Header And Logo
|
#include "postgres.h"#include "catalog/pg_type.h"#include "commands/dbcommands.h"#include "funcapi.h"#include "miscadmin.h"#include "nodes/makefuncs.h"#include "nodes/nodeFuncs.h"#include "parser/parsetree.h"#include "parser/parse_coerce.h"#include "parser/parse_expr.h"#include "parser/parse_func.h"#include "parser/parse_relation.h"#include "parser/parse_target.h"#include "parser/parse_type.h"#include "utils/builtins.h"#include "utils/lsyscache.h"#include "utils/rel.h"#include "utils/typcache.h"
Go to the source code of this file.
Functions | |
| static void | markTargetListOrigin (ParseState *pstate, TargetEntry *tle, Var *var, int levelsup) |
| static Node * | transformAssignmentIndirection (ParseState *pstate, Node *basenode, const char *targetName, bool targetIsArray, Oid targetTypeId, int32 targetTypMod, Oid targetCollation, ListCell *indirection, Node *rhs, int location) |
| static Node * | transformAssignmentSubscripts (ParseState *pstate, Node *basenode, const char *targetName, Oid targetTypeId, int32 targetTypMod, Oid targetCollation, List *subscripts, bool isSlice, ListCell *next_indirection, Node *rhs, int location) |
| static List * | ExpandColumnRefStar (ParseState *pstate, ColumnRef *cref, bool make_target_entry) |
| static List * | ExpandAllTables (ParseState *pstate, int location) |
| static List * | ExpandIndirectionStar (ParseState *pstate, A_Indirection *ind, bool make_target_entry, ParseExprKind exprKind) |
| static List * | ExpandSingleTable (ParseState *pstate, RangeTblEntry *rte, int location, bool make_target_entry) |
| static List * | ExpandRowReference (ParseState *pstate, Node *expr, bool make_target_entry) |
| static int | FigureColnameInternal (Node *node, char **name) |
| TargetEntry * | transformTargetEntry (ParseState *pstate, Node *node, Node *expr, ParseExprKind exprKind, char *colname, bool resjunk) |
| List * | transformTargetList (ParseState *pstate, List *targetlist, ParseExprKind exprKind) |
| List * | transformExpressionList (ParseState *pstate, List *exprlist, ParseExprKind exprKind) |
| void | markTargetListOrigins (ParseState *pstate, List *targetlist) |
| Expr * | transformAssignedExpr (ParseState *pstate, Expr *expr, ParseExprKind exprKind, char *colname, int attrno, List *indirection, int location) |
| void | updateTargetListEntry (ParseState *pstate, TargetEntry *tle, char *colname, int attrno, List *indirection, int location) |
| List * | checkInsertTargets (ParseState *pstate, List *cols, List **attrnos) |
| TupleDesc | expandRecordVariable (ParseState *pstate, Var *var, int levelsup) |
| char * | FigureColname (Node *node) |
| char * | FigureIndexColname (Node *node) |
| List* checkInsertTargets | ( | ParseState * | pstate, | |
| List * | cols, | |||
| List ** | attrnos | |||
| ) |
Definition at line 868 of file parse_target.c.
References attnameAttNum(), tupleDesc::attrs, bms_add_member(), bms_is_member(), ereport, errcode(), errmsg(), ERROR, i, ResTarget::indirection, InvalidAttrNumber, lappend(), lappend_int(), lfirst, ResTarget::location, makeNode, name, ResTarget::name, NameStr, NIL, ParseState::p_target_relation, parser_errposition(), pstrdup(), RelationData::rd_att, RelationData::rd_rel, RelationGetRelationName, and ResTarget::val.
Referenced by transformInsertStmt().
{
*attrnos = NIL;
if (cols == NIL)
{
/*
* Generate default column list for INSERT.
*/
Form_pg_attribute *attr = pstate->p_target_relation->rd_att->attrs;
int numcol = pstate->p_target_relation->rd_rel->relnatts;
int i;
for (i = 0; i < numcol; i++)
{
ResTarget *col;
if (attr[i]->attisdropped)
continue;
col = makeNode(ResTarget);
col->name = pstrdup(NameStr(attr[i]->attname));
col->indirection = NIL;
col->val = NULL;
col->location = -1;
cols = lappend(cols, col);
*attrnos = lappend_int(*attrnos, i + 1);
}
}
else
{
/*
* Do initial validation of user-supplied INSERT column list.
*/
Bitmapset *wholecols = NULL;
Bitmapset *partialcols = NULL;
ListCell *tl;
foreach(tl, cols)
{
ResTarget *col = (ResTarget *) lfirst(tl);
char *name = col->name;
int attrno;
/* Lookup column name, ereport on failure */
attrno = attnameAttNum(pstate->p_target_relation, name, false);
if (attrno == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column \"%s\" of relation \"%s\" does not exist",
name,
RelationGetRelationName(pstate->p_target_relation)),
parser_errposition(pstate, col->location)));
/*
* Check for duplicates, but only of whole columns --- we allow
* INSERT INTO foo (col.subcol1, col.subcol2)
*/
if (col->indirection == NIL)
{
/* whole column; must not have any other assignment */
if (bms_is_member(attrno, wholecols) ||
bms_is_member(attrno, partialcols))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name),
parser_errposition(pstate, col->location)));
wholecols = bms_add_member(wholecols, attrno);
}
else
{
/* partial column; must not have any whole assignment */
if (bms_is_member(attrno, wholecols))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name),
parser_errposition(pstate, col->location)));
partialcols = bms_add_member(partialcols, attrno);
}
*attrnos = lappend_int(*attrnos, attrno);
}
}
return cols;
}
| static List * ExpandAllTables | ( | ParseState * | pstate, | |
| int | location | |||
| ) | [static] |
Definition at line 1140 of file parse_target.c.
References Assert, ereport, errcode(), errmsg(), ERROR, expandRelAttrs(), lfirst, list_concat(), NULL, ParseNamespaceItem::p_cols_visible, ParseNamespaceItem::p_lateral_only, ParseState::p_namespace, ParseNamespaceItem::p_rte, parser_errposition(), and RTERangeTablePosn().
Referenced by ExpandColumnRefStar().
