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Fix the plan-invalidation mechanism to treat regclass constants that refer to
a relation as a reason to invalidate a plan when the relation changes. This
handles scenarios such as dropping/recreating a sequence that is referenced by
nextval('seq') in a cached plan. Rather than teach plancache.c all about
digging through plan trees to find regclass Consts, we charge the planner's
setrefs.c with making a list of the relation OIDs on which each plan depends.
That way the list can be built cheaply during a plan tree traversal that has
to happen anyway. Per bug #3662 and subsequent discussion.
This commit is contained in:
Tom Lane
@ -2,19 +2,20 @@
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*
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* setrefs.c
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* Post-processing of a completed plan tree: fix references to subplan
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* vars, and compute regproc values for operators
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* vars, compute regproc values for operators, etc
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*
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* Portions Copyright (c) 1996-2007, 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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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.136 2007/06/11 01:16:23 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.137 2007/10/11 18:05:27 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "catalog/pg_type.h"
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#include "nodes/makefuncs.h"
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#include "optimizer/clauses.h"
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#include "optimizer/planmain.h"
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@ -42,11 +43,13 @@ typedef struct
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typedef struct
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{
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PlannerGlobal *glob;
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int rtoffset;
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} fix_scan_expr_context;
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typedef struct
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{
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PlannerGlobal *glob;
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indexed_tlist *outer_itlist;
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indexed_tlist *inner_itlist;
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Index acceptable_rel;
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@ -55,24 +58,25 @@ typedef struct
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typedef struct
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{
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PlannerGlobal *glob;
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indexed_tlist *subplan_itlist;
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int rtoffset;
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} fix_upper_expr_context;
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#define fix_scan_list(lst, rtoffset) \
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((List *) fix_scan_expr((Node *) (lst), rtoffset))
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#define fix_scan_list(glob, lst, rtoffset) \
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((List *) fix_scan_expr(glob, (Node *) (lst), rtoffset))
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static Plan *set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset);
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static Plan *set_subqueryscan_references(PlannerGlobal *glob,
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SubqueryScan *plan,
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int rtoffset);
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static bool trivial_subqueryscan(SubqueryScan *plan);
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static Node *fix_scan_expr(Node *node, int rtoffset);
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static Node *fix_scan_expr(PlannerGlobal *glob, Node *node, int rtoffset);
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static Node *fix_scan_expr_mutator(Node *node, fix_scan_expr_context *context);
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static void set_join_references(Join *join, int rtoffset);
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static void set_inner_join_references(Plan *inner_plan,
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static void set_join_references(PlannerGlobal *glob, Join *join, int rtoffset);
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static void set_inner_join_references(PlannerGlobal *glob, Plan *inner_plan,
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indexed_tlist *outer_itlist);
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static void set_upper_references(Plan *plan, int rtoffset);
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static void set_upper_references(PlannerGlobal *glob, Plan *plan, int rtoffset);
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static void set_dummy_tlist_references(Plan *plan, int rtoffset);
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static indexed_tlist *build_tlist_index(List *tlist);
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static Var *search_indexed_tlist_for_var(Var *var,
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@ -82,13 +86,15 @@ static Var *search_indexed_tlist_for_var(Var *var,
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static Var *search_indexed_tlist_for_non_var(Node *node,
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indexed_tlist *itlist,
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Index newvarno);
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static List *fix_join_expr(List *clauses,
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static List *fix_join_expr(PlannerGlobal *glob,
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List *clauses,
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indexed_tlist *outer_itlist,
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indexed_tlist *inner_itlist,
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Index acceptable_rel, int rtoffset);
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static Node *fix_join_expr_mutator(Node *node,
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fix_join_expr_context *context);
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static Node *fix_upper_expr(Node *node,
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static Node *fix_upper_expr(PlannerGlobal *glob,
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Node *node,
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indexed_tlist *subplan_itlist,
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int rtoffset);
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static Node *fix_upper_expr_mutator(Node *node,
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@ -120,6 +126,11 @@ static bool fix_opfuncids_walker(Node *node, void *context);
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* 4. We compute regproc OIDs for operators (ie, we look up the function
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* that implements each op).
