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e4e60e7b61
If we use a PlaceHolderVar from the outer relation in an inner indexscan, we need to reference the PlaceHolderVar as such as the value to be passed in from the outer relation. The previous code effectively tried to reconstruct the PHV from its component expression, which doesn't work since (a) the Vars therein aren't necessarily bubbled up far enough, and (b) it would be the wrong semantics anyway because of the possibility that the PHV is supposed to have gone to null at some point before the current join. Point (a) led to "variable not found in subplan target list" planner errors, but point (b) would have led to silently wrong answers. Per report from Roger Niederland.
38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* subselect.h
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/optimizer/subselect.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SUBSELECT_H
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#define SUBSELECT_H
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#include "nodes/plannodes.h"
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#include "nodes/relation.h"
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extern void SS_process_ctes(PlannerInfo *root);
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extern JoinExpr *convert_ANY_sublink_to_join(PlannerInfo *root,
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SubLink *sublink,
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Relids available_rels);
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extern JoinExpr *convert_EXISTS_sublink_to_join(PlannerInfo *root,
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SubLink *sublink,
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bool under_not,
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Relids available_rels);
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extern Node *SS_replace_correlation_vars(PlannerInfo *root, Node *expr);
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extern Node *SS_process_sublinks(PlannerInfo *root, Node *expr, bool isQual);
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extern void SS_finalize_plan(PlannerInfo *root, Plan *plan,
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bool attach_initplans);
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extern Param *SS_make_initplan_from_plan(PlannerInfo *root, Plan *plan,
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Oid resulttype, int32 resulttypmod, Oid resultcollation);
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extern Param *assign_nestloop_param_var(PlannerInfo *root, Var *var);
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extern Param *assign_nestloop_param_placeholdervar(PlannerInfo *root,
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PlaceHolderVar *phv);
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extern int SS_assign_special_param(PlannerInfo *root);
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#endif /* SUBSELECT_H */
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