{
List *target = NIL;
bool found_table = false;
ListCell *l;
foreach(l, pstate->p_namespace)
{
ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(l);
RangeTblEntry *rte = nsitem->p_rte;
/* Ignore table-only items */
if (!nsitem->p_cols_visible)
continue;
/* Should not have any lateral-only items when parsing targetlist */
Assert(!nsitem->p_lateral_only);
/* Remember we found a p_cols_visible item */
found_table = true;
target = list_concat(target,
expandRelAttrs(pstate,
rte,
RTERangeTablePosn(pstate, rte,
NULL),
0,
location));
}
/*
* Check for "SELECT *;". We do it this way, rather than checking for
* target == NIL, because we want to allow SELECT * FROM a zero_column
* table.
*/
if (!found_table)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("SELECT * with no tables specified is not valid"),
parser_errposition(pstate, location)));
return target;
}
| static List * ExpandColumnRefStar | ( | ParseState * | pstate, | |
| ColumnRef * | cref, | |||
| bool | make_target_entry | |||
| ) | [static] |
Definition at line 970 of file parse_target.c.
References Assert, ereport, errcode(), errmsg(), ERROR, errorMissingRTE(), ExpandAllTables(), ExpandRowReference(), ExpandSingleTable(), ColumnRef::fields, get_database_name(), linitial, list_length(), ColumnRef::location, lsecond, lthird, makeRangeVar(), MyDatabaseId, NameListToString(), NULL, ParseState::p_post_columnref_hook, ParseState::p_pre_columnref_hook, parser_errposition(), refnameRangeTblEntry(), and strVal.
Referenced by transformExpressionList(), and transformTargetList().
{
List *fields = cref->fields;
int numnames = list_length(fields);
if (numnames == 1)
{
/*
* Target item is a bare '*', expand all tables
*
* (e.g., SELECT * FROM emp, dept)
*
* Since the grammar only accepts bare '*' at top level of SELECT, we
* need not handle the make_target_entry==false case here.
*/
Assert(make_target_entry);
return ExpandAllTables(pstate, cref->location);
}
else
{
/*
* Target item is relation.*, expand that table
*
* (e.g., SELECT emp.*, dname FROM emp, dept)
*
* Note: this code is a lot like transformColumnRef; it's tempting to
* call that instead and then replace the resulting whole-row Var with
* a list of Vars. However, that would leave us with the RTE's
* selectedCols bitmap showing the whole row as needing select
* permission, as well as the individual columns. That would be
* incorrect (since columns added later shouldn't need select
* permissions). We could try to remove the whole-row permission bit
* after the fact, but duplicating code is less messy.
*/
char *nspname = NULL;
char *relname = NULL;
RangeTblEntry *rte = NULL;
int levels_up;
enum
{
CRSERR_NO_RTE,
CRSERR_WRONG_DB,
CRSERR_TOO_MANY
} crserr = CRSERR_NO_RTE;
/*
* Give the PreParseColumnRefHook, if any, first shot. If it returns
* non-null then we should use that expression.
*/
if (pstate->p_pre_columnref_hook != NULL)
{
Node *node;
node = (*pstate->p_pre_columnref_hook) (pstate, cref);
if (node != NULL)
return ExpandRowReference(pstate, node, make_target_entry);
}
switch (numnames)
{
case 2:
relname = strVal(linitial(fields));
rte = refnameRangeTblEntry(pstate, nspname, relname,
cref->location,
&levels_up);
break;
case 3:
nspname = strVal(linitial(fields));
relname = strVal(lsecond(fields));
rte = refnameRangeTblEntry(pstate, nspname, relname,
cref->location,
&levels_up);
break;
case 4:
{
char *catname = strVal(linitial(fields));
/*
* We check the catalog name and then ignore it.
*/
if (strcmp(catname, get_database_name(MyDatabaseId)) != 0)
{
crserr = CRSERR_WRONG_DB;
break;
}
nspname = strVal(lsecond(fields));
relname = strVal(lthird(fields));
rte = refnameRangeTblEntry(pstate, nspname, relname,
cref->location,
&levels_up);
break;
}
default:
crserr = CRSERR_TOO_MANY;
break;
}
/*
* Now give the PostParseColumnRefHook, if any, a chance. We cheat a
* bit by passing the RangeTblEntry, not a Var, as the planned
* translation. (A single Var wouldn't be strictly correct anyway.
* This convention allows hooks that really care to know what is
* happening.)
*/
if (pstate->p_post_columnref_hook != NULL)
{
Node *node;
node = (*pstate->p_post_columnref_hook) (pstate, cref,
(Node *) rte);
if (node != NULL)
{
if (rte != NULL)
ereport(ERROR,
(errcode(ERRCODE_AMBIGUOUS_COLUMN),
errmsg("column reference \"%s\" is ambiguous",
NameListToString(cref->fields)),
parser_errposition(pstate, cref->location)));
return ExpandRowReference(pstate, node, make_target_entry);
}
}
/*
* Throw error if no translation found.
*/
if (rte == NULL)
{
switch (crserr)
{
case CRSERR_NO_RTE:
errorMissingRTE(pstate, makeRangeVar(nspname, relname,
cref->location));
break;
case CRSERR_WRONG_DB:
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cross-database references are not implemented: %s",
NameListToString(cref->fields)),
parser_errposition(pstate, cref->location)));
break;
case CRSERR_TOO_MANY:
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("improper qualified name (too many dotted names): %s",
NameListToString(cref->fields)),
parser_errposition(pstate, cref->location)));
break;
}
}
/*
* OK, expand the RTE into fields.
*/
return ExpandSingleTable(pstate, rte, cref->location, make_target_entry);
}
}
| static List * ExpandIndirectionStar | ( | ParseState * | pstate, | |
| A_Indirection * | ind, | |||
| bool | make_target_entry, | |||
| ParseExprKind | exprKind | |||
| ) | [static] |
Definition at line 1194 of file parse_target.c.
References copyObject(), ExpandRowReference(), A_Indirection::indirection, list_length(), list_truncate(), and transformExpr().
Referenced by transformExpressionList(), and transformTargetList().
{
Node *expr;
/* Strip off the '*' to create a reference to the rowtype object */
ind = copyObject(ind);
ind->indirection = list_truncate(ind->indirection,
list_length(ind->indirection) - 1);
/* And transform that */
expr = transformExpr(pstate, (Node *) ind, exprKind);
/* Expand the rowtype expression into individual fields */
return ExpandRowReference(pstate, expr, make_target_entry);
}
| TupleDesc expandRecordVariable | ( | ParseState * | pstate, | |
| Var * | var, | |||
| int | levelsup | |||
| ) |
Definition at line 1369 of file parse_target.c.