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*
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* 5. We create a list of OIDs of relations that the plan depends on.
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* This will be used by plancache.c to drive invalidation of cached plans.
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* (Someday we might want to generalize this to include other types of
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* objects, but for now tracking relations seems to solve most problems.)
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*
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* We also perform one final optimization step, which is to delete
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* SubqueryScan plan nodes that aren't doing anything useful (ie, have
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* no qual and a no-op targetlist). The reason for doing this last is that
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@ -128,7 +139,7 @@ static bool fix_opfuncids_walker(Node *node, void *context);
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* wouldn't match up with the Vars in the outer plan tree. The SubqueryScan
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* serves a necessary function as a buffer between outer query and subquery
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* variable numbering ... but after we've flattened the rangetable this is
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* no longer a problem, since there's only one rtindex namespace.
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* no longer a problem, since then there's only one rtindex namespace.
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*
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* set_plan_references recursively traverses the whole plan tree.
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*
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@ -140,7 +151,8 @@ static bool fix_opfuncids_walker(Node *node, void *context);
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* The return value is normally the same Plan node passed in, but can be
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* different when the passed-in Plan is a SubqueryScan we decide isn't needed.
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*
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* The flattened rangetable entries are appended to glob->finalrtable.
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* The flattened rangetable entries are appended to glob->finalrtable, and
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* the list of relation OIDs is appended to glob->relationOids.
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*
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* Notice that we modify Plan nodes in-place, but use expression_tree_mutator
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* to process targetlist and qual expressions. We can assume that the Plan
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@ -177,6 +189,22 @@ set_plan_references(PlannerGlobal *glob, Plan *plan, List *rtable)
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newrte->joinaliasvars = NIL;
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glob->finalrtable = lappend(glob->finalrtable, newrte);
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/*
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* If it's a plain relation RTE, add the table to relationOids.
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*
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* We do this even though the RTE might be unreferenced in the
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* plan tree; this would correspond to cases such as views that
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* were expanded, child tables that were eliminated by constraint
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* exclusion, etc. Schema invalidation on such a rel must still
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* force rebuilding of the plan.
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*
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* Note we don't bother to avoid duplicate list entries. We could,
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* but it would probably cost more cycles than it would save.
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*/
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if (newrte->rtekind == RTE_RELATION)
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glob->relationOids = lappend_oid(glob->relationOids,
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newrte->relid);
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}
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/* Now fix the Plan tree */
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@ -205,9 +233,9 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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splan->scanrelid += rtoffset;
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splan->plan.targetlist =
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fix_scan_list(splan->plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->plan.targetlist, rtoffset);
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splan->plan.qual =
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fix_scan_list(splan->plan.qual, rtoffset);
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fix_scan_list(glob, splan->plan.qual, rtoffset);
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}
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break;
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case T_IndexScan:
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@ -216,13 +244,13 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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splan->scan.scanrelid += rtoffset;
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splan->scan.plan.targetlist =
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fix_scan_list(splan->scan.plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->scan.plan.targetlist, rtoffset);
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splan->scan.plan.qual =
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fix_scan_list(splan->scan.plan.qual, rtoffset);
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fix_scan_list(glob, splan->scan.plan.qual, rtoffset);
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splan->indexqual =
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fix_scan_list(splan->indexqual, rtoffset);
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fix_scan_list(glob, splan->indexqual, rtoffset);
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splan->indexqualorig =
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fix_scan_list(splan->indexqualorig, rtoffset);
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fix_scan_list(glob, splan->indexqualorig, rtoffset);
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}
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break;
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case T_BitmapIndexScan:
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@ -234,9 +262,9 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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Assert(splan->scan.plan.targetlist == NIL);
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Assert(splan->scan.plan.qual == NIL);
