        case T_ArrayExpr:
            retval = _equalArrayExpr(a, b);
            break;
        case T_RowExpr:
            retval = _equalRowExpr(a, b);
            break;
        case T_RowCompareExpr:
            retval = _equalRowCompareExpr(a, b);
            break;
        case T_CoalesceExpr:
            retval = _equalCoalesceExpr(a, b);
            break;
        case T_MinMaxExpr:
            retval = _equalMinMaxExpr(a, b);
            break;
        case T_XmlExpr:
            retval = _equalXmlExpr(a, b);
            break;
        case T_NullTest:
            retval = _equalNullTest(a, b);
            break;
        case T_BooleanTest:
            retval = _equalBooleanTest(a, b);
            break;
        case T_CoerceToDomain:
            retval = _equalCoerceToDomain(a, b);
            break;
        case T_CoerceToDomainValue:
            retval = _equalCoerceToDomainValue(a, b);
            break;
        case T_SetToDefault:
            retval = _equalSetToDefault(a, b);
            break;
        case T_CurrentOfExpr:
            retval = _equalCurrentOfExpr(a, b);
            break;
        case T_TargetEntry:
            retval = _equalTargetEntry(a, b);
            break;
        case T_RangeTblRef:
            retval = _equalRangeTblRef(a, b);
            break;
        case T_FromExpr:
            retval = _equalFromExpr(a, b);
            break;
        case T_JoinExpr:
            retval = _equalJoinExpr(a, b);
            break;

            /*
             * RELATION NODES
             */
        case T_PathKey:
            retval = _equalPathKey(a, b);
            break;
        case T_RestrictInfo:
            retval = _equalRestrictInfo(a, b);
            break;
        case T_PlaceHolderVar:
            retval = _equalPlaceHolderVar(a, b);
            break;
        case T_SpecialJoinInfo:
            retval = _equalSpecialJoinInfo(a, b);
            break;
        case T_LateralJoinInfo:
            retval = _equalLateralJoinInfo(a, b);
            break;
        case T_AppendRelInfo:
            retval = _equalAppendRelInfo(a, b);
            break;
        case T_PlaceHolderInfo:
            retval = _equalPlaceHolderInfo(a, b);
            break;

        case T_List:
        case T_IntList:
        case T_OidList:
            retval = _equalList(a, b);
            break;

        case T_Integer:
        case T_Float:
        case T_String:
        case T_BitString:
        case T_Null:
            retval = _equalValue(a, b);
            break;