References Alias::aliasname, Assert, CreateTemplateTupleDesc(), RangeTblEntry::ctelevelsup, CommonTableExpr::ctequery, elog, RangeTblEntry::eref, ERROR, expandRecordVariable(), expandRTE(), TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), forboth, get_expr_result_type(), get_tle_by_resno(), GetCTEForRTE(), GetCTETargetList, GetRTEByRangeTablePosn(), i, InvalidAttrNumber, IsA, RangeTblEntry::joinaliasvars, label, lfirst, list_length(), list_nth(), Var::location, lookup_rowtype_tupdesc_copy(), MemSet, NULL, ParseState::p_rtable, ParseState::parentParseState, RECORDOID, TargetEntry::resjunk, Query::rtable, RTE_CTE, RTE_FUNCTION, RTE_JOIN, RTE_RELATION, RTE_SUBQUERY, RTE_VALUES, RangeTblEntry::rtekind, RangeTblEntry::self_reference, strVal, RangeTblEntry::subquery, Query::targetList, TupleDescInitEntry(), TupleDescInitEntryCollation(), TYPEFUNC_COMPOSITE, Var::varattno, Var::varlevelsup, Var::varno, and Var::vartype.
Referenced by expandRecordVariable(), ExpandRowReference(), and ParseComplexProjection().
{
TupleDesc tupleDesc;
int netlevelsup;
RangeTblEntry *rte;
AttrNumber attnum;
Node *expr;
/* Check my caller didn't mess up */
Assert(IsA(var, Var));
Assert(var->vartype == RECORDOID);
netlevelsup = var->varlevelsup + levelsup;
rte = GetRTEByRangeTablePosn(pstate, var->varno, netlevelsup);
attnum = var->varattno;
if (attnum == InvalidAttrNumber)
{
/* Whole-row reference to an RTE, so expand the known fields */
List *names,
*vars;
ListCell *lname,
*lvar;
int i;
expandRTE(rte, var->varno, 0, var->location, false,
&names, &vars);
tupleDesc = CreateTemplateTupleDesc(list_length(vars), false);
i = 1;
forboth(lname, names, lvar, vars)
{
char *label = strVal(lfirst(lname));
Node *varnode = (Node *) lfirst(lvar);
TupleDescInitEntry(tupleDesc, i,
label,
exprType(varnode),
exprTypmod(varnode),
0);
TupleDescInitEntryCollation(tupleDesc, i,
exprCollation(varnode));
i++;
}
Assert(lname == NULL && lvar == NULL); /* lists same length? */
return tupleDesc;
}
expr = (Node *) var; /* default if we can't drill down */
switch (rte->rtekind)
{
case RTE_RELATION:
case RTE_VALUES:
/*
* This case should not occur: a column of a table or values list
* shouldn't have type RECORD. Fall through and fail (most
* likely) at the bottom.
*/
break;
case RTE_SUBQUERY:
{
/* Subselect-in-FROM: examine sub-select's output expr */
TargetEntry *ste = get_tle_by_resno(rte->subquery->targetList,
attnum);
if (ste == NULL || ste->resjunk)
elog(ERROR, "subquery %s does not have attribute %d",
rte->eref->aliasname, attnum);
expr = (Node *) ste->expr;
if (IsA(expr, Var))
{
/*
* Recurse into the sub-select to see what its Var refers
* to. We have to build an additional level of ParseState
* to keep in step with varlevelsup in the subselect.
*/
ParseState mypstate;
MemSet(&mypstate, 0, sizeof(mypstate));
mypstate.parentParseState = pstate;
mypstate.p_rtable = rte->subquery->rtable;
/* don't bother filling the rest of the fake pstate */
return expandRecordVariable(&mypstate, (Var *) expr, 0);
}
/* else fall through to inspect the expression */
}
break;
case RTE_JOIN:
/* Join RTE --- recursively inspect the alias variable */
Assert(attnum > 0 && attnum <= list_length(rte->joinaliasvars));
expr = (Node *) list_nth(rte->joinaliasvars, attnum - 1);
if (IsA(expr, Var))
return expandRecordVariable(pstate, (Var *) expr, netlevelsup);
/* else fall through to inspect the expression */
break;
case RTE_FUNCTION:
/*
* We couldn't get here unless a function is declared with one of
* its result columns as RECORD, which is not allowed.
*/
break;
case RTE_CTE:
/* CTE reference: examine subquery's output expr */
if (!rte->self_reference)
{
CommonTableExpr *cte = GetCTEForRTE(pstate, rte, netlevelsup);
TargetEntry *ste;
ste = get_tle_by_resno(GetCTETargetList(cte), attnum);
if (ste == NULL || ste->resjunk)
elog(ERROR, "subquery %s does not have attribute %d",
rte->eref->aliasname, attnum);
expr = (Node *) ste->expr;
if (IsA(expr, Var))
{
/*
* Recurse into the CTE to see what its Var refers to. We
* have to build an additional level of ParseState to keep
* in step with varlevelsup in the CTE; furthermore it
* could be an outer CTE.
*/
ParseState mypstate;
Index levelsup;
MemSet(&mypstate, 0, sizeof(mypstate));
/* this loop must work, since GetCTEForRTE did */
for (levelsup = 0;
levelsup < rte->ctelevelsup + netlevelsup;
levelsup++)
pstate = pstate->parentParseState;
mypstate.parentParseState = pstate;
mypstate.p_rtable = ((Query *) cte->ctequery)->rtable;
/* don't bother filling the rest of the fake pstate */
return expandRecordVariable(&mypstate, (Var *) expr, 0);
}
/* else fall through to inspect the expression */
}
break;
}
/*
* We now have an expression we can't expand any more, so see if
* get_expr_result_type() can do anything with it. If not, pass to
* lookup_rowtype_tupdesc() which will probably fail, but will give an
* appropriate error message while failing.
