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431178ae67
slot of the topmost plan node when a trigger returns a modified tuple. These appear to be the only places where a plan node's caller did not treat the result slot as read-only, which is an assumption that nodeUnique makes as of 8.1. Fixes trigger-vs-DISTINCT bug reported by Frank van Vugt.
1069 lines
29 KiB
C
1069 lines
29 KiB
C
/*-------------------------------------------------------------------------
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*
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* execUtils.c
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* miscellaneous executor utility routines
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*
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* Portions Copyright (c) 1996-2005, 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/executor/execUtils.c,v 1.126.2.1 2005/11/14 17:43:13 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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/*
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* INTERFACE ROUTINES
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* CreateExecutorState Create/delete executor working state
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* FreeExecutorState
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* CreateExprContext
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* FreeExprContext
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* ReScanExprContext
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*
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* ExecAssignExprContext Common code for plan node init routines.
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* ExecAssignResultType
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* etc
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*
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* ExecOpenIndices \
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* ExecCloseIndices | referenced by InitPlan, EndPlan,
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* ExecInsertIndexTuples / ExecInsert, ExecUpdate
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*
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* RegisterExprContextCallback Register function shutdown callback
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* UnregisterExprContextCallback Deregister function shutdown callback
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*
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* NOTES
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* This file has traditionally been the place to stick misc.
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* executor support stuff that doesn't really go anyplace else.
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*/
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#include "postgres.h"
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#include "access/genam.h"
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#include "access/heapam.h"
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#include "catalog/index.h"
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#include "catalog/catalog.h"
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#include "catalog/pg_index.h"
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#include "executor/execdebug.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/fmgroids.h"
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#include "utils/memutils.h"
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#include "utils/relcache.h"
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#include "utils/syscache.h"
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/* ----------------------------------------------------------------
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* global counters for number of tuples processed, retrieved,
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* appended, replaced, deleted.
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* ----------------------------------------------------------------
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*/
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int NTupleProcessed;
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int NTupleRetrieved;
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int NTupleReplaced;
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int NTupleAppended;
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int NTupleDeleted;
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int NIndexTupleInserted;
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extern int NIndexTupleProcessed; /* have to be defined in the access
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* method level so that the
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* cinterface.a will link ok. */
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static void ShutdownExprContext(ExprContext *econtext);
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/* ----------------------------------------------------------------
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* statistic functions
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* ----------------------------------------------------------------
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*/
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/* ----------------------------------------------------------------
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* ResetTupleCount
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* ----------------------------------------------------------------
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*/
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#ifdef NOT_USED
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void
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ResetTupleCount(void)
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{
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NTupleProcessed = 0;
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NTupleRetrieved = 0;
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NTupleAppended = 0;
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NTupleDeleted = 0;
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NTupleReplaced = 0;
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NIndexTupleProcessed = 0;
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}
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#endif
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/* ----------------------------------------------------------------
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* PrintTupleCount
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* ----------------------------------------------------------------
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*/
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#ifdef NOT_USED
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void
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DisplayTupleCount(FILE *statfp)
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{
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if (NTupleProcessed > 0)
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fprintf(statfp, "!\t%d tuple%s processed, ", NTupleProcessed,
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(NTupleProcessed == 1) ? "" : "s");
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else
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{
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fprintf(statfp, "!\tno tuples processed.\n");
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return;
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}
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if (NIndexTupleProcessed > 0)
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fprintf(statfp, "%d indextuple%s processed, ", NIndexTupleProcessed,
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(NIndexTupleProcessed == 1) ? "" : "s");
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if (NIndexTupleInserted > 0)
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fprintf(statfp, "%d indextuple%s inserted, ", NIndexTupleInserted,
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(NIndexTupleInserted == 1) ? "" : "s");
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if (NTupleRetrieved > 0)
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fprintf(statfp, "%d tuple%s retrieved. ", NTupleRetrieved,
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(NTupleRetrieved == 1) ? "" : "s");
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if (NTupleAppended > 0)
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fprintf(statfp, "%d tuple%s appended. ", NTupleAppended,
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(NTupleAppended == 1) ? "" : "s");
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if (NTupleDeleted > 0)
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fprintf(statfp, "%d tuple%s deleted. ", NTupleDeleted,
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(NTupleDeleted == 1) ? "" : "s");
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if (NTupleReplaced > 0)
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fprintf(statfp, "%d tuple%s replaced. ", NTupleReplaced,
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(NTupleReplaced == 1) ? "" : "s");
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fprintf(statfp, "\n");
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}
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#endif
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/* ----------------------------------------------------------------
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* Executor state and memory management functions
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* ----------------------------------------------------------------
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*/
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/* ----------------
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* CreateExecutorState
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*
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* Create and initialize an EState node, which is the root of
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* working storage for an entire Executor invocation.
