#include "nodes/parsenodes.h"
Go to the source code of this file.
Data Structures | |
struct | replace_rte_variables_context |
Typedefs | |
typedef struct replace_rte_variables_context | replace_rte_variables_context |
typedef Node *(* | replace_rte_variables_callback )(Var *var, replace_rte_variables_context *context) |
typedef enum ReplaceVarsNoMatchOption | ReplaceVarsNoMatchOption |
Enumerations | |
enum | ReplaceVarsNoMatchOption { REPLACEVARS_REPORT_ERROR, REPLACEVARS_CHANGE_VARNO, REPLACEVARS_SUBSTITUTE_NULL } |
Functions | |
void | OffsetVarNodes (Node *node, int offset, int sublevels_up) |
void | ChangeVarNodes (Node *node, int old_varno, int new_varno, int sublevels_up) |
void | IncrementVarSublevelsUp (Node *node, int delta_sublevels_up, int min_sublevels_up) |
void | IncrementVarSublevelsUp_rtable (List *rtable, int delta_sublevels_up, int min_sublevels_up) |
bool | rangeTableEntry_used (Node *node, int rt_index, int sublevels_up) |
bool | attribute_used (Node *node, int rt_index, int attno, int sublevels_up) |
Query * | getInsertSelectQuery (Query *parsetree, Query ***subquery_ptr) |
void | AddQual (Query *parsetree, Node *qual) |
void | AddInvertedQual (Query *parsetree, Node *qual) |
bool | contain_aggs_of_level (Node *node, int levelsup) |
int | locate_agg_of_level (Node *node, int levelsup) |
bool | contain_windowfuncs (Node *node) |
int | locate_windowfunc (Node *node) |
bool | checkExprHasSubLink (Node *node) |
Node * | replace_rte_variables (Node *node, int target_varno, int sublevels_up, replace_rte_variables_callback callback, void *callback_arg, bool *outer_hasSubLinks) |
Node * | replace_rte_variables_mutator (Node *node, replace_rte_variables_context *context) |
Node * | map_variable_attnos (Node *node, int target_varno, int sublevels_up, const AttrNumber *attno_map, int map_length, bool *found_whole_row) |
Node * | ReplaceVarsFromTargetList (Node *node, int target_varno, int sublevels_up, RangeTblEntry *target_rte, List *targetlist, ReplaceVarsNoMatchOption nomatch_option, int nomatch_varno, bool *outer_hasSubLinks) |
typedef Node*(* replace_rte_variables_callback)(Var *var, replace_rte_variables_context *context) |
Definition at line 22 of file rewriteManip.h.
typedef struct replace_rte_variables_context replace_rte_variables_context |
Definition at line 20 of file rewriteManip.h.
typedef enum ReplaceVarsNoMatchOption ReplaceVarsNoMatchOption |
Definition at line 34 of file rewriteManip.h.
{ REPLACEVARS_REPORT_ERROR, /* throw error if no match */ REPLACEVARS_CHANGE_VARNO, /* change the Var's varno, nothing else */ REPLACEVARS_SUBSTITUTE_NULL /* replace with a NULL Const */ } ReplaceVarsNoMatchOption;
Definition at line 1061 of file rewriteManip.c.
References AddQual(), BooleanTest::arg, BooleanTest::booltesttype, makeNode, and NULL.
Referenced by CopyAndAddInvertedQual().
{ BooleanTest *invqual; if (qual == NULL) return; /* Need not copy input qual, because AddQual will... */ invqual = makeNode(BooleanTest); invqual->arg = (Expr *) qual; invqual->booltesttype = IS_NOT_TRUE; AddQual(parsetree, (Node *) invqual); }
Definition at line 993 of file rewriteManip.c.
References Assert, checkExprHasSubLink(), CMD_UTILITY, Query::commandType, contain_aggs_of_level(), copyObject(), ereport, errcode(), errmsg(), ERROR, Query::hasSubLinks, IsA, Query::jointree, make_and_qual(), NULL, FromExpr::quals, Query::setOperations, and Query::utilityStmt.
