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1722d5eb05
As pointed out by Tom Lane, the patch introduced fragile and invasive
design around plan invalidation handling when locking of prunable
partitions was deferred from plancache.c to the executor. In
particular, it violated assumptions about CachedPlan immutability and
altered executor APIs in ways that are difficult to justify given the
added complexity and overhead.
This also removes the firstResultRels field added to PlannedStmt in
commit 28317de72, which was intended to support deferred locking of
certain ModifyTable result relations.
Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/605328.1747710381@sss.pgh.pa.us
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* execdesc.h
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* plan and query descriptor accessor macros used by the executor
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* and related modules.
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*
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*
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* Portions Copyright (c) 1996-2025, 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/executor/execdesc.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef EXECDESC_H
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#define EXECDESC_H
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#include "nodes/execnodes.h"
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#include "tcop/dest.h"
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/* ----------------
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* query descriptor:
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*
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* a QueryDesc encapsulates everything that the executor
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* needs to execute the query.
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*
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* For the convenience of SQL-language functions, we also support QueryDescs
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* containing utility statements; these must not be passed to the executor
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* however.
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* ---------------------
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*/
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typedef struct QueryDesc
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{
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/* These fields are provided by CreateQueryDesc */
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CmdType operation; /* CMD_SELECT, CMD_UPDATE, etc. */
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PlannedStmt *plannedstmt; /* planner's output (could be utility, too) */
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const char *sourceText; /* source text of the query */
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Snapshot snapshot; /* snapshot to use for query */
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Snapshot crosscheck_snapshot; /* crosscheck for RI update/delete */
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DestReceiver *dest; /* the destination for tuple output */
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ParamListInfo params; /* param values being passed in */
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QueryEnvironment *queryEnv; /* query environment passed in */
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int instrument_options; /* OR of InstrumentOption flags */
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/* These fields are set by ExecutorStart */
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TupleDesc tupDesc; /* descriptor for result tuples */
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EState *estate; /* executor's query-wide state */
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PlanState *planstate; /* tree of per-plan-node state */
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/* This field is set by ExecutePlan */
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bool already_executed; /* true if previously executed */
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/* This is always set NULL by the core system, but plugins can change it */
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struct Instrumentation *totaltime; /* total time spent in ExecutorRun */
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} QueryDesc;
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/* in pquery.c */
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extern QueryDesc *CreateQueryDesc(PlannedStmt *plannedstmt,
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const char *sourceText,
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Snapshot snapshot,
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Snapshot crosscheck_snapshot,
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DestReceiver *dest,
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ParamListInfo params,
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QueryEnvironment *queryEnv,
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int instrument_options);
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extern void FreeQueryDesc(QueryDesc *qdesc);
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#endif /* EXECDESC_H */
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