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*
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* Principally, this creates the per-query memory context that will be
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* used to hold all working data that lives till the end of the query.
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* Note that the per-query context will become a child of the caller's
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* CurrentMemoryContext.
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* ----------------
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*/
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EState *
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CreateExecutorState(void)
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{
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EState *estate;
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MemoryContext qcontext;
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MemoryContext oldcontext;
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/*
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* Create the per-query context for this Executor run.
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*/
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qcontext = AllocSetContextCreate(CurrentMemoryContext,
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"ExecutorState",
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ALLOCSET_DEFAULT_MINSIZE,
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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/*
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* Make the EState node within the per-query context. This way, we don't
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* need a separate pfree() operation for it at shutdown.
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*/
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oldcontext = MemoryContextSwitchTo(qcontext);
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estate = makeNode(EState);
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/*
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* Initialize all fields of the Executor State structure
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*/
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estate->es_direction = ForwardScanDirection;
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estate->es_snapshot = SnapshotNow;
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estate->es_crosscheck_snapshot = InvalidSnapshot; /* no crosscheck */
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estate->es_range_table = NIL;
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estate->es_result_relations = NULL;
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estate->es_num_result_relations = 0;
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estate->es_result_relation_info = NULL;
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estate->es_junkFilter = NULL;
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estate->es_trig_tuple_slot = NULL;
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estate->es_into_relation_descriptor = NULL;
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estate->es_into_relation_use_wal = false;
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estate->es_param_list_info = NULL;
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estate->es_param_exec_vals = NULL;
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estate->es_query_cxt = qcontext;
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estate->es_tupleTable = NULL;
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estate->es_processed = 0;
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estate->es_lastoid = InvalidOid;
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estate->es_rowMarks = NIL;
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estate->es_forUpdate = false;
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estate->es_rowNoWait = false;
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estate->es_instrument = false;
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estate->es_select_into = false;
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estate->es_into_oids = false;
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estate->es_exprcontexts = NIL;
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estate->es_per_tuple_exprcontext = NULL;
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estate->es_topPlan = NULL;
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estate->es_evalPlanQual = NULL;
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estate->es_evTupleNull = NULL;
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estate->es_evTuple = NULL;
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estate->es_useEvalPlan = false;
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/*
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* Return the executor state structure
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*/
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MemoryContextSwitchTo(oldcontext);
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return estate;
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}
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/* ----------------
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* FreeExecutorState
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*
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* Release an EState along with all remaining working storage.
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*
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* Note: this is not responsible for releasing non-memory resources,
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* such as open relations or buffer pins. But it will shut down any
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* still-active ExprContexts within the EState. That is sufficient
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* cleanup for situations where the EState has only been used for expression
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* evaluation, and not to run a complete Plan.
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*
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* This can be called in any memory context ... so long as it's not one
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* of the ones to be freed.
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* ----------------
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*/
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void
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FreeExecutorState(EState *estate)
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{
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/*
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* Shut down and free any remaining ExprContexts. We do this explicitly
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* to ensure that any remaining shutdown callbacks get called (since they
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* might need to release resources that aren't simply memory within the
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* per-query memory context).
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*/
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while (estate->es_exprcontexts)
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{
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/*
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* XXX: seems there ought to be a faster way to implement this than
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* repeated list_delete(), no?
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*/
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FreeExprContext((ExprContext *) linitial(estate->es_exprcontexts));
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/* FreeExprContext removed the list link for us */
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}
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/*
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* Free the per-query memory context, thereby releasing all working
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* memory, including the EState node itself.
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*/
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MemoryContextDelete(estate->es_query_cxt);
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}
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/* ----------------
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* CreateExprContext
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*
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* Create a context for expression evaluation within an EState.
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*
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* An executor run may require multiple ExprContexts (we usually make one
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* for each Plan node, and a separate one for per-output-tuple processing
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* such as constraint checking). Each ExprContext has its own "per-tuple"
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* memory context.
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*
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* Note we make no assumption about the caller's memory context.