Referenced by AddInvertedQual(), rewriteRuleAction(), and rewriteTargetView().
{ Node *copy; if (qual == NULL) return; if (parsetree->commandType == CMD_UTILITY) { /* * There's noplace to put the qual on a utility statement. * * If it's a NOTIFY, silently ignore the qual; this means that the * NOTIFY will execute, whether or not there are any qualifying rows. * While clearly wrong, this is much more useful than refusing to * execute the rule at all, and extra NOTIFY events are harmless for * typical uses of NOTIFY. * * If it isn't a NOTIFY, error out, since unconditional execution of * other utility stmts is unlikely to be wanted. (This case is not * currently allowed anyway, but keep the test for safety.) */ if (parsetree->utilityStmt && IsA(parsetree->utilityStmt, NotifyStmt)) return; else ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("conditional utility statements are not implemented"))); } if (parsetree->setOperations != NULL) { /* * There's noplace to put the qual on a setop statement, either. (This * could be fixed, but right now the planner simply ignores any qual * condition on a setop query.) */ ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("conditional UNION/INTERSECT/EXCEPT statements are not implemented"))); } /* INTERSECT want's the original, but we need to copy - Jan */ copy = copyObject(qual); parsetree->jointree->quals = make_and_qual(parsetree->jointree->quals, copy); /* * We had better not have stuck an aggregate into the WHERE clause. */ Assert(!contain_aggs_of_level(copy, 0)); /* * Make sure query is marked correctly if added qual has sublinks. Need * not search qual when query is already marked. */ if (!parsetree->hasSubLinks) parsetree->hasSubLinks = checkExprHasSubLink(copy); }
Definition at line 905 of file rewriteManip.c.
References attribute_used_context::attno, attribute_used_walker(), query_or_expression_tree_walker(), attribute_used_context::rt_index, and attribute_used_context::sublevels_up.
Referenced by fireRIRrules(), and matchLocks().
{ attribute_used_context context; context.rt_index = rt_index; context.attno = attno; context.sublevels_up = sublevels_up; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ return query_or_expression_tree_walker(node, attribute_used_walker, (void *) &context, 0); }
void ChangeVarNodes | ( | Node * | node, | |
int | old_varno, | |||
int | new_varno, | |||
int | sublevels_up | |||
) |
Definition at line 572 of file rewriteManip.c.
References ChangeVarNodes_walker(), IsA, lfirst, ChangeVarNodes_context::new_index, query_tree_walker(), Query::resultRelation, Query::rowMarks, ChangeVarNodes_context::rt_index, RowMarkClause::rti, and ChangeVarNodes_context::sublevels_up.
Referenced by ApplyRetrieveRule(), CopyAndAddInvertedQual(), get_relation_constraints(), get_relation_info(), inheritance_planner(), rewriteRuleAction(), rewriteTargetView(), and TriggerEnabled().
{ ChangeVarNodes_context context; context.rt_index = rt_index; context.new_index = new_index; context.sublevels_up = sublevels_up; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, go straight to query_tree_walker to make sure that * sublevels_up doesn't get incremented prematurely. */ if (node && IsA(node, Query)) { Query *qry = (Query *) node; /* * If we are starting at a Query, and sublevels_up is zero, then we * must also fix rangetable indexes in the Query itself --- namely * resultRelation and rowMarks entries. sublevels_up cannot be zero * when recursing into a subquery, so there's no need to have the same * logic inside ChangeVarNodes_walker. */ if (sublevels_up == 0) { ListCell *l; if (qry->resultRelation == rt_index) qry->resultRelation = new_index; foreach(l, qry->rowMarks) { RowMarkClause *rc = (RowMarkClause *) lfirst(l); if (rc->rti == rt_index) rc->rti = new_index; } } query_tree_walker(qry, ChangeVarNodes_walker, (void *) &context, 0); } else ChangeVarNodes_walker(node, &context); }
Definition at line 262 of file rewriteManip.c.
