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1402 lines
35 KiB
C
1402 lines
35 KiB
C
/*-------------------------------------------------------------------------
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*
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* execMain.c--
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* top level executor interface routines
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*
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* INTERFACE ROUTINES
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* ExecutorStart()
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* ExecutorRun()
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* ExecutorEnd()
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*
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* The old ExecutorMain() has been replaced by ExecutorStart(),
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* ExecutorRun() and ExecutorEnd()
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*
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* These three procedures are the external interfaces to the executor.
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* In each case, the query descriptor and the execution state is required
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* as arguments
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*
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* ExecutorStart() must be called at the beginning of any execution of any
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* query plan and ExecutorEnd() should always be called at the end of
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* execution of a plan.
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*
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* ExecutorRun accepts 'feature' and 'count' arguments that specify whether
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* the plan is to be executed forwards, backwards, and for how many tuples.
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*
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* 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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* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.23 1997/09/07 04:41:18 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <string.h>
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#include "postgres.h"
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#include "miscadmin.h"
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#include "executor/executor.h"
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#include "executor/execdefs.h"
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#include "executor/execdebug.h"
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#include "executor/nodeIndexscan.h"
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#include "utils/builtins.h"
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#include "utils/palloc.h"
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#include "utils/acl.h"
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#include "utils/syscache.h"
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#include "parser/parsetree.h" /* rt_fetch() */
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#include "storage/bufmgr.h"
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#include "storage/lmgr.h"
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#include "storage/smgr.h"
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#include "commands/async.h"
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/* #include "access/localam.h" */
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#include "optimizer/var.h"
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#include "access/heapam.h"
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#include "catalog/heap.h"
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#include "commands/trigger.h"
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/* decls for local routines only used within this module */
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static void
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ExecCheckPerms(CmdType operation, int resultRelation, List * rangeTable,
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Query * parseTree);
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static TupleDesc
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InitPlan(CmdType operation, Query * parseTree,
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Plan * plan, EState * estate);
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static void EndPlan(Plan * plan, EState * estate);
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static TupleTableSlot *
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ExecutePlan(EState * estate, Plan * plan,
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Query * parseTree, CmdType operation,
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int numberTuples, ScanDirection direction,
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void (*printfunc) ());
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static void ExecRetrieve(TupleTableSlot * slot, void (*printfunc) (),
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EState * estate);
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static void
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ExecAppend(TupleTableSlot * slot, ItemPointer tupleid,
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EState * estate);
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static void
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ExecDelete(TupleTableSlot * slot, ItemPointer tupleid,
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EState * estate);
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static void
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ExecReplace(TupleTableSlot * slot, ItemPointer tupleid,
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EState * estate, Query * parseTree);
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/* end of local decls */
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#ifdef QUERY_LIMIT
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static int queryLimit = ALL_TUPLES;
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#undef ALL_TUPLES
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#define ALL_TUPLES queryLimit
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#ifdef NOT_USED
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int
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ExecutorLimit(int limit)
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{
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return queryLimit = limit;
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}
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#endif
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#endif
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/* ----------------------------------------------------------------
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* ExecutorStart
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*
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* This routine must be called at the beginning of any execution of any
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* query plan
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*
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* returns (AttrInfo*) which describes the attributes of the tuples to
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* be returned by the query.
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*
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* ----------------------------------------------------------------
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*/
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TupleDesc
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ExecutorStart(QueryDesc * queryDesc, EState * estate)
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{
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TupleDesc result;
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/* sanity checks */
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Assert(queryDesc != NULL);
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result = InitPlan(queryDesc->operation,
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queryDesc->parsetree,
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queryDesc->plantree,
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estate);
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/*
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* reset buffer refcount. the current refcounts are saved and will be
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* restored when ExecutorEnd is called
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*
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* this makes sure that when ExecutorRun's are called recursively as for
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* postquel functions, the buffers pinned by one ExecutorRun will not
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* be unpinned by another ExecutorRun.
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*/
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BufferRefCountReset(estate->es_refcount);
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return result;
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}
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/* ----------------------------------------------------------------
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* ExecutorRun
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*
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* This is the main routine of the executor module. It accepts
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* the query descriptor from the traffic cop and executes the
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* query plan.
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*
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* ExecutorStart must have been called already.