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* ----------------
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*/
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ExprContext *
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CreateExprContext(EState *estate)
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{
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ExprContext *econtext;
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MemoryContext oldcontext;
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/* Create the ExprContext node within the per-query memory context */
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oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
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econtext = makeNode(ExprContext);
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/* Initialize fields of ExprContext */
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econtext->ecxt_scantuple = NULL;
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econtext->ecxt_innertuple = NULL;
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econtext->ecxt_outertuple = NULL;
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econtext->ecxt_per_query_memory = estate->es_query_cxt;
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/*
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* Create working memory for expression evaluation in this context.
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*/
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econtext->ecxt_per_tuple_memory =
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AllocSetContextCreate(estate->es_query_cxt,
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"ExprContext",
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ALLOCSET_DEFAULT_MINSIZE,
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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econtext->ecxt_param_exec_vals = estate->es_param_exec_vals;
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econtext->ecxt_param_list_info = estate->es_param_list_info;
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econtext->ecxt_aggvalues = NULL;
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econtext->ecxt_aggnulls = NULL;
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econtext->caseValue_datum = (Datum) 0;
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econtext->caseValue_isNull = true;
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econtext->domainValue_datum = (Datum) 0;
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econtext->domainValue_isNull = true;
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econtext->ecxt_estate = estate;
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econtext->ecxt_callbacks = NULL;
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/*
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* Link the ExprContext into the EState to ensure it is shut down when the
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* EState is freed. Because we use lcons(), shutdowns will occur in
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* reverse order of creation, which may not be essential but can't hurt.
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*/
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estate->es_exprcontexts = lcons(econtext, estate->es_exprcontexts);
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MemoryContextSwitchTo(oldcontext);
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return econtext;
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}
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/* ----------------
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* FreeExprContext
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*
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* Free an expression context, including calling any remaining
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* shutdown callbacks.
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*
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* Since we free the temporary context used for expression evaluation,
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* any previously computed pass-by-reference expression result will go away!
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*
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* Note we make no assumption about the caller's memory context.
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* ----------------
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*/
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void
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FreeExprContext(ExprContext *econtext)
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{
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EState *estate;
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/* Call any registered callbacks */
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ShutdownExprContext(econtext);
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/* And clean up the memory used */
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MemoryContextDelete(econtext->ecxt_per_tuple_memory);
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/* Unlink self from owning EState */
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estate = econtext->ecxt_estate;
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estate->es_exprcontexts = list_delete_ptr(estate->es_exprcontexts, econtext);
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/* And delete the ExprContext node */
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pfree(econtext);
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}
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/*
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* ReScanExprContext
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*
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* Reset an expression context in preparation for a rescan of its
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* plan node. This requires calling any registered shutdown callbacks,
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* since any partially complete set-returning-functions must be canceled.
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*
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* Note we make no assumption about the caller's memory context.
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*/
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void
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ReScanExprContext(ExprContext *econtext)
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{
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/* Call any registered callbacks */
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ShutdownExprContext(econtext);
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/* And clean up the memory used */
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MemoryContextReset(econtext->ecxt_per_tuple_memory);
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}
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/*
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* Build a per-output-tuple ExprContext for an EState.
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*
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* This is normally invoked via GetPerTupleExprContext() macro,
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* not directly.
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*/
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ExprContext *
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MakePerTupleExprContext(EState *estate)
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{
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if (estate->es_per_tuple_exprcontext == NULL)
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estate->es_per_tuple_exprcontext = CreateExprContext(estate);
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return estate->es_per_tuple_exprcontext;
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}
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|
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/* ----------------------------------------------------------------
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* miscellaneous node-init support functions
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*
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* Note: all of these are expected to be called with CurrentMemoryContext
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* equal to the per-query memory context.
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* ----------------------------------------------------------------
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*/
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/* ----------------
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* ExecAssignExprContext
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*
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* This initializes the ps_ExprContext field. It is only necessary
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* to do this for nodes which use ExecQual or ExecProject
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* because those routines require an econtext. Other nodes that
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* don't have to evaluate expressions don't need to do this.