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splan->indexqual =
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fix_scan_list(splan->indexqual, rtoffset);
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fix_scan_list(glob, splan->indexqual, rtoffset);
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splan->indexqualorig =
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fix_scan_list(splan->indexqualorig, rtoffset);
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fix_scan_list(glob, splan->indexqualorig, rtoffset);
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}
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break;
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case T_BitmapHeapScan:
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@ -245,11 +273,11 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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splan->scan.scanrelid += rtoffset;
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splan->scan.plan.targetlist =
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fix_scan_list(splan->scan.plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->scan.plan.targetlist, rtoffset);
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splan->scan.plan.qual =
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fix_scan_list(splan->scan.plan.qual, rtoffset);
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fix_scan_list(glob, splan->scan.plan.qual, rtoffset);
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splan->bitmapqualorig =
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fix_scan_list(splan->bitmapqualorig, rtoffset);
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fix_scan_list(glob, splan->bitmapqualorig, rtoffset);
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}
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break;
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case T_TidScan:
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@ -258,11 +286,11 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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splan->scan.scanrelid += rtoffset;
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splan->scan.plan.targetlist =
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fix_scan_list(splan->scan.plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->scan.plan.targetlist, rtoffset);
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splan->scan.plan.qual =
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fix_scan_list(splan->scan.plan.qual, rtoffset);
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fix_scan_list(glob, splan->scan.plan.qual, rtoffset);
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splan->tidquals =
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fix_scan_list(splan->tidquals, rtoffset);
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fix_scan_list(glob, splan->tidquals, rtoffset);
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}
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break;
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case T_SubqueryScan:
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@ -276,11 +304,11 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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splan->scan.scanrelid += rtoffset;
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splan->scan.plan.targetlist =
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fix_scan_list(splan->scan.plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->scan.plan.targetlist, rtoffset);
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splan->scan.plan.qual =
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fix_scan_list(splan->scan.plan.qual, rtoffset);
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fix_scan_list(glob, splan->scan.plan.qual, rtoffset);
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splan->funcexpr =
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fix_scan_expr(splan->funcexpr, rtoffset);
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fix_scan_expr(glob, splan->funcexpr, rtoffset);
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}
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break;
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case T_ValuesScan:
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@ -289,18 +317,18 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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splan->scan.scanrelid += rtoffset;
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splan->scan.plan.targetlist =
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fix_scan_list(splan->scan.plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->scan.plan.targetlist, rtoffset);
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splan->scan.plan.qual =
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fix_scan_list(splan->scan.plan.qual, rtoffset);
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fix_scan_list(glob, splan->scan.plan.qual, rtoffset);
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splan->values_lists =
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fix_scan_list(splan->values_lists, rtoffset);
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fix_scan_list(glob, splan->values_lists, rtoffset);
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}
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break;
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case T_NestLoop:
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case T_MergeJoin:
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case T_HashJoin:
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set_join_references((Join *) plan, rtoffset);
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set_join_references(glob, (Join *) plan, rtoffset);
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break;
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case T_Hash:
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@ -337,14 +365,14 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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Assert(splan->plan.qual == NIL);
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splan->limitOffset =
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fix_scan_expr(splan->limitOffset, rtoffset);
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fix_scan_expr(glob, splan->limitOffset, rtoffset);
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splan->limitCount =
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fix_scan_expr(splan->limitCount, rtoffset);
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fix_scan_expr(glob, splan->limitCount, rtoffset);
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}
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break;
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case T_Agg:
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case T_Group:
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set_upper_references(plan, rtoffset);
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set_upper_references(glob, plan, rtoffset);
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break;
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case T_Result:
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{
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@ -355,17 +383,17 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
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* like a scan node than an upper node.