References checkExprHasSubLink_walker(), NULL, QTW_IGNORE_RC_SUBQUERIES, and query_or_expression_tree_walker().
Referenced by AddQual(), flatten_join_alias_vars_mutator(), replace_rte_variables_mutator(), and rewriteRuleAction().
{ /* * If a Query is passed, examine it --- but we should not recurse into * sub-Queries that are in its rangetable or CTE list. */ return query_or_expression_tree_walker(node, checkExprHasSubLink_walker, NULL, QTW_IGNORE_RC_SUBQUERIES); }
Definition at line 67 of file rewriteManip.c.
References contain_aggs_of_level_walker(), query_or_expression_tree_walker(), and contain_aggs_of_level_context::sublevels_up.
Referenced by AddQual(), checkTargetlistEntrySQL92(), and convert_EXISTS_to_ANY().
{ contain_aggs_of_level_context context; context.sublevels_up = levelsup; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ return query_or_expression_tree_walker(node, contain_aggs_of_level_walker, (void *) &context, 0); }
Definition at line 182 of file rewriteManip.c.
References contain_windowfuncs_walker(), NULL, and query_or_expression_tree_walker().
Referenced by checkTargetlistEntrySQL92(), contain_window_function(), and transformWindowFuncCall().
{ /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ return query_or_expression_tree_walker(node, contain_windowfuncs_walker, NULL, 0); }
Definition at line 938 of file rewriteManip.c.
References Assert, CMD_INSERT, CMD_SELECT, Query::commandType, elog, ERROR, FromExpr::fromlist, IsA, Query::jointree, linitial, list_length(), NULL, PRS2_NEW_VARNO, PRS2_OLD_VARNO, rt_fetch, Query::rtable, RangeTblRef::rtindex, and RangeTblEntry::subquery.
Referenced by DefineQueryRewrite(), InsertRule(), make_ruledef(), rewriteRuleAction(), and transformRuleStmt().
{ Query *selectquery; RangeTblEntry *selectrte; RangeTblRef *rtr; if (subquery_ptr) *subquery_ptr = NULL; if (parsetree == NULL) return parsetree; if (parsetree->commandType != CMD_INSERT) return parsetree; /* * Currently, this is ONLY applied to rule-action queries, and so we * expect to find the OLD and NEW placeholder entries in the given query. * If they're not there, it must be an INSERT/SELECT in which they've been * pushed down to the SELECT. */ if (list_length(parsetree->rtable) >= 2 && strcmp(rt_fetch(PRS2_OLD_VARNO, parsetree->rtable)->eref->aliasname, "old") == 0 && strcmp(rt_fetch(PRS2_NEW_VARNO, parsetree->rtable)->eref->aliasname, "new") == 0) return parsetree; Assert(parsetree->jointree && IsA(parsetree->jointree, FromExpr)); if (list_length(parsetree->jointree->fromlist) != 1) elog(ERROR, "expected to find SELECT subquery"); rtr = (RangeTblRef *) linitial(parsetree->jointree->fromlist); Assert(IsA(rtr, RangeTblRef)); selectrte = rt_fetch(rtr->rtindex, parsetree->rtable); selectquery = selectrte->subquery; if (!(selectquery && IsA(selectquery, Query) && selectquery->commandType == CMD_SELECT)) elog(ERROR, "expected to find SELECT subquery"); if (list_length(selectquery->rtable) >= 2 && strcmp(rt_fetch(PRS2_OLD_VARNO, selectquery->rtable)->eref->aliasname, "old") == 0 && strcmp(rt_fetch(PRS2_NEW_VARNO, selectquery->rtable)->eref->aliasname, "new") == 0) { if (subquery_ptr) *subquery_ptr = &(selectrte->subquery); return selectquery; } elog(ERROR, "could not find rule placeholders"); return NULL; /* not reached */ }
void IncrementVarSublevelsUp | ( | Node * | node, | |
int | delta_sublevels_up, | |||
int | min_sublevels_up | |||
) |
Definition at line 725 of file rewriteManip.c.