            /*
             * PARSE NODES
             */
        case T_Query:
            retval = _equalQuery(a, b);
            break;
        case T_InsertStmt:
            retval = _equalInsertStmt(a, b);
            break;
        case T_DeleteStmt:
            retval = _equalDeleteStmt(a, b);
            break;
        case T_UpdateStmt:
            retval = _equalUpdateStmt(a, b);
            break;
        case T_SelectStmt:
            retval = _equalSelectStmt(a, b);
            break;
        case T_SetOperationStmt:
            retval = _equalSetOperationStmt(a, b);
            break;
        case T_AlterTableStmt:
            retval = _equalAlterTableStmt(a, b);
            break;
        case T_AlterTableCmd:
            retval = _equalAlterTableCmd(a, b);
            break;
        case T_AlterDomainStmt:
            retval = _equalAlterDomainStmt(a, b);
            break;
        case T_GrantStmt:
            retval = _equalGrantStmt(a, b);
            break;
        case T_GrantRoleStmt:
            retval = _equalGrantRoleStmt(a, b);
            break;
        case T_AlterDefaultPrivilegesStmt:
            retval = _equalAlterDefaultPrivilegesStmt(a, b);
            break;
        case T_DeclareCursorStmt:
            retval = _equalDeclareCursorStmt(a, b);
            break;
        case T_ClosePortalStmt:
            retval = _equalClosePortalStmt(a, b);
            break;
        case T_ClusterStmt:
            retval = _equalClusterStmt(a, b);
            break;
        case T_CopyStmt:
            retval = _equalCopyStmt(a, b);
            break;
        case T_CreateStmt:
            retval = _equalCreateStmt(a, b);
            break;
        case T_TableLikeClause:
            retval = _equalTableLikeClause(a, b);
            break;
        case T_DefineStmt:
            retval = _equalDefineStmt(a, b);
            break;
        case T_DropStmt:
            retval = _equalDropStmt(a, b);
            break;
        case T_TruncateStmt:
            retval = _equalTruncateStmt(a, b);
            break;
        case T_CommentStmt:
            retval = _equalCommentStmt(a, b);
            break;
        case T_SecLabelStmt:
            retval = _equalSecLabelStmt(a, b);
            break;
        case T_FetchStmt:
            retval = _equalFetchStmt(a, b);
            break;
        case T_IndexStmt:
            retval = _equalIndexStmt(a, b);
            break;
        case T_CreateFunctionStmt:
            retval = _equalCreateFunctionStmt(a, b);
            break;
        case T_FunctionParameter:
            retval = _equalFunctionParameter(a, b);
            break;
        case T_AlterFunctionStmt:
            retval = _equalAlterFunctionStmt(a, b);
            break;
        case T_DoStmt:
            retval = _equalDoStmt(a, b);
            break;
        case T_RenameStmt:
            retval = _equalRenameStmt(a, b);
            break;
        case T_AlterObjectSchemaStmt:
            retval = _equalAlterObjectSchemaStmt(a, b);
            break;
        case T_AlterOwnerStmt:
            retval = _equalAlterOwnerStmt(a, b);
            break;
        case T_RuleStmt:
            retval = _equalRuleStmt(a, b);
            break;
        case T_NotifyStmt:
            retval = _equalNotifyStmt(a, b);
            break;
        case T_ListenStmt:
            retval = _equalListenStmt(a, b);
            break;
        case T_UnlistenStmt:
            retval = _equalUnlistenStmt(a, b);
            break;
        case T_TransactionStmt:
            retval = _equalTransactionStmt(a, b);
            break;
        case T_CompositeTypeStmt:
            retval = _equalCompositeTypeStmt(a, b);
            break;
        case T_CreateEnumStmt:
            retval = _equalCreateEnumStmt(a, b);
            break;
        case T_CreateRangeStmt:
            retval = _equalCreateRangeStmt(a, b);
            break;
        case T_AlterEnumStmt:
            retval = _equalAlterEnumStmt(a, b);
            break;
        case T_ViewStmt:
            retval = _equalViewStmt(a, b);
            break;
        case T_LoadStmt:
            retval = _equalLoadStmt(a, b);
            break;
        case T_CreateDomainStmt:
            retval = _equalCreateDomainStmt(a, b);
            break;
        case T_CreateOpClassStmt:
            retval = _equalCreateOpClassStmt(a, b);
            break;
        case T_CreateOpClassItem:
            retval = _equalCreateOpClassItem(a, b);
            break;
        case T_CreateOpFamilyStmt:
            retval = _equalCreateOpFamilyStmt(a, b);
            break;
        case T_AlterOpFamilyStmt:
            retval = _equalAlterOpFamilyStmt(a, b);
            break;
        case T_CreatedbStmt:
            retval = _equalCreatedbStmt(a, b);
            break;
        case T_AlterDatabaseStmt:
            retval = _equalAlterDatabaseStmt(a, b);
            break;
        case T_AlterDatabaseSetStmt:
            retval = _equalAlterDatabaseSetStmt(a, b);
            break;
        case T_DropdbStmt:
            retval = _equalDropdbStmt(a, b);
            break;
        case T_VacuumStmt:
            retval = _equalVacuumStmt(a, b);
            break;
        case T_ExplainStmt:
            retval = _equalExplainStmt(a, b);
            break;
        case T_CreateTableAsStmt:
            retval = _equalCreateTableAsStmt(a, b);
            break;
        case T_RefreshMatViewStmt:
            retval = _equalRefreshMatViewStmt(a, b);
            break;
        case T_CreateSeqStmt:
            retval = _equalCreateSeqStmt(a, b);
            break;
        case T_AlterSeqStmt:
            retval = _equalAlterSeqStmt(a, b);
            break;
        case T_VariableSetStmt:
            retval = _equalVariableSetStmt(a, b);
            break;
        case T_VariableShowStmt:
            retval = _equalVariableShowStmt(a, b);
            break;
        case T_DiscardStmt:
            retval = _equalDiscardStmt(a, b);
            break;
        case T_CreateTableSpaceStmt:
            retval = _equalCreateTableSpaceStmt(a, b);
            break;
        case T_DropTableSpaceStmt:
            retval = _equalDropTableSpaceStmt(a, b);
            break;
        case T_AlterTableSpaceOptionsStmt:
            retval = _equalAlterTableSpaceOptionsStmt(a, b);
            break;
        case T_CreateExtensionStmt:
            retval = _equalCreateExtensionStmt(a, b);
            break;
        case T_AlterExtensionStmt:
            retval = _equalAlterExtensionStmt(a, b);
            break;
        case T_AlterExtensionContentsStmt:
            retval = _equalAlterExtensionContentsStmt(a, b);
            break;
        case T_CreateFdwStmt:
            retval = _equalCreateFdwStmt(a, b);
            break;
        case T_AlterFdwStmt:
            retval = _equalAlterFdwStmt(a, b);
            break;
        case T_CreateForeignServerStmt:
            retval = _equalCreateForeignServerStmt(a, b);
            break;
        case T_AlterForeignServerStmt:
            retval = _equalAlterForeignServerStmt(a, b);
            break;
        case T_CreateUserMappingStmt:
            retval = _equalCreateUserMappingStmt(a, b);
            break;
        case T_AlterUserMappingStmt:
            retval = _equalAlterUserMappingStmt(a, b);
            break;
        case T_DropUserMappingStmt:
            retval = _equalDropUserMappingStmt(a, b);
            break;
        case T_CreateForeignTableStmt:
            retval = _equalCreateForeignTableStmt(a, b);
            break;
        case T_CreateTrigStmt:
            retval = _equalCreateTrigStmt(a, b);
            break;
        case T_CreateEventTrigStmt:
            retval = _equalCreateEventTrigStmt(a, b);
            break;
        case T_AlterEventTrigStmt:
            retval = _equalAlterEventTrigStmt(a, b);
            break;
        case T_CreatePLangStmt:
            retval = _equalCreatePLangStmt(a, b);
            break;
        case T_CreateRoleStmt:
            retval = _equalCreateRoleStmt(a, b);
            break;
        case T_AlterRoleStmt:
            retval = _equalAlterRoleStmt(a, b);
            break;
        case T_AlterRoleSetStmt:
            retval = _equalAlterRoleSetStmt(a, b);
            break;
        case T_DropRoleStmt:
            retval = _equalDropRoleStmt(a, b);
            break;
        case T_LockStmt:
            retval = _equalLockStmt(a, b);
            break;
        case T_ConstraintsSetStmt:
            retval = _equalConstraintsSetStmt(a, b);
            break;
        case T_ReindexStmt:
            retval = _equalReindexStmt(a, b);
            break;
        case T_CheckPointStmt:
            retval = true;
            break;
        case T_CreateSchemaStmt:
            retval = _equalCreateSchemaStmt(a, b);
            break;
        case T_CreateConversionStmt:
            retval = _equalCreateConversionStmt(a, b);
            break;
        case T_CreateCastStmt:
            retval = _equalCreateCastStmt(a, b);
            break;
        case T_PrepareStmt:
            retval = _equalPrepareStmt(a, b);
            break;
        case T_ExecuteStmt:
            retval = _equalExecuteStmt(a, b);
            break;
        case T_DeallocateStmt:
            retval = _equalDeallocateStmt(a, b);
            break;
        case T_DropOwnedStmt:
            retval = _equalDropOwnedStmt(a, b);
            break;
        case T_ReassignOwnedStmt:
            retval = _equalReassignOwnedStmt(a, b);
            break;
        case T_AlterTSDictionaryStmt:
            retval = _equalAlterTSDictionaryStmt(a, b);
            break;
        case T_AlterTSConfigurationStmt:
            retval = _equalAlterTSConfigurationStmt(a, b);
            break;