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*/
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if (splan->plan.lefttree != NULL)
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set_upper_references(plan, rtoffset);
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set_upper_references(glob, plan, rtoffset);
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else
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{
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splan->plan.targetlist =
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fix_scan_list(splan->plan.targetlist, rtoffset);
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fix_scan_list(glob, splan->plan.targetlist, rtoffset);
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splan->plan.qual =
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fix_scan_list(splan->plan.qual, rtoffset);
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fix_scan_list(glob, splan->plan.qual, rtoffset);
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}
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/* resconstantqual can't contain any subplan variable refs */
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splan->resconstantqual =
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fix_scan_expr(splan->resconstantqual, rtoffset);
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fix_scan_expr(glob, splan->resconstantqual, rtoffset);
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}
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break;
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case T_Append:
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@ -497,9 +525,9 @@ set_subqueryscan_references(PlannerGlobal *glob,
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*/
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plan->scan.scanrelid += rtoffset;
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plan->scan.plan.targetlist =
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fix_scan_list(plan->scan.plan.targetlist, rtoffset);
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fix_scan_list(glob, plan->scan.plan.targetlist, rtoffset);
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plan->scan.plan.qual =
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fix_scan_list(plan->scan.plan.qual, rtoffset);
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fix_scan_list(glob, plan->scan.plan.qual, rtoffset);
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result = (Plan *) plan;
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}
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@ -585,14 +613,16 @@ copyVar(Var *var)
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* fix_scan_expr
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* Do set_plan_references processing on a scan-level expression
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*
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* This consists of incrementing all Vars' varnos by rtoffset and
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* looking up operator opcode info for OpExpr and related nodes.
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* This consists of incrementing all Vars' varnos by rtoffset,
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* looking up operator opcode info for OpExpr and related nodes,
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* and adding OIDs from regclass Const nodes into glob->relationOids.
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*/
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static Node *
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fix_scan_expr(Node *node, int rtoffset)
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fix_scan_expr(PlannerGlobal *glob, Node *node, int rtoffset)
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{
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fix_scan_expr_context context;
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context.glob = glob;
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context.rtoffset = rtoffset;
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return fix_scan_expr_mutator(node, &context);
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}
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@ -639,6 +669,17 @@ fix_scan_expr_mutator(Node *node, fix_scan_expr_context *context)
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set_opfuncid((OpExpr *) node); /* rely on struct equivalence */
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else if (IsA(node, ScalarArrayOpExpr))
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set_sa_opfuncid((ScalarArrayOpExpr *) node);
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else if (IsA(node, Const))
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{
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Const *con = (Const *) node;
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/* Check for regclass reference */
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if (con->consttype == REGCLASSOID && !con->constisnull)
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context->glob->relationOids =
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lappend_oid(context->glob->relationOids,
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DatumGetObjectId(con->constvalue));
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/* Fall through to let expression_tree_mutator copy it */
|
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}
|
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return expression_tree_mutator(node, fix_scan_expr_mutator,
|
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(void *) context);
|
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}
|
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@ -649,14 +690,14 @@ fix_scan_expr_mutator(Node *node, fix_scan_expr_context *context)
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* subplans, by setting the varnos to OUTER or INNER and setting attno
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* values to the result domain number of either the corresponding outer
|
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* or inner join tuple item. Also perform opcode lookup for these
|
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* expressions.
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* expressions. and add regclass OIDs to glob->relationOids.
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*
|
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* In the case of a nestloop with inner indexscan, we will also need to
|
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* apply the same transformation to any outer vars appearing in the
|
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* quals of the child indexscan. set_inner_join_references does that.