References IncrementVarSublevelsUp_context::delta_sublevels_up, IncrementVarSublevelsUp_walker(), IncrementVarSublevelsUp_context::min_sublevels_up, QTW_EXAMINE_RTES, and query_or_expression_tree_walker().
Referenced by assign_param_for_placeholdervar(), convert_EXISTS_sublink_to_join(), convert_EXISTS_to_ANY(), extract_lateral_references(), flatten_join_alias_vars_mutator(), pull_up_simple_subquery(), pullup_replace_vars_callback(), replace_outer_agg(), ReplaceVarsFromTargetList_callback(), and substitute_actual_srf_parameters_mutator().
{ IncrementVarSublevelsUp_context context; context.delta_sublevels_up = delta_sublevels_up; context.min_sublevels_up = min_sublevels_up; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ query_or_expression_tree_walker(node, IncrementVarSublevelsUp_walker, (void *) &context, QTW_EXAMINE_RTES); }
void IncrementVarSublevelsUp_rtable | ( | List * | rtable, | |
int | delta_sublevels_up, | |||
int | min_sublevels_up | |||
) |
Definition at line 748 of file rewriteManip.c.
References IncrementVarSublevelsUp_context::delta_sublevels_up, IncrementVarSublevelsUp_walker(), IncrementVarSublevelsUp_context::min_sublevels_up, QTW_EXAMINE_RTES, and range_table_walker().
Referenced by pull_up_simple_union_all().
{ IncrementVarSublevelsUp_context context; context.delta_sublevels_up = delta_sublevels_up; context.min_sublevels_up = min_sublevels_up; range_table_walker(rtable, IncrementVarSublevelsUp_walker, (void *) &context, QTW_EXAMINE_RTES); }
int locate_agg_of_level | ( | Node * | node, | |
int | levelsup | |||
) |
Definition at line 125 of file rewriteManip.c.
References locate_agg_of_level_context::agg_location, locate_agg_of_level_walker(), query_or_expression_tree_walker(), and locate_agg_of_level_context::sublevels_up.
Referenced by check_agg_arguments(), checkTargetlistEntrySQL92(), and parseCheckAggregates().
{ locate_agg_of_level_context context; context.agg_location = -1; /* in case we find nothing */ context.sublevels_up = levelsup; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ (void) query_or_expression_tree_walker(node, locate_agg_of_level_walker, (void *) &context, 0); return context.agg_location; }
int locate_windowfunc | ( | Node * | node | ) |
Definition at line 220 of file rewriteManip.c.
References locate_windowfunc_walker(), query_or_expression_tree_walker(), and locate_windowfunc_context::win_location.
Referenced by checkTargetlistEntrySQL92(), and transformWindowFuncCall().
{ locate_windowfunc_context context; context.win_location = -1; /* in case we find nothing */ /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ (void) query_or_expression_tree_walker(node, locate_windowfunc_walker, (void *) &context, 0); return context.win_location; }
Node* map_variable_attnos | ( | Node * | node, | |
int | target_varno, | |||
int | sublevels_up, | |||
const AttrNumber * | attno_map, | |||
int | map_length, | |||
bool * | found_whole_row | |||
) |
Definition at line 1299 of file rewriteManip.c.
References map_variable_attnos_context::attno_map, map_variable_attnos_context::found_whole_row, map_variable_attnos_context::map_length, map_variable_attnos_mutator(), query_or_expression_tree_mutator(), map_variable_attnos_context::sublevels_up, and map_variable_attnos_context::target_varno.
Referenced by generateClonedIndexStmt(), MergeAttributes(), and transformTableLikeClause().