*/
if (get_expr_result_type(expr, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
tupleDesc = lookup_rowtype_tupdesc_copy(exprType(expr),
exprTypmod(expr));
return tupleDesc;
}
| static List * ExpandRowReference | ( | ParseState * | pstate, | |
| Node * | expr, | |||
| bool | make_target_entry | |||
| ) | [static] |
Definition at line 1270 of file parse_target.c.
References FieldSelect::arg, Assert, tupleDesc::attrs, copyObject(), expandRecordVariable(), ExpandSingleTable(), exprType(), exprTypmod(), FieldSelect::fieldnum, get_expr_result_type(), GetRTEByRangeTablePosn(), i, InvalidAttrNumber, IsA, lappend(), Var::location, lookup_rowtype_tupdesc_copy(), makeNode, makeTargetEntry(), NameStr, tupleDesc::natts, NULL, ParseState::p_next_resno, pstrdup(), RECORDOID, FieldSelect::resultcollid, FieldSelect::resulttype, FieldSelect::resulttypmod, TYPEFUNC_COMPOSITE, Var::varlevelsup, and Var::varno.
Referenced by ExpandColumnRefStar(), and ExpandIndirectionStar().
{
List *result = NIL;
TupleDesc tupleDesc;
int numAttrs;
int i;
/*
* If the rowtype expression is a whole-row Var, we can expand the fields
* as simple Vars. Note: if the RTE is a relation, this case leaves us
* with the RTE's selectedCols bitmap showing the whole row as needing
* select permission, as well as the individual columns. However, we can
* only get here for weird notations like (table.*).*, so it's not worth
* trying to clean up --- arguably, the permissions marking is correct
* anyway for such cases.
*/
if (IsA(expr, Var) &&
((Var *) expr)->varattno == InvalidAttrNumber)
{
Var *var = (Var *) expr;
RangeTblEntry *rte;
rte = GetRTEByRangeTablePosn(pstate, var->varno, var->varlevelsup);
return ExpandSingleTable(pstate, rte, var->location, make_target_entry);
}
/*
* Otherwise we have to do it the hard way. Our current implementation is
* to generate multiple copies of the expression and do FieldSelects.
* (This can be pretty inefficient if the expression involves nontrivial
* computation :-(.)
*
* Verify it's a composite type, and get the tupdesc. We use
* get_expr_result_type() because that can handle references to functions
* returning anonymous record types. If that fails, use
* lookup_rowtype_tupdesc(), which will almost certainly fail as well, but
* it will give an appropriate error message.
*
* If it's a Var of type RECORD, we have to work even harder: we have to
* find what the Var refers to, and pass that to get_expr_result_type.
* That task is handled by expandRecordVariable().
*/
if (IsA(expr, Var) &&
((Var *) expr)->vartype == RECORDOID)
tupleDesc = expandRecordVariable(pstate, (Var *) expr, 0);
else if (get_expr_result_type(expr, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
tupleDesc = lookup_rowtype_tupdesc_copy(exprType(expr),
exprTypmod(expr));
Assert(tupleDesc);
/* Generate a list of references to the individual fields */
numAttrs = tupleDesc->natts;
for (i = 0; i < numAttrs; i++)
{
Form_pg_attribute att = tupleDesc->attrs[i];
FieldSelect *fselect;
if (att->attisdropped)
continue;
fselect = makeNode(FieldSelect);
fselect->arg = (Expr *) copyObject(expr);
fselect->fieldnum = i + 1;
fselect->resulttype = att->atttypid;
fselect->resulttypmod = att->atttypmod;
/* save attribute's collation for parse_collate.c */
fselect->resultcollid = att->attcollation;
if (make_target_entry)
{
/* add TargetEntry decoration */
TargetEntry *te;
te = makeTargetEntry((Expr *) fselect,
(AttrNumber) pstate->p_next_resno++,
pstrdup(NameStr(att->attname)),
false);
result = lappend(result, te);
}
else
result = lappend(result, fselect);
}
return result;
}
| static List * ExpandSingleTable | ( | ParseState * | pstate, | |
| RangeTblEntry * | rte, | |||
| int | location, | |||
| bool | make_target_entry | |||
| ) | [static] |
Definition at line 1221 of file parse_target.c.
References expandRelAttrs(), expandRTE(), lfirst, markVarForSelectPriv(), NULL, RangeTblEntry::requiredPerms, and RTERangeTablePosn().
Referenced by ExpandColumnRefStar(), and ExpandRowReference().
{
int sublevels_up;
int rtindex;
rtindex = RTERangeTablePosn(pstate, rte, &sublevels_up);
if (make_target_entry)
{
/* expandRelAttrs handles permissions marking */
return expandRelAttrs(pstate, rte, rtindex, sublevels_up,
location);
}
else
{
List *vars;
ListCell *l;
expandRTE(rte, rtindex, sublevels_up, location, false,
NULL, &vars);
/*
* Require read access to the table. This is normally redundant with
* the markVarForSelectPriv calls below, but not if the table has zero
* columns.
*/
rte->requiredPerms |= ACL_SELECT;
/* Require read access to each column */
foreach(l, vars)
{
Var *var = (Var *) lfirst(l);
markVarForSelectPriv(pstate, var, rte);
}
return vars;
}
}
| char* FigureColname | ( | Node * | node | ) |
Definition at line 1539 of file parse_target.c.
References FigureColnameInternal(), name, and NULL.
Referenced by transformRangeFunction(), transformTargetEntry(), and transformXmlExpr().
{
char *name = NULL;
(void) FigureColnameInternal(node, &name);
if (name != NULL)
return name;
/* default result if we can't guess anything */
return "?column?";
}
| static int FigureColnameInternal | ( | Node * | node, | |
| char ** | name | |||
| ) | [static] |
Definition at line 1578 of file parse_target.c.
References AEXPR_NULLIF, ALL_SUBLINK, ANY_SUBLINK, arg, A_Indirection::arg, ARRAY_SUBLINK, CTE_SUBLINK, EXISTS_SUBLINK, EXPR_SUBLINK, i, A_Indirection::indirection, IS_DOCUMENT, IS_GREATEST, IS_LEAST, IS_XMLCONCAT, IS_XMLELEMENT, IS_XMLFOREST, IS_XMLPARSE, IS_XMLPI, IS_XMLROOT, IS_XMLSERIALIZE, IsA, lfirst, linitial, llast, nodeTag, NULL, TargetEntry::resname, ROWCOMPARE_SUBLINK, strVal, SubLink::subselect, T_A_ArrayExpr, T_A_Expr, T_A_Indirection, T_CaseExpr, T_CoalesceExpr, T_CollateClause, T_ColumnRef, T_FuncCall, T_MinMaxExpr, T_RowExpr, T_SubLink, T_TypeCast, T_XmlExpr, T_XmlSerialize, and Query::targetList.