|
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*/
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static void
|
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set_join_references(Join *join, int rtoffset)
|
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set_join_references(PlannerGlobal *glob, Join *join, int rtoffset)
|
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{
|
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Plan *outer_plan = join->plan.lefttree;
|
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Plan *inner_plan = join->plan.righttree;
|
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@ -667,17 +708,20 @@ set_join_references(Join *join, int rtoffset)
|
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inner_itlist = build_tlist_index(inner_plan->targetlist);
|
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|
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/* All join plans have tlist, qual, and joinqual */
|
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join->plan.targetlist = fix_join_expr(join->plan.targetlist,
|
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join->plan.targetlist = fix_join_expr(glob,
|
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join->plan.targetlist,
|
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outer_itlist,
|
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inner_itlist,
|
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(Index) 0,
|
||||
rtoffset);
|
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join->plan.qual = fix_join_expr(join->plan.qual,
|
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join->plan.qual = fix_join_expr(glob,
|
||||
join->plan.qual,
|
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outer_itlist,
|
||||
inner_itlist,
|
||||
(Index) 0,
|
||||
rtoffset);
|
||||
join->joinqual = fix_join_expr(join->joinqual,
|
||||
join->joinqual = fix_join_expr(glob,
|
||||
join->joinqual,
|
||||
outer_itlist,
|
||||
inner_itlist,
|
||||
(Index) 0,
|
||||
@ -687,13 +731,14 @@ set_join_references(Join *join, int rtoffset)
|
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if (IsA(join, NestLoop))
|
||||
{
|
||||
/* This processing is split out to handle possible recursion */
|
||||
set_inner_join_references(inner_plan, outer_itlist);
|
||||
set_inner_join_references(glob, inner_plan, outer_itlist);
|
||||
}
|
||||
else if (IsA(join, MergeJoin))
|
||||
{
|
||||
MergeJoin *mj = (MergeJoin *) join;
|
||||
|
||||
mj->mergeclauses = fix_join_expr(mj->mergeclauses,
|
||||
mj->mergeclauses = fix_join_expr(glob,
|
||||
mj->mergeclauses,
|
||||
outer_itlist,
|
||||
inner_itlist,
|
||||
(Index) 0,
|
||||
@ -703,7 +748,8 @@ set_join_references(Join *join, int rtoffset)
|
||||
{
|
||||
HashJoin *hj = (HashJoin *) join;
|
||||
|
||||
hj->hashclauses = fix_join_expr(hj->hashclauses,
|
||||
hj->hashclauses = fix_join_expr(glob,
|
||||
hj->hashclauses,
|
||||
outer_itlist,
|
||||
inner_itlist,
|
||||
(Index) 0,
|
||||
@ -728,7 +774,8 @@ set_join_references(Join *join, int rtoffset)
|
||||
* recursion reaches the inner indexscan, and so we'd have done it twice.
|
||||
*/
|
||||
static void
|
||||
set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
set_inner_join_references(PlannerGlobal *glob, Plan *inner_plan,
|
||||
indexed_tlist *outer_itlist)
|
||||
{
|
||||
if (IsA(inner_plan, IndexScan))
|
||||
{
|
||||
@ -747,12 +794,14 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
Index innerrel = innerscan->scan.scanrelid;
|
||||
|
||||
/* only refs to outer vars get changed in the inner qual */
|
||||
innerscan->indexqualorig = fix_join_expr(indexqualorig,
|
||||
innerscan->indexqualorig = fix_join_expr(glob,
|
||||
indexqualorig,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
0);
|
||||
innerscan->indexqual = fix_join_expr(innerscan->indexqual,
|
||||
innerscan->indexqual = fix_join_expr(glob,
|
||||
innerscan->indexqual,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
@ -764,7 +813,8 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
* may get rechecked as qpquals).