{ map_variable_attnos_context context; context.target_varno = target_varno; context.sublevels_up = sublevels_up; context.attno_map = attno_map; context.map_length = map_length; context.found_whole_row = found_whole_row; *found_whole_row = false; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ return query_or_expression_tree_mutator(node, map_variable_attnos_mutator, (void *) &context, 0); }
void OffsetVarNodes | ( | Node * | node, | |
int | offset, | |||
int | sublevels_up | |||
) |
Definition at line 390 of file rewriteManip.c.
References IsA, lfirst, OffsetVarNodes_context::offset, OffsetVarNodes_walker(), query_tree_walker(), Query::resultRelation, Query::rowMarks, RowMarkClause::rti, and OffsetVarNodes_context::sublevels_up.
Referenced by convert_EXISTS_sublink_to_join(), pull_up_simple_subquery(), rewriteRuleAction(), and UpdateRangeTableOfViewParse().
{ OffsetVarNodes_context context; context.offset = offset; context.sublevels_up = sublevels_up; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, go straight to query_tree_walker to make sure that * sublevels_up doesn't get incremented prematurely. */ if (node && IsA(node, Query)) { Query *qry = (Query *) node; /* * If we are starting at a Query, and sublevels_up is zero, then we * must also fix rangetable indexes in the Query itself --- namely * resultRelation and rowMarks entries. sublevels_up cannot be zero * when recursing into a subquery, so there's no need to have the same * logic inside OffsetVarNodes_walker. */ if (sublevels_up == 0) { ListCell *l; if (qry->resultRelation) qry->resultRelation += offset; foreach(l, qry->rowMarks) { RowMarkClause *rc = (RowMarkClause *) lfirst(l); rc->rti += offset; } } query_tree_walker(qry, OffsetVarNodes_walker, (void *) &context, 0); } else OffsetVarNodes_walker(node, &context); }
Definition at line 842 of file rewriteManip.c.
References query_or_expression_tree_walker(), rangeTableEntry_used_walker(), rangeTableEntry_used_context::rt_index, and rangeTableEntry_used_context::sublevels_up.
Referenced by fireRIRrules(), matchLocks(), rewriteRuleAction(), and transformRuleStmt().
{ rangeTableEntry_used_context context; context.rt_index = rt_index; context.sublevels_up = sublevels_up; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ return query_or_expression_tree_walker(node, rangeTableEntry_used_walker, (void *) &context, 0); }
Node* replace_rte_variables | ( | Node * | node, | |
int | target_varno, | |||
int | sublevels_up, | |||
replace_rte_variables_callback | callback, | |||
void * | callback_arg, | |||
bool * | outer_hasSubLinks | |||
) |
Definition at line 1100 of file rewriteManip.c.
References replace_rte_variables_context::callback, replace_rte_variables_context::callback_arg, elog, ERROR, replace_rte_variables_context::inserted_sublink, IsA, query_or_expression_tree_mutator(), replace_rte_variables_mutator(), replace_rte_variables_context::sublevels_up, and replace_rte_variables_context::target_varno.
Referenced by pullup_replace_vars(), pullup_replace_vars_subquery(), and ReplaceVarsFromTargetList().
{ Node *result; replace_rte_variables_context context; context.callback = callback; context.callback_arg = callback_arg; context.target_varno = target_varno; context.sublevels_up = sublevels_up; /* * We try to initialize inserted_sublink to true if there is no need to * detect new sublinks because the query already has some. */ if (node && IsA(node, Query)) context.inserted_sublink = ((Query *) node)->hasSubLinks; else if (outer_hasSubLinks) context.inserted_sublink = *outer_hasSubLinks; else context.inserted_sublink = false; /* * Must be prepared to start with a Query or a bare expression tree; if * it's a Query, we don't want to increment sublevels_up. */ result = query_or_expression_tree_mutator(node, replace_rte_variables_mutator, (void *) &context, 0); if (context.inserted_sublink) { if (result && IsA(result, Query)) ((Query *) result)->hasSubLinks = true; else if (outer_hasSubLinks) *outer_hasSubLinks = true; else elog(ERROR, "replace_rte_variables inserted a SubLink, but has noplace to record it"); } return result; }
Node* replace_rte_variables_mutator | ( | Node * | node, | |
replace_rte_variables_context * | context | |||
) |
Definition at line 1147 of file rewriteManip.c.