|
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* ----------------
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*/
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void
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ExecAssignExprContext(EState *estate, PlanState *planstate)
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{
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planstate->ps_ExprContext = CreateExprContext(estate);
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}
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|
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/* ----------------
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* ExecAssignResultType
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* ----------------
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*/
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void
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ExecAssignResultType(PlanState *planstate,
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TupleDesc tupDesc, bool shouldFree)
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{
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TupleTableSlot *slot = planstate->ps_ResultTupleSlot;
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ExecSetSlotDescriptor(slot, tupDesc, shouldFree);
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}
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|
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/* ----------------
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* ExecAssignResultTypeFromOuterPlan
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* ----------------
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*/
|
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void
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ExecAssignResultTypeFromOuterPlan(PlanState *planstate)
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{
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PlanState *outerPlan;
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TupleDesc tupDesc;
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outerPlan = outerPlanState(planstate);
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tupDesc = ExecGetResultType(outerPlan);
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ExecAssignResultType(planstate, tupDesc, false);
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}
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|
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/* ----------------
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* ExecAssignResultTypeFromTL
|
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* ----------------
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*/
|
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void
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ExecAssignResultTypeFromTL(PlanState *planstate)
|
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{
|
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bool hasoid;
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TupleDesc tupDesc;
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|
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if (ExecContextForcesOids(planstate, &hasoid))
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{
|
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/* context forces OID choice; hasoid is now set correctly */
|
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}
|
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else
|
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{
|
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/* given free choice, don't leave space for OIDs in result tuples */
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hasoid = false;
|
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}
|
|
|
|
/*
|
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* ExecTypeFromTL needs the parse-time representation of the tlist, not a
|
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* list of ExprStates. This is good because some plan nodes don't bother
|
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* to set up planstate->targetlist ...
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*/
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tupDesc = ExecTypeFromTL(planstate->plan->targetlist, hasoid);
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ExecAssignResultType(planstate, tupDesc, true);
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}
|
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|
|
/* ----------------
|
|
* ExecGetResultType
|
|
* ----------------
|
|
*/
|
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TupleDesc
|
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ExecGetResultType(PlanState *planstate)
|
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{
|
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TupleTableSlot *slot = planstate->ps_ResultTupleSlot;
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|
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return slot->tts_tupleDescriptor;
|
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}
|
|
|
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/* ----------------
|
|
* ExecBuildProjectionInfo
|
|
*
|
|
* Build a ProjectionInfo node for evaluating the given tlist in the given
|
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* econtext, and storing the result into the tuple slot. (Caller must have
|
|
* ensured that tuple slot has a descriptor matching the tlist!) Note that
|
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* the given tlist should be a list of ExprState nodes, not Expr nodes.
|
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* ----------------
|
|
*/
|
|
ProjectionInfo *
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ExecBuildProjectionInfo(List *targetList,
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ExprContext *econtext,
|
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TupleTableSlot *slot)
|
|
{
|
|
ProjectionInfo *projInfo = makeNode(ProjectionInfo);
|
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int len;
|
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bool isVarList;
|
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ListCell *tl;
|
|
|
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len = ExecTargetListLength(targetList);
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|
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projInfo->pi_targetlist = targetList;
|
|
projInfo->pi_exprContext = econtext;
|
|
projInfo->pi_slot = slot;
|
|
|
|
/*
|
|
* Determine whether the target list consists entirely of simple Var
|
|
* references (ie, references to non-system attributes). If so, we can
|
|
* use the simpler ExecVariableList instead of ExecTargetList.
|
|
*/
|
|
isVarList = true;
|
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foreach(tl, targetList)
|
|
{
|
|
GenericExprState *gstate = (GenericExprState *) lfirst(tl);
|
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Var *variable = (Var *) gstate->arg->expr;
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|
|
if (variable == NULL ||
|
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!IsA(variable, Var) ||
|
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variable->varattno <= 0)
|
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{
|
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isVarList = false;
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break;
|
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}
|
|
}
|
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projInfo->pi_isVarList = isVarList;
|
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|
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if (isVarList)
|
|
{
|
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int *varSlotOffsets;
|
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int *varNumbers;
|
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AttrNumber lastInnerVar = 0;
|
|
AttrNumber lastOuterVar = 0;
|
|
AttrNumber lastScanVar = 0;
|
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|
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projInfo->pi_itemIsDone = NULL; /* not needed */
|
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projInfo->pi_varSlotOffsets = varSlotOffsets = (int *)
|
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palloc0(len * sizeof(int));
|
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projInfo->pi_varNumbers = varNumbers = (int *)
|
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palloc0(len * sizeof(int));
|
|
|
|
/*
|
|
* Set up the data needed by ExecVariableList. The slots in which the
|
|
* variables can be found at runtime are denoted by the offsets of
|
|
* their slot pointers within the econtext. This rather grotty
|
|
* representation is needed because the caller may not have given us
|
|
* the real econtext yet (see hacks in nodeSubplan.c).