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*
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* the different features supported are:
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* EXEC_RUN: retrieve all tuples in the forward direction
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* EXEC_FOR: retrieve 'count' number of tuples in the forward dir
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* EXEC_BACK: retrieve 'count' number of tuples in the backward dir
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* EXEC_RETONE: return one tuple but don't 'retrieve' it
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* used in postquel function processing
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*
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*
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* ----------------------------------------------------------------
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*/
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TupleTableSlot *
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ExecutorRun(QueryDesc * queryDesc, EState * estate, int feature, int count)
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{
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CmdType operation;
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Query *parseTree;
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Plan *plan;
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TupleTableSlot *result;
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CommandDest dest;
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void (*destination) ();
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/* ----------------
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* sanity checks
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* ----------------
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*/
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Assert(queryDesc != NULL);
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/* ----------------
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* extract information from the query descriptor
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* and the query feature.
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* ----------------
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*/
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operation = queryDesc->operation;
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parseTree = queryDesc->parsetree;
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plan = queryDesc->plantree;
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dest = queryDesc->dest;
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destination = (void (*) ()) DestToFunction(dest);
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estate->es_processed = 0;
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estate->es_lastoid = InvalidOid;
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#if 0
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/*
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* It doesn't work in common case (i.g. if function has a aggregate).
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* Now we store parameter values before ExecutorStart. - vadim
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* 01/22/97
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*/
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#ifdef INDEXSCAN_PATCH
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/*
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* If the plan is an index scan and some of the scan key are function
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* arguments rescan the indices after the parameter values have been
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* stored in the execution state. DZ - 27-8-1996
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*/
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if ((nodeTag(plan) == T_IndexScan) &&
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(((IndexScan *) plan)->indxstate->iss_RuntimeKeyInfo != NULL))
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{
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ExprContext *econtext;
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econtext = ((IndexScan *) plan)->scan.scanstate->cstate.cs_ExprContext;
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ExecIndexReScan((IndexScan *) plan, econtext, plan);
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}
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#endif
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#endif
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switch (feature)
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{
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case EXEC_RUN:
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result = ExecutePlan(estate,
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plan,
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parseTree,
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operation,
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ALL_TUPLES,
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ForwardScanDirection,
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destination);
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break;
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case EXEC_FOR:
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result = ExecutePlan(estate,
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plan,
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parseTree,
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operation,
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count,
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ForwardScanDirection,
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destination);
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break;
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/* ----------------
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* retrieve next n "backward" tuples
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* ----------------
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*/
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case EXEC_BACK:
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result = ExecutePlan(estate,
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plan,
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parseTree,
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operation,
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count,
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BackwardScanDirection,
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destination);
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break;
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/* ----------------
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* return one tuple but don't "retrieve" it.
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* (this is used by the rule manager..) -cim 9/14/89
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* ----------------
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*/
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case EXEC_RETONE:
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result = ExecutePlan(estate,
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plan,
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parseTree,
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operation,
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ONE_TUPLE,
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ForwardScanDirection,
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destination);
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break;
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default:
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result = NULL;
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elog(DEBUG, "ExecutorRun: Unknown feature %d", feature);
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break;
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}
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return result;
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}
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/* ----------------------------------------------------------------
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* ExecutorEnd
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*
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* This routine must be called at the end of any execution of any
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* query plan
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*
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* returns (AttrInfo*) which describes the attributes of the tuples to
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* be returned by the query.