|
||||
*/
|
||||
if (NumRelids((Node *) inner_plan->qual) > 1)
|
||||
inner_plan->qual = fix_join_expr(inner_plan->qual,
|
||||
inner_plan->qual = fix_join_expr(glob,
|
||||
inner_plan->qual,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
@ -785,12 +835,14 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
Index innerrel = innerscan->scan.scanrelid;
|
||||
|
||||
/* only refs to outer vars get changed in the inner qual */
|
||||
innerscan->indexqualorig = fix_join_expr(indexqualorig,
|
||||
innerscan->indexqualorig = fix_join_expr(glob,
|
||||
indexqualorig,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
0);
|
||||
innerscan->indexqual = fix_join_expr(innerscan->indexqual,
|
||||
innerscan->indexqual = fix_join_expr(glob,
|
||||
innerscan->indexqual,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
@ -814,7 +866,8 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
|
||||
/* only refs to outer vars get changed in the inner qual */
|
||||
if (NumRelids((Node *) bitmapqualorig) > 1)
|
||||
innerscan->bitmapqualorig = fix_join_expr(bitmapqualorig,
|
||||
innerscan->bitmapqualorig = fix_join_expr(glob,
|
||||
bitmapqualorig,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
@ -826,14 +879,15 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
* get rechecked as qpquals).
|
||||
*/
|
||||
if (NumRelids((Node *) inner_plan->qual) > 1)
|
||||
inner_plan->qual = fix_join_expr(inner_plan->qual,
|
||||
inner_plan->qual = fix_join_expr(glob,
|
||||
inner_plan->qual,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
0);
|
||||
|
||||
/* Now recurse */
|
||||
set_inner_join_references(inner_plan->lefttree, outer_itlist);
|
||||
set_inner_join_references(glob, inner_plan->lefttree, outer_itlist);
|
||||
}
|
||||
else if (IsA(inner_plan, BitmapAnd))
|
||||
{
|
||||
@ -843,7 +897,7 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
|
||||
foreach(l, innerscan->bitmapplans)
|
||||
{
|
||||
set_inner_join_references((Plan *) lfirst(l), outer_itlist);
|
||||
set_inner_join_references(glob, (Plan *) lfirst(l), outer_itlist);
|
||||
}
|
||||
}
|
||||
else if (IsA(inner_plan, BitmapOr))
|
||||
@ -854,7 +908,7 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
|
||||
foreach(l, innerscan->bitmapplans)
|
||||
{
|
||||
set_inner_join_references((Plan *) lfirst(l), outer_itlist);
|
||||
set_inner_join_references(glob, (Plan *) lfirst(l), outer_itlist);
|
||||
}
|
||||
}
|
||||
else if (IsA(inner_plan, TidScan))
|
||||
@ -862,7 +916,8 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
TidScan *innerscan = (TidScan *) inner_plan;
|
||||
Index innerrel = innerscan->scan.scanrelid;
|
||||
|
||||
innerscan->tidquals = fix_join_expr(innerscan->tidquals,
|
||||
innerscan->tidquals = fix_join_expr(glob,
|
||||
innerscan->tidquals,
|
||||
outer_itlist,
|
||||
NULL,
|
||||
innerrel,
|
||||
@ -879,7 +934,7 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
|
||||
foreach(l, appendplan->appendplans)
|
||||
{
|
||||
set_inner_join_references((Plan *) lfirst(l), outer_itlist);
|
||||
set_inner_join_references(glob, (Plan *) lfirst(l), outer_itlist);
|
||||
}
|
||||
}
|
||||
else if (IsA(inner_plan, Result))
|
||||
@ -888,7 +943,7 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
Result *result = (Result *) inner_plan;
|
||||
|
||||
if (result->plan.lefttree)
|
||||
set_inner_join_references(result->plan.lefttree, outer_itlist);
|
||||
set_inner_join_references(glob, result->plan.lefttree, outer_itlist);
|
||||
}
|
||||
}
|
||||
|
||||
@ -896,7 +951,8 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
* set_upper_references
|
||||
* Update the targetlist and quals of an upper-level plan node
|
||||
* to refer to the tuples returned by its lefttree subplan.
|
||||
* Also perform opcode lookup for these expressions.
|
||||
* Also perform opcode lookup for these expressions, and
|
||||
* add regclass OIDs to glob->relationOids.
|
||||
*
|
||||
* This is used for single-input plan types like Agg, Group, Result.