Referenced by FigureColname(), and FigureIndexColname().
{
int strength = 0;
if (node == NULL)
return strength;
switch (nodeTag(node))
{
case T_ColumnRef:
{
char *fname = NULL;
ListCell *l;
/* find last field name, if any, ignoring "*" */
foreach(l, ((ColumnRef *) node)->fields)
{
Node *i = lfirst(l);
if (IsA(i, String))
fname = strVal(i);
}
if (fname)
{
*name = fname;
return 2;
}
}
break;
case T_A_Indirection:
{
A_Indirection *ind = (A_Indirection *) node;
char *fname = NULL;
ListCell *l;
/* find last field name, if any, ignoring "*" and subscripts */
foreach(l, ind->indirection)
{
Node *i = lfirst(l);
if (IsA(i, String))
fname = strVal(i);
}
if (fname)
{
*name = fname;
return 2;
}
return FigureColnameInternal(ind->arg, name);
}
break;
case T_FuncCall:
*name = strVal(llast(((FuncCall *) node)->funcname));
return 2;
case T_A_Expr:
/* make nullif() act like a regular function */
if (((A_Expr *) node)->kind == AEXPR_NULLIF)
{
*name = "nullif";
return 2;
}
break;
case T_TypeCast:
strength = FigureColnameInternal(((TypeCast *) node)->arg,
name);
if (strength <= 1)
{
if (((TypeCast *) node)->typeName != NULL)
{
*name = strVal(llast(((TypeCast *) node)->typeName->names));
return 1;
}
}
break;
case T_CollateClause:
return FigureColnameInternal(((CollateClause *) node)->arg, name);
case T_SubLink:
switch (((SubLink *) node)->subLinkType)
{
case EXISTS_SUBLINK:
*name = "exists";
return 2;
case ARRAY_SUBLINK:
*name = "array";
return 2;
case EXPR_SUBLINK:
{
/* Get column name of the subquery's single target */
SubLink *sublink = (SubLink *) node;
Query *query = (Query *) sublink->subselect;
/*
* The subquery has probably already been transformed,
* but let's be careful and check that. (The reason
* we can see a transformed subquery here is that
* transformSubLink is lazy and modifies the SubLink
* node in-place.)
*/
if (IsA(query, Query))
{
TargetEntry *te = (TargetEntry *) linitial(query->targetList);
if (te->resname)
{
*name = te->resname;
return 2;
}
}
}
break;
/* As with other operator-like nodes, these have no names */
case ALL_SUBLINK:
case ANY_SUBLINK:
case ROWCOMPARE_SUBLINK:
case CTE_SUBLINK:
break;
}
break;
case T_CaseExpr:
strength = FigureColnameInternal((Node *) ((CaseExpr *) node)->defresult,
name);
if (strength <= 1)
{
*name = "case";
return 1;
}
break;
case T_A_ArrayExpr:
/* make ARRAY[] act like a function */
*name = "array";
return 2;
case T_RowExpr:
/* make ROW() act like a function */
*name = "row";
return 2;
case T_CoalesceExpr:
/* make coalesce() act like a regular function */
*name = "coalesce";
return 2;
case T_MinMaxExpr:
/* make greatest/least act like a regular function */
switch (((MinMaxExpr *) node)->op)
{
case IS_GREATEST:
*name = "greatest";
return 2;
case IS_LEAST:
*name = "least";
return 2;
}
break;
case T_XmlExpr:
/* make SQL/XML functions act like a regular function */
switch (((XmlExpr *) node)->op)
{
case IS_XMLCONCAT:
*name = "xmlconcat";
return 2;
case IS_XMLELEMENT:
*name = "xmlelement";
return 2;
case IS_XMLFOREST:
*name = "xmlforest";
return 2;
case IS_XMLPARSE:
*name = "xmlparse";
return 2;
case IS_XMLPI:
*name = "xmlpi";
return 2;
case IS_XMLROOT:
*name = "xmlroot";
return 2;
case IS_XMLSERIALIZE:
*name = "xmlserialize";
return 2;
case IS_DOCUMENT:
/* nothing */
break;
}
break;
case T_XmlSerialize:
*name = "xmlserialize";
return 2;
default:
break;
}
return strength;
}
| char* FigureIndexColname | ( | Node * | node | ) |
Definition at line 1558 of file parse_target.c.
References FigureColnameInternal(), and name.
Referenced by transformIndexStmt().
{
char *name = NULL;
(void) FigureColnameInternal(node, &name);
return name;
}
| static void markTargetListOrigin | ( | ParseState * | pstate, | |
| TargetEntry * | tle, | |||
| Var * | var, | |||
| int | levelsup | |||
| ) | [static] |
Definition at line 272 of file parse_target.c.
References Alias::aliasname, Assert, elog, RangeTblEntry::eref, ERROR, get_tle_by_resno(), GetCTEForRTE(), GetCTETargetList, GetRTEByRangeTablePosn(), InvalidAttrNumber, IsA, RangeTblEntry::joinaliasvars, list_length(), list_nth(), NULL, RangeTblEntry::relid, TargetEntry::resjunk, TargetEntry::resorigcol, TargetEntry::resorigtbl, RTE_CTE, RTE_FUNCTION, RTE_JOIN, RTE_RELATION, RTE_SUBQUERY, RTE_VALUES, RangeTblEntry::rtekind, RangeTblEntry::self_reference, RangeTblEntry::subquery, Query::targetList, Var::varattno, Var::varlevelsup, and Var::varno.
Referenced by markTargetListOrigins().