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*
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* ----------------------------------------------------------------
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*/
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void
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ExecutorEnd(QueryDesc * queryDesc, EState * estate)
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{
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/* sanity checks */
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Assert(queryDesc != NULL);
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EndPlan(queryDesc->plantree, estate);
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/* restore saved refcounts. */
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BufferRefCountRestore(estate->es_refcount);
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}
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/* ===============================================================
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* ===============================================================
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static routines follow
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* ===============================================================
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* ===============================================================
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*/
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static void
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ExecCheckPerms(CmdType operation,
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int resultRelation,
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List * rangeTable,
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Query * parseTree)
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{
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int i = 1;
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Oid relid;
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HeapTuple htp;
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List *lp;
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List *qvars,
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*tvars;
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int32 ok = 1,
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aclcheck_result = -1;
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char *opstr;
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NameData rname;
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char *userName;
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#define CHECK(MODE) pg_aclcheck(rname.data, userName, MODE)
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userName = GetPgUserName();
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foreach(lp, rangeTable)
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{
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RangeTblEntry *rte = lfirst(lp);
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relid = rte->relid;
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htp = SearchSysCacheTuple(RELOID,
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ObjectIdGetDatum(relid),
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0, 0, 0);
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if (!HeapTupleIsValid(htp))
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elog(WARN, "ExecCheckPerms: bogus RT relid: %d",
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relid);
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strNcpy(rname.data,
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((Form_pg_class) GETSTRUCT(htp))->relname.data,
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NAMEDATALEN - 1);
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if (i == resultRelation)
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{ /* this is the result relation */
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qvars = pull_varnos(parseTree->qual);
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tvars = pull_varnos((Node *) parseTree->targetList);
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if (intMember(resultRelation, qvars) ||
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intMember(resultRelation, tvars))
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{
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/* result relation is scanned */
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ok = ((aclcheck_result = CHECK(ACL_RD)) == ACLCHECK_OK);
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opstr = "read";
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if (!ok)
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break;
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}
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switch (operation)
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{
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case CMD_INSERT:
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ok = ((aclcheck_result = CHECK(ACL_AP)) == ACLCHECK_OK) ||
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((aclcheck_result = CHECK(ACL_WR)) == ACLCHECK_OK);
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opstr = "append";
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break;
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case CMD_NOTIFY: /* what does this mean?? -- jw, 1/6/94 */
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case CMD_DELETE:
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case CMD_UPDATE:
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ok = ((aclcheck_result = CHECK(ACL_WR)) == ACLCHECK_OK);
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opstr = "write";
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break;
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default:
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elog(WARN, "ExecCheckPerms: bogus operation %d",
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operation);
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}
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}
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else
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{
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/* XXX NOTIFY?? */
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ok = ((aclcheck_result = CHECK(ACL_RD)) == ACLCHECK_OK);
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opstr = "read";
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}
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if (!ok)
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break;
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++i;
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}
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if (!ok)
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{
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elog(WARN, "%s: %s", rname.data, aclcheck_error_strings[aclcheck_result]);
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}
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}
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/* ----------------------------------------------------------------
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* InitPlan
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*
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* Initializes the query plan: open files, allocate storage
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* and start up the rule manager
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* ----------------------------------------------------------------
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*/
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static TupleDesc
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InitPlan(CmdType operation, Query * parseTree, Plan * plan, EState * estate)
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{
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List *rangeTable;
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int resultRelation;
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Relation intoRelationDesc;
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TupleDesc tupType;
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List *targetList;
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int len;
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/* ----------------
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* get information from query descriptor
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* ----------------
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*/
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rangeTable = parseTree->rtable;
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resultRelation = parseTree->resultRelation;
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/* ----------------
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* initialize the node's execution state
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* ----------------
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*/
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estate->es_range_table = rangeTable;
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/* ----------------
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* initialize the BaseId counter so node base_id's
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* are assigned correctly. Someday baseid's will have to
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* be stored someplace other than estate because they
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* should be unique per query planned.
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* ----------------
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*/
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estate->es_BaseId = 1;
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/* ----------------
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* initialize result relation stuff
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* ----------------
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*/
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if (resultRelation != 0 && operation != CMD_SELECT)
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{
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/* ----------------
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* if we have a result relation, open it and
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* initialize the result relation info stuff.
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* ----------------
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*/
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RelationInfo *resultRelationInfo;
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Index resultRelationIndex;
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RangeTblEntry *rtentry;
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Oid resultRelationOid;
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Relation resultRelationDesc;
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resultRelationIndex = resultRelation;
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rtentry = rt_fetch(resultRelationIndex, rangeTable);
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resultRelationOid = rtentry->relid;
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resultRelationDesc = heap_open(resultRelationOid);
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if (resultRelationDesc->rd_rel->relkind == RELKIND_SEQUENCE)
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elog(WARN, "You can't change sequence relation %s",
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resultRelationDesc->rd_rel->relname.data);
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/*
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* Write-lock the result relation right away: if the relation is
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* used in a subsequent scan, we won't have to elevate the
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* read-lock set by heap_beginscan to a write-lock (needed by
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* heap_insert, heap_delete and heap_replace). This will hopefully
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* prevent some deadlocks. - 01/24/94
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*/
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RelationSetLockForWrite(resultRelationDesc);
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resultRelationInfo = makeNode(RelationInfo);
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resultRelationInfo->ri_RangeTableIndex = resultRelationIndex;
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resultRelationInfo->ri_RelationDesc = resultRelationDesc;
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resultRelationInfo->ri_NumIndices = 0;
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resultRelationInfo->ri_IndexRelationDescs = NULL;
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resultRelationInfo->ri_IndexRelationInfo = NULL;
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/* ----------------
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* open indices on result relation and save descriptors
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* in the result relation information..