|
|
*/
|
|
foreach(tl, targetList)
|
|
{
|
|
GenericExprState *gstate = (GenericExprState *) lfirst(tl);
|
|
Var *variable = (Var *) gstate->arg->expr;
|
|
AttrNumber attnum = variable->varattno;
|
|
TargetEntry *tle = (TargetEntry *) gstate->xprstate.expr;
|
|
AttrNumber resind = tle->resno - 1;
|
|
|
|
Assert(resind >= 0 && resind < len);
|
|
varNumbers[resind] = attnum;
|
|
|
|
switch (variable->varno)
|
|
{
|
|
case INNER:
|
|
varSlotOffsets[resind] = offsetof(ExprContext,
|
|
ecxt_innertuple);
|
|
lastInnerVar = Max(lastInnerVar, attnum);
|
|
break;
|
|
|
|
case OUTER:
|
|
varSlotOffsets[resind] = offsetof(ExprContext,
|
|
ecxt_outertuple);
|
|
lastOuterVar = Max(lastOuterVar, attnum);
|
|
break;
|
|
|
|
default:
|
|
varSlotOffsets[resind] = offsetof(ExprContext,
|
|
ecxt_scantuple);
|
|
lastScanVar = Max(lastScanVar, attnum);
|
|
break;
|
|
}
|
|
}
|
|
projInfo->pi_lastInnerVar = lastInnerVar;
|
|
projInfo->pi_lastOuterVar = lastOuterVar;
|
|
projInfo->pi_lastScanVar = lastScanVar;
|
|
}
|
|
else
|
|
{
|
|
projInfo->pi_itemIsDone = (ExprDoneCond *)
|
|
palloc(len * sizeof(ExprDoneCond));
|
|
projInfo->pi_varSlotOffsets = NULL;
|
|
projInfo->pi_varNumbers = NULL;
|
|
}
|
|
|
|
return projInfo;
|
|
}
|
|
|
|
/* ----------------
|
|
* ExecAssignProjectionInfo
|
|
*
|
|
* forms the projection information from the node's targetlist
|
|
* ----------------
|
|
*/
|
|
void
|
|
ExecAssignProjectionInfo(PlanState *planstate)
|
|
{
|
|
planstate->ps_ProjInfo =
|
|
ExecBuildProjectionInfo(planstate->targetlist,
|
|
planstate->ps_ExprContext,
|
|
planstate->ps_ResultTupleSlot);
|
|
}
|
|
|
|
|
|
/* ----------------
|
|
* ExecFreeExprContext
|
|
*
|
|
* A plan node's ExprContext should be freed explicitly during executor
|
|
* shutdown because there may be shutdown callbacks to call. (Other resources
|
|
* made by the above routines, such as projection info, don't need to be freed
|
|
* explicitly because they're just memory in the per-query memory context.)
|
|
*
|
|
* However ... there is no particular need to do it during ExecEndNode,
|
|
* because FreeExecutorState will free any remaining ExprContexts within
|
|
* the EState. Letting FreeExecutorState do it allows the ExprContexts to
|
|
* be freed in reverse order of creation, rather than order of creation as
|
|
* will happen if we delete them here, which saves O(N^2) work in the list
|
|
* cleanup inside FreeExprContext.
|
|
* ----------------
|
|
*/
|
|
void
|
|
ExecFreeExprContext(PlanState *planstate)
|
|
{
|
|
/*
|
|
* Per above discussion, don't actually delete the ExprContext. We do
|
|
* unlink it from the plan node, though.
|
|
*/
|
|
planstate->ps_ExprContext = NULL;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* the following scan type support functions are for
|
|
* those nodes which are stubborn and return tuples in
|
|
* their Scan tuple slot instead of their Result tuple
|
|
* slot.. luck fur us, these nodes do not do projections
|
|
* so we don't have to worry about getting the ProjectionInfo
|
|
* right for them... -cim 6/3/91
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* ----------------
|
|
* ExecGetScanType
|
|
* ----------------
|
|
*/
|
|
TupleDesc
|
|
ExecGetScanType(ScanState *scanstate)
|
|
{
|
|
TupleTableSlot *slot = scanstate->ss_ScanTupleSlot;
|
|
|
|
return slot->tts_tupleDescriptor;
|
|
}
|
|
|
|
/* ----------------
|
|
* ExecAssignScanType
|
|
* ----------------
|
|
*/
|
|
void
|
|
ExecAssignScanType(ScanState *scanstate,
|
|
TupleDesc tupDesc, bool shouldFree)
|
|
{
|
|
TupleTableSlot *slot = scanstate->ss_ScanTupleSlot;
|
|
|
|
ExecSetSlotDescriptor(slot, tupDesc, shouldFree);
|
|
}
|
|
|
|
/* ----------------
|
|
* ExecAssignScanTypeFromOuterPlan
|
|
* ----------------
|
|
*/
|
|
void
|
|
ExecAssignScanTypeFromOuterPlan(ScanState *scanstate)
|
|
{
|
|
PlanState *outerPlan;
|
|
TupleDesc tupDesc;
|
|
|
|
outerPlan = outerPlanState(scanstate);
|
|
tupDesc = ExecGetResultType(outerPlan);
|
|
|
|
ExecAssignScanType(scanstate, tupDesc, false);
|
|
}
|
|
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecInsertIndexTuples support
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecOpenIndices
|
|
*
|
|
* Find the indices associated with a result relation, open them,
|
|
* and save information about them in the result ResultRelInfo.