|
||||
*
|
||||
@ -910,7 +966,7 @@ set_inner_join_references(Plan *inner_plan, indexed_tlist *outer_itlist)
|
||||
* the expression.
|
||||
*/
|
||||
static void
|
||||
set_upper_references(Plan *plan, int rtoffset)
|
||||
set_upper_references(PlannerGlobal *glob, Plan *plan, int rtoffset)
|
||||
{
|
||||
Plan *subplan = plan->lefttree;
|
||||
indexed_tlist *subplan_itlist;
|
||||
@ -925,7 +981,8 @@ set_upper_references(Plan *plan, int rtoffset)
|
||||
TargetEntry *tle = (TargetEntry *) lfirst(l);
|
||||
Node *newexpr;
|
||||
|
||||
newexpr = fix_upper_expr((Node *) tle->expr,
|
||||
newexpr = fix_upper_expr(glob,
|
||||
(Node *) tle->expr,
|
||||
subplan_itlist,
|
||||
rtoffset);
|
||||
tle = flatCopyTargetEntry(tle);
|
||||
@ -935,7 +992,8 @@ set_upper_references(Plan *plan, int rtoffset)
|
||||
plan->targetlist = output_targetlist;
|
||||
|
||||
plan->qual = (List *)
|
||||
fix_upper_expr((Node *) plan->qual,
|
||||
fix_upper_expr(glob,
|
||||
(Node *) plan->qual,
|
||||
subplan_itlist,
|
||||
rtoffset);
|
||||
|
||||
@ -1166,7 +1224,8 @@ search_indexed_tlist_for_non_var(Node *node,
|
||||
* Create a new set of targetlist entries or join qual clauses by
|
||||
* changing the varno/varattno values of variables in the clauses
|
||||
* to reference target list values from the outer and inner join
|
||||
* relation target lists. Also perform opcode lookup.
|
||||
* relation target lists. Also perform opcode lookup and add
|
||||
* regclass OIDs to glob->relationOids.
|
||||
*
|
||||
* This is used in two different scenarios: a normal join clause, where
|
||||
* all the Vars in the clause *must* be replaced by OUTER or INNER references;
|
||||
@ -1192,7 +1251,8 @@ search_indexed_tlist_for_non_var(Node *node,
|
||||
* not modified.
|
||||
*/
|
||||
static List *
|
||||
fix_join_expr(List *clauses,
|
||||
fix_join_expr(PlannerGlobal *glob,
|
||||
List *clauses,
|
||||
indexed_tlist *outer_itlist,
|
||||
indexed_tlist *inner_itlist,
|
||||
Index acceptable_rel,
|
||||
@ -1200,6 +1260,7 @@ fix_join_expr(List *clauses,
|
||||
{
|
||||
fix_join_expr_context context;
|
||||
|
||||
context.glob = glob;
|
||||
context.outer_itlist = outer_itlist;
|
||||
context.inner_itlist = inner_itlist;
|
||||
context.acceptable_rel = acceptable_rel;
|
||||
@ -1276,6 +1337,17 @@ fix_join_expr_mutator(Node *node, fix_join_expr_context *context)
|
||||
set_opfuncid((OpExpr *) node); /* rely on struct equivalence */
|
||||
else if (IsA(node, ScalarArrayOpExpr))
|
||||
set_sa_opfuncid((ScalarArrayOpExpr *) node);
|
||||
else if (IsA(node, Const))
|
||||
{
|
||||
Const *con = (Const *) node;
|
||||
|
||||
/* Check for regclass reference */
|
||||
if (con->consttype == REGCLASSOID && !con->constisnull)
|
||||
context->glob->relationOids =
|
||||
lappend_oid(context->glob->relationOids,
|
||||
DatumGetObjectId(con->constvalue));
|
||||
/* Fall through to let expression_tree_mutator copy it */
|
||||
}
|
||||
return expression_tree_mutator(node,
|
||||
fix_join_expr_mutator,
|
||||
(void *) context);
|
||||
@ -1284,7 +1356,8 @@ fix_join_expr_mutator(Node *node, fix_join_expr_context *context)
|
||||
/*
|
||||
* fix_upper_expr
|
||||
* Modifies an expression tree so that all Var nodes reference outputs
|
||||
* of a subplan. Also performs opcode lookup.