{
int netlevelsup;
RangeTblEntry *rte;
AttrNumber attnum;
if (var == NULL || !IsA(var, Var))
return;
netlevelsup = var->varlevelsup + levelsup;
rte = GetRTEByRangeTablePosn(pstate, var->varno, netlevelsup);
attnum = var->varattno;
switch (rte->rtekind)
{
case RTE_RELATION:
/* It's a table or view, report it */
tle->resorigtbl = rte->relid;
tle->resorigcol = attnum;
break;
case RTE_SUBQUERY:
/* Subselect-in-FROM: copy up from the subselect */
if (attnum != InvalidAttrNumber)
{
TargetEntry *ste = get_tle_by_resno(rte->subquery->targetList,
attnum);
if (ste == NULL || ste->resjunk)
elog(ERROR, "subquery %s does not have attribute %d",
rte->eref->aliasname, attnum);
tle->resorigtbl = ste->resorigtbl;
tle->resorigcol = ste->resorigcol;
}
break;
case RTE_JOIN:
/* Join RTE --- recursively inspect the alias variable */
if (attnum != InvalidAttrNumber)
{
Var *aliasvar;
Assert(attnum > 0 && attnum <= list_length(rte->joinaliasvars));
aliasvar = (Var *) list_nth(rte->joinaliasvars, attnum - 1);
markTargetListOrigin(pstate, tle, aliasvar, netlevelsup);
}
break;
case RTE_FUNCTION:
case RTE_VALUES:
/* not a simple relation, leave it unmarked */
break;
case RTE_CTE:
/*
* CTE reference: copy up from the subquery, if possible. If the
* RTE is a recursive self-reference then we can't do anything
* because we haven't finished analyzing it yet. However, it's no
* big loss because we must be down inside the recursive term of a
* recursive CTE, and so any markings on the current targetlist
* are not going to affect the results anyway.
*/
if (attnum != InvalidAttrNumber && !rte->self_reference)
{
CommonTableExpr *cte = GetCTEForRTE(pstate, rte, netlevelsup);
TargetEntry *ste;
ste = get_tle_by_resno(GetCTETargetList(cte), attnum);
if (ste == NULL || ste->resjunk)
elog(ERROR, "subquery %s does not have attribute %d",
rte->eref->aliasname, attnum);
tle->resorigtbl = ste->resorigtbl;
tle->resorigcol = ste->resorigcol;
}
break;
}
}
| void markTargetListOrigins | ( | ParseState * | pstate, | |
| List * | targetlist | |||
| ) |
Definition at line 250 of file parse_target.c.
References TargetEntry::expr, lfirst, and markTargetListOrigin().
Referenced by transformReturningList(), and transformSelectStmt().
{
ListCell *l;
foreach(l, targetlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(l);
markTargetListOrigin(pstate, tle, (Var *) tle->expr, 0);
}
}
| Expr* transformAssignedExpr | ( | ParseState * | pstate, | |
| Expr * | expr, | |||
| ParseExprKind | exprKind, | |||
| char * | colname, | |||
| int | attrno, | |||
| List * | indirection, | |||
| int | location | |||
| ) |
Definition at line 373 of file parse_target.c.
References Assert, attnumTypeId(), tupleDesc::attrs, COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, SetToDefault::collation, ereport, errcode(), errhint(), errmsg(), ERROR, EXPR_KIND_NONE, exprLocation(), exprType(), format_type_be(), IsA, linitial, list_head(), make_var(), makeNullConst(), NULL, ParseState::p_expr_kind, ParseState::p_is_insert, ParseState::p_target_rangetblentry, ParseState::p_target_relation, parser_errposition(), RelationData::rd_att, transformAssignmentIndirection(), SetToDefault::typeId, and SetToDefault::typeMod.
Referenced by transformInsertRow(), and updateTargetListEntry().
{
Relation rd = pstate->p_target_relation;
Oid type_id; /* type of value provided */
Oid attrtype; /* type of target column */
int32 attrtypmod;
Oid attrcollation; /* collation of target column */
ParseExprKind sv_expr_kind;
/*
* Save and restore identity of expression type we're parsing. We must
* set p_expr_kind here because we can parse subscripts without going
* through transformExpr().
*/
Assert(exprKind != EXPR_KIND_NONE);
sv_expr_kind = pstate->p_expr_kind;
pstate->p_expr_kind = exprKind;
Assert(rd != NULL);
if (attrno <= 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot assign to system column \"%s\"",
colname),
parser_errposition(pstate, location)));
attrtype = attnumTypeId(rd, attrno);
attrtypmod = rd->rd_att->attrs[attrno - 1]->atttypmod;
attrcollation = rd->rd_att->attrs[attrno - 1]->attcollation;
/*
* If the expression is a DEFAULT placeholder, insert the attribute's
* type/typmod/collation into it so that exprType etc will report the
* right things. (We expect that the eventually substituted default
* expression will in fact have this type and typmod. The collation
* likely doesn't matter, but let's set it correctly anyway.) Also,
* reject trying to update a subfield or array element with DEFAULT, since
* there can't be any default for portions of a column.
*/
if (expr && IsA(expr, SetToDefault))
{
SetToDefault *def = (SetToDefault *) expr;
def->typeId = attrtype;
def->typeMod = attrtypmod;
def->collation = attrcollation;
if (indirection)
{
if (IsA(linitial(indirection), A_Indices))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot set an array element to DEFAULT"),
parser_errposition(pstate, location)));
else
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot set a subfield to DEFAULT"),
parser_errposition(pstate, location)));
}
}
/* Now we can use exprType() safely. */
type_id = exprType((Node *) expr);
/*
* If there is indirection on the target column, prepare an array or
* subfield assignment expression. This will generate a new column value
* that the source value has been inserted into, which can then be placed
* in the new tuple constructed by INSERT or UPDATE.
*/
if (indirection)
{
Node *colVar;
if (pstate->p_is_insert)
{
/*
* The command is INSERT INTO table (col.something) ... so there
* is not really a source value to work with. Insert a NULL
* constant as the source value.
*/
colVar = (Node *) makeNullConst(attrtype, attrtypmod,
attrcollation);
}
else
{
/*
* Build a Var for the column to be updated.
*/
colVar = (Node *) make_var(pstate,
pstate->p_target_rangetblentry,
attrno,
location);
}
expr = (Expr *)
transformAssignmentIndirection(pstate,
colVar,
colname,
false,
attrtype,
attrtypmod,
attrcollation,
list_head(indirection),
(Node *) expr,
location);
}
else
{
/*
* For normal non-qualified target column, do type checking and
* coercion.