|
|
*
|
|
* At entry, caller has already opened and locked
|
|
* resultRelInfo->ri_RelationDesc.
|
|
*
|
|
* This used to be horribly ugly code, and slow too because it
|
|
* did a sequential scan of pg_index. Now we rely on the relcache
|
|
* to cache a list of the OIDs of the indices associated with any
|
|
* specific relation, and we use the pg_index syscache to get the
|
|
* entries we need from pg_index.
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
void
|
|
ExecOpenIndices(ResultRelInfo *resultRelInfo)
|
|
{
|
|
Relation resultRelation = resultRelInfo->ri_RelationDesc;
|
|
List *indexoidlist;
|
|
ListCell *l;
|
|
int len,
|
|
i;
|
|
RelationPtr relationDescs;
|
|
IndexInfo **indexInfoArray;
|
|
|
|
resultRelInfo->ri_NumIndices = 0;
|
|
|
|
/* fast path if no indexes */
|
|
if (!RelationGetForm(resultRelation)->relhasindex)
|
|
return;
|
|
|
|
/*
|
|
* Get cached list of index OIDs
|
|
*/
|
|
indexoidlist = RelationGetIndexList(resultRelation);
|
|
len = list_length(indexoidlist);
|
|
if (len == 0)
|
|
return;
|
|
|
|
/*
|
|
* allocate space for result arrays
|
|
*/
|
|
relationDescs = (RelationPtr) palloc(len * sizeof(Relation));
|
|
indexInfoArray = (IndexInfo **) palloc(len * sizeof(IndexInfo *));
|
|
|
|
resultRelInfo->ri_NumIndices = len;
|
|
resultRelInfo->ri_IndexRelationDescs = relationDescs;
|
|
resultRelInfo->ri_IndexRelationInfo = indexInfoArray;
|
|
|
|
/*
|
|
* For each index, open the index relation and save pg_index info.
|
|
*/
|
|
i = 0;
|
|
foreach(l, indexoidlist)
|
|
{
|
|
Oid indexOid = lfirst_oid(l);
|
|
Relation indexDesc;
|
|
IndexInfo *ii;
|
|
|
|
/*
|
|
* Open and lock the index relation
|
|
*
|
|
* If the index AM supports concurrent updates, obtain RowExclusiveLock
|
|
* to signify that we are updating the index. This locks out only
|
|
* operations that need exclusive access, such as relocating the index
|
|
* to a new tablespace.
|
|
*
|
|
* If the index AM is not safe for concurrent updates, obtain an
|
|
* exclusive lock on the index to lock out other updaters as well as
|
|
* readers (index_beginscan places AccessShareLock).
|
|
*
|
|
* If there are multiple not-concurrent-safe indexes, all backends must
|
|
* lock the indexes in the same order or we will get deadlocks here.
|
|
* This is guaranteed by RelationGetIndexList(), which promises to
|
|
* return the index list in OID order.
|
|
*
|
|
* The locks will be released in ExecCloseIndices.