|
||||
* of a subplan. Also performs opcode lookup, and adds regclass OIDs to
|
||||
* glob->relationOids.
|
||||
*
|
||||
* This is used to fix up target and qual expressions of non-join upper-level
|
||||
* plan nodes.
|
||||
@ -1308,12 +1381,14 @@ fix_join_expr_mutator(Node *node, fix_join_expr_context *context)
|
||||
* The original tree is not modified.
|
||||
*/
|
||||
static Node *
|
||||
fix_upper_expr(Node *node,
|
||||
fix_upper_expr(PlannerGlobal *glob,
|
||||
Node *node,
|
||||
indexed_tlist *subplan_itlist,
|
||||
int rtoffset)
|
||||
{
|
||||
fix_upper_expr_context context;
|
||||
|
||||
context.glob = glob;
|
||||
context.subplan_itlist = subplan_itlist;
|
||||
context.rtoffset = rtoffset;
|
||||
return fix_upper_expr_mutator(node, &context);
|
||||
@ -1359,6 +1434,17 @@ fix_upper_expr_mutator(Node *node, fix_upper_expr_context *context)
|
||||
set_opfuncid((OpExpr *) node); /* rely on struct equivalence */
|
||||
else if (IsA(node, ScalarArrayOpExpr))
|
||||
set_sa_opfuncid((ScalarArrayOpExpr *) node);
|
||||
else if (IsA(node, Const))
|
||||
{
|
||||
Const *con = (Const *) node;
|
||||
|
||||
/* Check for regclass reference */
|
||||
if (con->consttype == REGCLASSOID && !con->constisnull)
|
||||
context->glob->relationOids =
|
||||
lappend_oid(context->glob->relationOids,
|
||||
DatumGetObjectId(con->constvalue));
|
||||
/* Fall through to let expression_tree_mutator copy it */
|
||||
}
|
||||
return expression_tree_mutator(node,
|
||||
fix_upper_expr_mutator,
|
||||
(void *) context);
|
||||
@ -1376,7 +1462,8 @@ fix_upper_expr_mutator(Node *node, fix_upper_expr_context *context)
|
||||
* adjusted RETURNING list, result-table Vars will still have their
|
||||
* original varno, but Vars for other rels will have varno OUTER.
|
||||
*
|
||||
* We also must perform opcode lookup.
|
||||
* We also must perform opcode lookup and add regclass OIDs to
|
||||
* glob->relationOids.
|
||||
*
|
||||
* 'rlist': the RETURNING targetlist to be fixed
|
||||
* 'topplan': the top Plan node for the query (not yet passed through
|
||||
@ -1387,7 +1474,8 @@ fix_upper_expr_mutator(Node *node, fix_upper_expr_context *context)
|
||||
* they are not coming from a subplan.
|
||||
*/
|
||||
List *
|
||||
set_returning_clause_references(List *rlist,
|
||||
set_returning_clause_references(PlannerGlobal *glob,
|
||||
List *rlist,
|
||||
Plan *topplan,
|
||||
Index resultRelation)
|
||||
{
|
||||
@ -1402,7 +1490,8 @@ set_returning_clause_references(List *rlist,
|
||||
*/
|
||||
itlist = build_tlist_index_other_vars(topplan->targetlist, resultRelation);
|
||||
|
||||
rlist = fix_join_expr(rlist,
|
||||
rlist = fix_join_expr(glob,
|
||||
rlist,
|
||||
itlist,
|
||||
NULL,
|
||||
resultRelation,
|
||||
|
||||
Reference in New Issue
Block a user