        case T_A_Expr:
            retval = _equalAExpr(a, b);
            break;
        case T_ColumnRef:
            retval = _equalColumnRef(a, b);
            break;
        case T_ParamRef:
            retval = _equalParamRef(a, b);
            break;
        case T_A_Const:
            retval = _equalAConst(a, b);
            break;
        case T_FuncCall:
            retval = _equalFuncCall(a, b);
            break;
        case T_A_Star:
            retval = _equalAStar(a, b);
            break;
        case T_A_Indices:
            retval = _equalAIndices(a, b);
            break;
        case T_A_Indirection:
            retval = _equalA_Indirection(a, b);
            break;
        case T_A_ArrayExpr:
            retval = _equalA_ArrayExpr(a, b);
            break;
        case T_ResTarget:
            retval = _equalResTarget(a, b);
            break;
        case T_TypeCast:
            retval = _equalTypeCast(a, b);
            break;
        case T_CollateClause:
            retval = _equalCollateClause(a, b);
            break;
        case T_SortBy:
            retval = _equalSortBy(a, b);
            break;
        case T_WindowDef:
            retval = _equalWindowDef(a, b);
            break;
        case T_RangeSubselect:
            retval = _equalRangeSubselect(a, b);
            break;
        case T_RangeFunction:
            retval = _equalRangeFunction(a, b);
            break;
        case T_TypeName:
            retval = _equalTypeName(a, b);
            break;
        case T_IndexElem:
            retval = _equalIndexElem(a, b);
            break;
        case T_ColumnDef:
            retval = _equalColumnDef(a, b);
            break;
        case T_Constraint:
            retval = _equalConstraint(a, b);
            break;
        case T_DefElem:
            retval = _equalDefElem(a, b);
            break;
        case T_LockingClause:
            retval = _equalLockingClause(a, b);
            break;
        case T_RangeTblEntry:
            retval = _equalRangeTblEntry(a, b);
            break;
        case T_SortGroupClause:
            retval = _equalSortGroupClause(a, b);
            break;
        case T_WindowClause:
            retval = _equalWindowClause(a, b);
            break;
        case T_RowMarkClause:
            retval = _equalRowMarkClause(a, b);
            break;
        case T_WithClause:
            retval = _equalWithClause(a, b);
            break;
        case T_CommonTableExpr:
            retval = _equalCommonTableExpr(a, b);
            break;
        case T_PrivGrantee:
            retval = _equalPrivGrantee(a, b);
            break;
        case T_FuncWithArgs:
            retval = _equalFuncWithArgs(a, b);
            break;
        case T_AccessPriv:
            retval = _equalAccessPriv(a, b);
            break;
        case T_XmlSerialize:
            retval = _equalXmlSerialize(a, b);
            break;

        default:
            elog(ERROR, "unrecognized node type: %d",
                 (int) nodeTag(a));
            retval = false;     /* keep compiler quiet */
            break;
    }

    return retval;
}