|
|
*/
|
|
indexDesc = index_open(indexOid);
|
|
|
|
if (indexDesc->rd_am->amconcurrent)
|
|
LockRelation(indexDesc, RowExclusiveLock);
|
|
else
|
|
LockRelation(indexDesc, AccessExclusiveLock);
|
|
|
|
/* extract index key information from the index's pg_index info */
|
|
ii = BuildIndexInfo(indexDesc);
|
|
|
|
relationDescs[i] = indexDesc;
|
|
indexInfoArray[i] = ii;
|
|
i++;
|
|
}
|
|
|
|
list_free(indexoidlist);
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecCloseIndices
|
|
*
|
|
* Close the index relations stored in resultRelInfo
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
void
|
|
ExecCloseIndices(ResultRelInfo *resultRelInfo)
|
|
{
|
|
int i;
|
|
int numIndices;
|
|
RelationPtr indexDescs;
|
|
|
|
numIndices = resultRelInfo->ri_NumIndices;
|
|
indexDescs = resultRelInfo->ri_IndexRelationDescs;
|
|
|
|
for (i = 0; i < numIndices; i++)
|
|
{
|
|
if (indexDescs[i] == NULL)
|
|
continue; /* shouldn't happen? */
|
|
|
|
/* Drop lock acquired by ExecOpenIndices */
|
|
if (indexDescs[i]->rd_am->amconcurrent)
|
|
UnlockRelation(indexDescs[i], RowExclusiveLock);
|
|
else
|
|
UnlockRelation(indexDescs[i], AccessExclusiveLock);
|
|
|
|
index_close(indexDescs[i]);
|
|
}
|
|
|
|
/*
|
|
* XXX should free indexInfo array here too? Currently we assume that
|
|
* such stuff will be cleaned up automatically in FreeExecutorState.
|
|
*/
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecInsertIndexTuples
|
|
*
|
|
* This routine takes care of inserting index tuples
|
|
* into all the relations indexing the result relation
|
|
* when a heap tuple is inserted into the result relation.
|
|
* Much of this code should be moved into the genam
|
|
* stuff as it only exists here because the genam stuff
|
|
* doesn't provide the functionality needed by the
|
|
* executor.. -cim 9/27/89
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
void
|
|
ExecInsertIndexTuples(TupleTableSlot *slot,
|
|
ItemPointer tupleid,
|
|
EState *estate,
|
|
bool is_vacuum)
|
|
{
|
|
ResultRelInfo *resultRelInfo;
|
|
int i;
|
|
int numIndices;
|
|
RelationPtr relationDescs;
|
|
Relation heapRelation;
|
|
IndexInfo **indexInfoArray;
|
|
ExprContext *econtext;
|
|
Datum values[INDEX_MAX_KEYS];
|
|
bool isnull[INDEX_MAX_KEYS];
|
|
|
|
/*
|
|
* Get information from the result relation info structure.
|
|
*/
|
|
resultRelInfo = estate->es_result_relation_info;
|
|
numIndices = resultRelInfo->ri_NumIndices;
|
|
relationDescs = resultRelInfo->ri_IndexRelationDescs;
|
|
indexInfoArray = resultRelInfo->ri_IndexRelationInfo;
|
|
heapRelation = resultRelInfo->ri_RelationDesc;
|
|
|
|
/*
|
|
* We will use the EState's per-tuple context for evaluating predicates
|
|
* and index expressions (creating it if it's not already there).
|
|
*/
|
|
econtext = GetPerTupleExprContext(estate);
|
|
|
|
/* Arrange for econtext's scan tuple to be the tuple under test */
|
|
econtext->ecxt_scantuple = slot;
|
|
|
|
/*
|
|
* for each index, form and insert the index tuple
|
|
*/
|
|
for (i = 0; i < numIndices; i++)
|
|
{
|
|
IndexInfo *indexInfo;
|
|
|
|
if (relationDescs[i] == NULL)
|
|
continue;
|
|
|
|
indexInfo = indexInfoArray[i];
|
|
|
|
/* Check for partial index */
|
|
if (indexInfo->ii_Predicate != NIL)
|
|
{
|
|
List *predicate;
|
|
|
|
/*
|
|
* If predicate state not set up yet, create it (in the estate's
|
|
* per-query context)
|
|
*/
|
|
predicate = indexInfo->ii_PredicateState;
|
|
if (predicate == NIL)
|
|
{
|
|
predicate = (List *)
|
|
ExecPrepareExpr((Expr *) indexInfo->ii_Predicate,
|
|
estate);
|
|
indexInfo->ii_PredicateState = predicate;
|
|
}
|
|
|
|
/* Skip this index-update if the predicate isn't satisfied */
|
|
if (!ExecQual(predicate, econtext, false))
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* FormIndexDatum fills in its values and isnull parameters with the
|
|
* appropriate values for the column(s) of the index.
|
|
*/
|
|
FormIndexDatum(indexInfo,
|
|
slot,
|
|
estate,
|
|
values,
|
|
isnull);
|
|
|
|
/*
|
|
* The index AM does the rest. Note we suppress unique-index checks
|
|
* if we are being called from VACUUM, since VACUUM may need to move
|
|
* dead tuples that have the same keys as live ones.