*/
Node *orig_expr = (Node *) expr;
expr = (Expr *)
coerce_to_target_type(pstate,
orig_expr, type_id,
attrtype, attrtypmod,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST,
-1);
if (expr == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("column \"%s\" is of type %s"
" but expression is of type %s",
colname,
format_type_be(attrtype),
format_type_be(type_id)),
errhint("You will need to rewrite or cast the expression."),
parser_errposition(pstate, exprLocation(orig_expr))));
}
pstate->p_expr_kind = sv_expr_kind;
return expr;
}
| static Node * transformAssignmentIndirection | ( | ParseState * | pstate, | |
| Node * | basenode, | |||
| const char * | targetName, | |||
| bool | targetIsArray, | |||
| Oid | targetTypeId, | |||
| int32 | targetTypMod, | |||
| Oid | targetCollation, | |||
| ListCell * | indirection, | |||
| Node * | rhs, | |||
| int | location | |||
| ) | [static] |
Definition at line 593 of file parse_target.c.
References FieldStore::arg, Assert, COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, CaseTestExpr::collation, ereport, errcode(), errhint(), errmsg(), ERROR, exprType(), FieldStore::fieldnums, for_each_cell, format_type_be(), get_attnum(), get_atttypetypmodcoll(), i, InvalidAttrNumber, IsA, lappend(), lfirst, list_make1, list_make1_int, lnext, makeNode, FieldStore::newvals, NULL, parser_errposition(), FieldStore::resulttype, strVal, transformAssignmentSubscripts(), CaseTestExpr::typeId, typeidTypeRelid(), and CaseTestExpr::typeMod.
Referenced by transformAssignedExpr(), and transformAssignmentSubscripts().
{
Node *result;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
if (indirection && !basenode)
{
/* Set up a substitution. We reuse CaseTestExpr for this. */
CaseTestExpr *ctest = makeNode(CaseTestExpr);
ctest->typeId = targetTypeId;
ctest->typeMod = targetTypMod;
ctest->collation = targetCollation;
basenode = (Node *) ctest;
}
/*
* We have to split any field-selection operations apart from
* subscripting. Adjacent A_Indices nodes have to be treated as a single
* multidimensional subscript operation.
*/
for_each_cell(i, indirection)
{
Node *n = lfirst(i);
if (IsA(n, A_Indices))
{
subscripts = lappend(subscripts, n);
if (((A_Indices *) n)->lidx != NULL)
isSlice = true;
}
else if (IsA(n, A_Star))
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("row expansion via \"*\" is not supported here"),
parser_errposition(pstate, location)));
}
else
{
FieldStore *fstore;
Oid typrelid;
AttrNumber attnum;
Oid fieldTypeId;
int32 fieldTypMod;
Oid fieldCollation;
Assert(IsA(n, String));
/* process subscripts before this field selection */
if (subscripts)
{
/* recurse, and then return because we're done */
return transformAssignmentSubscripts(pstate,
basenode,
targetName,
targetTypeId,
targetTypMod,
targetCollation,
subscripts,
isSlice,
i,
rhs,
location);
}
/* No subscripts, so can process field selection here */
typrelid = typeidTypeRelid(targetTypeId);
if (!typrelid)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("cannot assign to field \"%s\" of column \"%s\" because its type %s is not a composite type",
strVal(n), targetName,
format_type_be(targetTypeId)),
parser_errposition(pstate, location)));
attnum = get_attnum(typrelid, strVal(n));
if (attnum == InvalidAttrNumber)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("cannot assign to field \"%s\" of column \"%s\" because there is no such column in data type %s",
strVal(n), targetName,
format_type_be(targetTypeId)),
parser_errposition(pstate, location)));
if (attnum < 0)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("cannot assign to system column \"%s\"",
strVal(n)),
parser_errposition(pstate, location)));
get_atttypetypmodcoll(typrelid, attnum,
&fieldTypeId, &fieldTypMod, &fieldCollation);
/* recurse to create appropriate RHS for field assign */
rhs = transformAssignmentIndirection(pstate,
NULL,
strVal(n),
false,
fieldTypeId,
fieldTypMod,
fieldCollation,
lnext(i),
rhs,
location);
/* and build a FieldStore node */
fstore = makeNode(FieldStore);
fstore->arg = (Expr *) basenode;
fstore->newvals = list_make1(rhs);
fstore->fieldnums = list_make1_int(attnum);
fstore->resulttype = targetTypeId;
return (Node *) fstore;
}
}
/* process trailing subscripts, if any */
if (subscripts)
{
/* recurse, and then return because we're done */
return transformAssignmentSubscripts(pstate,
basenode,
targetName,
targetTypeId,
targetTypMod,
targetCollation,
subscripts,
isSlice,
NULL,
rhs,
location);
}
/* base case: just coerce RHS to match target type ID */
result = coerce_to_target_type(pstate,
rhs, exprType(rhs),
targetTypeId, targetTypMod,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST,
-1);
if (result == NULL)
{
if (targetIsArray)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("array assignment to \"%s\" requires type %s"
" but expression is of type %s",
targetName,
format_type_be(targetTypeId),
format_type_be(exprType(rhs))),
errhint("You will need to rewrite or cast the expression."),
parser_errposition(pstate, location)));
else
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
" but expression is of type %s",
targetName,
format_type_be(targetTypeId),
format_type_be(exprType(rhs))),
errhint("You will need to rewrite or cast the expression."),
parser_errposition(pstate, location)));
}
return result;
}
| static Node * transformAssignmentSubscripts | ( | ParseState * | pstate, | |
| Node * | basenode, | |||
| const char * | targetName, | |||
| Oid | targetTypeId, | |||
| int32 | targetTypMod, | |||
| Oid | targetCollation, | |||
| List * | subscripts, | |||
| bool | isSlice, | |||
| ListCell * | next_indirection, | |||
| Node * | rhs, | |||
| int | location | |||
| ) | [static] |
Definition at line 778 of file parse_target.c.
References Assert, COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, ereport, errcode(), errmsg(), ERROR, exprType(), format_type_be(), get_typcollation(), NIL, NULL, parser_errposition(), transformArraySubscripts(), transformArrayType(), and transformAssignmentIndirection().
Referenced by transformAssignmentIndirection().