References replace_rte_variables_context::callback, checkExprHasSubLink(), CurrentOfExpr::cvarno, ereport, errcode(), errmsg(), ERROR, expression_tree_mutator(), Query::hasSubLinks, replace_rte_variables_context::inserted_sublink, IsA, NULL, query_tree_mutator(), replace_rte_variables_mutator(), replace_rte_variables_context::sublevels_up, replace_rte_variables_context::target_varno, Var::varlevelsup, and Var::varno.
Referenced by pullup_replace_vars_callback(), replace_rte_variables(), replace_rte_variables_mutator(), and ReplaceVarsFromTargetList_callback().
{ if (node == NULL) return NULL; if (IsA(node, Var)) { Var *var = (Var *) node; if (var->varno == context->target_varno && var->varlevelsup == context->sublevels_up) { /* Found a matching variable, make the substitution */ Node *newnode; newnode = (*context->callback) (var, context); /* Detect if we are adding a sublink to query */ if (!context->inserted_sublink) context->inserted_sublink = checkExprHasSubLink(newnode); return newnode; } /* otherwise fall through to copy the var normally */ } else if (IsA(node, CurrentOfExpr)) { CurrentOfExpr *cexpr = (CurrentOfExpr *) node; if (cexpr->cvarno == context->target_varno && context->sublevels_up == 0) { /* * We get here if a WHERE CURRENT OF expression turns out to apply * to a view. Someday we might be able to translate the * expression to apply to an underlying table of the view, but * right now it's not implemented. */ ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("WHERE CURRENT OF on a view is not implemented"))); } /* otherwise fall through to copy the expr normally */ } else if (IsA(node, Query)) { /* Recurse into RTE subquery or not-yet-planned sublink subquery */ Query *newnode; bool save_inserted_sublink; context->sublevels_up++; save_inserted_sublink = context->inserted_sublink; context->inserted_sublink = ((Query *) node)->hasSubLinks; newnode = query_tree_mutator((Query *) node, replace_rte_variables_mutator, (void *) context, 0); newnode->hasSubLinks |= context->inserted_sublink; context->inserted_sublink = save_inserted_sublink; context->sublevels_up--; return (Node *) newnode; } return expression_tree_mutator(node, replace_rte_variables_mutator, (void *) context); }
Node* ReplaceVarsFromTargetList | ( | Node * | node, | |
int | target_varno, | |||
int | sublevels_up, | |||
RangeTblEntry * | target_rte, | |||
List * | targetlist, | |||
ReplaceVarsNoMatchOption | nomatch_option, | |||
int | nomatch_varno, | |||
bool * | outer_hasSubLinks | |||
) |
Definition at line 1441 of file rewriteManip.c.
References ReplaceVarsFromTargetList_context::nomatch_option, ReplaceVarsFromTargetList_context::nomatch_varno, replace_rte_variables(), ReplaceVarsFromTargetList_callback(), ReplaceVarsFromTargetList_context::target_rte, and ReplaceVarsFromTargetList_context::targetlist.
Referenced by CopyAndAddInvertedQual(), rewriteRuleAction(), rewriteTargetView(), and subquery_push_qual().
{ ReplaceVarsFromTargetList_context context; context.target_rte = target_rte; context.targetlist = targetlist; context.nomatch_option = nomatch_option; context.nomatch_varno = nomatch_varno; return replace_rte_variables(node, target_varno, sublevels_up, ReplaceVarsFromTargetList_callback, (void *) &context, outer_hasSubLinks); }