|
|
*/
|
|
index_insert(relationDescs[i], /* index relation */
|
|
values, /* array of index Datums */
|
|
isnull, /* null flags */
|
|
tupleid, /* tid of heap tuple */
|
|
heapRelation,
|
|
relationDescs[i]->rd_index->indisunique && !is_vacuum);
|
|
|
|
/*
|
|
* keep track of index inserts for debugging
|
|
*/
|
|
IncrIndexInserted();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* UpdateChangedParamSet
|
|
* Add changed parameters to a plan node's chgParam set
|
|
*/
|
|
void
|
|
UpdateChangedParamSet(PlanState *node, Bitmapset *newchg)
|
|
{
|
|
Bitmapset *parmset;
|
|
|
|
/*
|
|
* The plan node only depends on params listed in its allParam set. Don't
|
|
* include anything else into its chgParam set.
|
|
*/
|
|
parmset = bms_intersect(node->plan->allParam, newchg);
|
|
|
|
/*
|
|
* Keep node->chgParam == NULL if there's not actually any members; this
|
|
* allows the simplest possible tests in executor node files.
|
|
*/
|
|
if (!bms_is_empty(parmset))
|
|
node->chgParam = bms_join(node->chgParam, parmset);
|
|
else
|
|
bms_free(parmset);
|
|
}
|
|
|
|
/*
|
|
* Register a shutdown callback in an ExprContext.
|
|
*
|
|
* Shutdown callbacks will be called (in reverse order of registration)
|
|
* when the ExprContext is deleted or rescanned. This provides a hook
|
|
* for functions called in the context to do any cleanup needed --- it's
|
|
* particularly useful for functions returning sets. Note that the
|
|
* callback will *not* be called in the event that execution is aborted
|
|
* by an error.
|
|
*/
|
|
void
|
|
RegisterExprContextCallback(ExprContext *econtext,
|
|
ExprContextCallbackFunction function,
|
|
Datum arg)
|
|
{
|
|
ExprContext_CB *ecxt_callback;
|
|
|
|
/* Save the info in appropriate memory context */
|
|
ecxt_callback = (ExprContext_CB *)
|
|
MemoryContextAlloc(econtext->ecxt_per_query_memory,
|
|
sizeof(ExprContext_CB));
|
|
|
|
ecxt_callback->function = function;
|
|
ecxt_callback->arg = arg;
|
|
|
|
/* link to front of list for appropriate execution order */
|
|
ecxt_callback->next = econtext->ecxt_callbacks;
|
|
econtext->ecxt_callbacks = ecxt_callback;
|
|
}
|
|
|
|
/*
|
|
* Deregister a shutdown callback in an ExprContext.
|
|
*
|
|
* Any list entries matching the function and arg will be removed.
|
|
* This can be used if it's no longer necessary to call the callback.
|
|
*/
|
|
void
|
|
UnregisterExprContextCallback(ExprContext *econtext,
|
|
ExprContextCallbackFunction function,
|
|
Datum arg)
|
|
{
|
|
ExprContext_CB **prev_callback;
|
|
ExprContext_CB *ecxt_callback;
|
|
|
|
prev_callback = &econtext->ecxt_callbacks;
|
|
|
|
while ((ecxt_callback = *prev_callback) != NULL)
|
|
{
|
|
if (ecxt_callback->function == function && ecxt_callback->arg == arg)
|
|
{
|
|
*prev_callback = ecxt_callback->next;
|
|
pfree(ecxt_callback);
|
|
}
|
|
else
|
|
prev_callback = &ecxt_callback->next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Call all the shutdown callbacks registered in an ExprContext.
|
|
*
|
|
* The callback list is emptied (important in case this is only a rescan
|
|
* reset, and not deletion of the ExprContext).
|
|
*/
|
|
static void
|
|
ShutdownExprContext(ExprContext *econtext)
|
|
{
|
|
ExprContext_CB *ecxt_callback;
|
|
MemoryContext oldcontext;
|
|
|
|
/* Fast path in normal case where there's nothing to do. */
|
|
if (econtext->ecxt_callbacks == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Call the callbacks in econtext's per-tuple context. This ensures that
|
|
* any memory they might leak will get cleaned up.
|
|
*/
|
|
oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
|
|
|
|
/*
|
|
* Call each callback function in reverse registration order.
|
|
*/
|
|
while ((ecxt_callback = econtext->ecxt_callbacks) != NULL)
|
|
{
|
|
econtext->ecxt_callbacks = ecxt_callback->next;
|
|
(*ecxt_callback->function) (ecxt_callback->arg);
|
|
pfree(ecxt_callback);
|
|
}
|
|
|
|
MemoryContextSwitchTo(oldcontext);
|
|
}
|