{
Node *result;
Oid arrayType;
int32 arrayTypMod;
Oid elementTypeId;
Oid typeNeeded;
Oid collationNeeded;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
arrayType = targetTypeId;
arrayTypMod = targetTypMod;
elementTypeId = transformArrayType(&arrayType, &arrayTypMod);
/* Identify type that RHS must provide */
typeNeeded = isSlice ? arrayType : elementTypeId;
/*
* Array normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over an array type. In
* that case use collation of the base type.
*/
if (arrayType == targetTypeId)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(arrayType);
/* recurse to create appropriate RHS for array assign */
rhs = transformAssignmentIndirection(pstate,
NULL,
targetName,
true,
typeNeeded,
arrayTypMod,
collationNeeded,
next_indirection,
rhs,
location);
/* process subscripts */
result = (Node *) transformArraySubscripts(pstate,
basenode,
arrayType,
elementTypeId,
arrayTypMod,
subscripts,
rhs);
/* If target was a domain over array, need to coerce up to the domain */
if (arrayType != targetTypeId)
{
result = coerce_to_target_type(pstate,
result, exprType(result),
targetTypeId, targetTypMod,
COERCION_ASSIGNMENT,
COERCE_IMPLICIT_CAST,
-1);
/* probably shouldn't fail, but check */
if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_CANNOT_COERCE),
errmsg("cannot cast type %s to %s",
format_type_be(exprType(result)),
format_type_be(targetTypeId)),
parser_errposition(pstate, location)));
}
return result;
}
| List* transformExpressionList | ( | ParseState * | pstate, | |
| List * | exprlist, | |||
| ParseExprKind | exprKind | |||
| ) |
Definition at line 188 of file parse_target.c.
References ExpandColumnRefStar(), ExpandIndirectionStar(), ColumnRef::fields, A_Indirection::indirection, IsA, lappend(), lfirst, list_concat(), llast, and transformExpr().
Referenced by transformRowExpr(), and transformValuesClause().
{
List *result = NIL;
ListCell *lc;
foreach(lc, exprlist)
{
Node *e = (Node *) lfirst(lc);
/*
* Check for "something.*". Depending on the complexity of the
* "something", the star could appear as the last field in ColumnRef,
* or as the last indirection item in A_Indirection.
*/
if (IsA(e, ColumnRef))
{
ColumnRef *cref = (ColumnRef *) e;
if (IsA(llast(cref->fields), A_Star))
{
/* It is something.*, expand into multiple items */
result = list_concat(result,
ExpandColumnRefStar(pstate, cref,
false));
continue;
}
}
else if (IsA(e, A_Indirection))
{
A_Indirection *ind = (A_Indirection *) e;
if (IsA(llast(ind->indirection), A_Star))
{
/* It is something.*, expand into multiple items */
result = list_concat(result,
ExpandIndirectionStar(pstate, ind,
false, exprKind));
continue;
}
}
/*
* Not "something.*", so transform as a single expression
*/
result = lappend(result,
transformExpr(pstate, e, exprKind));
}
return result;
}
| TargetEntry* transformTargetEntry | ( | ParseState * | pstate, | |
| Node * | node, | |||
| Node * | expr, | |||
| ParseExprKind | exprKind, | |||
| char * | colname, | |||
| bool | resjunk | |||
| ) |
Definition at line 85 of file parse_target.c.
References FigureColname(), makeTargetEntry(), NULL, ParseState::p_next_resno, and transformExpr().
Referenced by findTargetlistEntrySQL99(), and transformTargetList().
{
/* Transform the node if caller didn't do it already */
if (expr == NULL)
expr = transformExpr(pstate, node, exprKind);
if (colname == NULL && !resjunk)
{
/*
* Generate a suitable column name for a column without any explicit
* 'AS ColumnName' clause.
*/
colname = FigureColname(node);
}
return makeTargetEntry((Expr *) expr,
(AttrNumber) pstate->p_next_resno++,
colname,
resjunk);
}
| List* transformTargetList | ( | ParseState * | pstate, | |
| List * | targetlist, | |||
| ParseExprKind | exprKind | |||
| ) |
Definition at line 121 of file parse_target.c.
References ExpandColumnRefStar(), ExpandIndirectionStar(), ColumnRef::fields, A_Indirection::indirection, IsA, lappend(), lfirst, list_concat(), llast, ResTarget::name, NULL, transformTargetEntry(), and ResTarget::val.
Referenced by transformReturningList(), transformSelectStmt(), and transformUpdateStmt().
{
List *p_target = NIL;
ListCell *o_target;
foreach(o_target, targetlist)
{
ResTarget *res = (ResTarget *) lfirst(o_target);
/*
* Check for "something.*". Depending on the complexity of the
* "something", the star could appear as the last field in ColumnRef,
* or as the last indirection item in A_Indirection.
*/
if (IsA(res->val, ColumnRef))
{
ColumnRef *cref = (ColumnRef *) res->val;
if (IsA(llast(cref->fields), A_Star))
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandColumnRefStar(pstate, cref,
true));
continue;
}
}
else if (IsA(res->val, A_Indirection))
{
A_Indirection *ind = (A_Indirection *) res->val;
if (IsA(llast(ind->indirection), A_Star))
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandIndirectionStar(pstate, ind,
true, exprKind));
continue;
}
}
/*
* Not "something.*", so transform as a single expression
*/
p_target = lappend(p_target,
transformTargetEntry(pstate,
res->val,
NULL,
exprKind,
res->name,
false));
}
return p_target;
}
| void updateTargetListEntry | ( | ParseState * | pstate, | |
| TargetEntry * | tle, | |||
| char * | colname, | |||
| int | attrno, | |||
| List * | indirection, | |||
| int | location | |||
| ) |
Definition at line 534 of file parse_target.c.
References TargetEntry::expr, EXPR_KIND_UPDATE_TARGET, TargetEntry::resname, TargetEntry::resno, and transformAssignedExpr().
Referenced by transformUpdateStmt().
{
/* Fix up expression as needed */
tle->expr = transformAssignedExpr(pstate,
tle->expr,
EXPR_KIND_UPDATE_TARGET,
colname,
attrno,
indirection,
location);
/*
* Set the resno to identify the target column --- the rewriter and
* planner depend on this. We also set the resname to identify the target
* column, but this is only for debugging purposes; it should not be
* relied on. (In particular, it might be out of date in a stored rule.)
*/
tle->resno = (AttrNumber) attrno;
tle->resname = colname;
}
1.7.1