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* ----------------
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*/
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ExecOpenIndices(resultRelationOid, resultRelationInfo);
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estate->es_result_relation_info = resultRelationInfo;
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}
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else
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{
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/* ----------------
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* if no result relation, then set state appropriately
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* ----------------
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*/
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estate->es_result_relation_info = NULL;
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}
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#ifndef NO_SECURITY
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ExecCheckPerms(operation, resultRelation, rangeTable, parseTree);
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#endif
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/* ----------------
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* initialize the executor "tuple" table.
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* ----------------
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*/
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{
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int nSlots = ExecCountSlotsNode(plan);
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TupleTable tupleTable = ExecCreateTupleTable(nSlots + 10); /* why add ten? - jolly */
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estate->es_tupleTable = tupleTable;
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}
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/* ----------------
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* initialize the private state information for
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* all the nodes in the query tree. This opens
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* files, allocates storage and leaves us ready
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* to start processing tuples..
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* ----------------
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*/
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ExecInitNode(plan, estate, NULL);
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/* ----------------
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* get the tuple descriptor describing the type
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* of tuples to return.. (this is especially important
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* if we are creating a relation with "retrieve into")
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* ----------------
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*/
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tupType = ExecGetTupType(plan); /* tuple descriptor */
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targetList = plan->targetlist;
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len = ExecTargetListLength(targetList); /* number of attributes */
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/* ----------------
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* now that we have the target list, initialize the junk filter
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* if this is a REPLACE or a DELETE query.
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* We also init the junk filter if this is an append query
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* (there might be some rule lock info there...)
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* NOTE: in the future we might want to initialize the junk
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* filter for all queries.
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* ----------------
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*/
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if (operation == CMD_UPDATE || operation == CMD_DELETE ||
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operation == CMD_INSERT)
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{
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JunkFilter *j = (JunkFilter *) ExecInitJunkFilter(targetList);
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estate->es_junkFilter = j;
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}
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else
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estate->es_junkFilter = NULL;
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|
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/* ----------------
|
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* initialize the "into" relation
|
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* ----------------
|
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*/
|
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intoRelationDesc = (Relation) NULL;
|
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|
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if (operation == CMD_SELECT)
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{
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char *intoName;
|
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char archiveMode;
|
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Oid intoRelationId;
|
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TupleDesc tupdesc;
|
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|
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if (!parseTree->isPortal)
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{
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|
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/*
|
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* a select into table
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*/
|
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if (parseTree->into != NULL)
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{
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/* ----------------
|
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* create the "into" relation
|
|
*
|
|
* note: there is currently no way for the user to
|
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* specify the desired archive mode of the
|
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* "into" relation...
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* ----------------
|
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*/
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intoName = parseTree->into;
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archiveMode = 'n';
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/*
|
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* have to copy tupType to get rid of constraints
|
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*/
|
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tupdesc = CreateTupleDescCopy(tupType);
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|
|
/* fixup to prevent zero-length columns in create */
|
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setVarAttrLenForCreateTable(tupdesc, targetList, rangeTable);
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|
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intoRelationId = heap_create(intoName,
|
|
intoName, /* not used */
|
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archiveMode,
|
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DEFAULT_SMGR,
|
|
tupdesc);
|
|
#ifdef NOT_USED /* it's copy ... */
|
|
resetVarAttrLenForCreateTable(tupdesc);
|
|
#endif
|
|
FreeTupleDesc(tupdesc);
|
|
|
|
/* ----------------
|
|
* XXX rather than having to call setheapoverride(true)
|
|
* and then back to false, we should change the
|
|
* arguments to heap_open() instead..
|
|
* ----------------
|
|
*/
|
|
setheapoverride(true);
|
|
|
|
intoRelationDesc = heap_open(intoRelationId);
|
|
|
|
setheapoverride(false);
|
|
}
|
|
}
|
|
}
|
|
|
|
estate->es_into_relation_descriptor = intoRelationDesc;
|
|
|
|
/* ----------------
|
|
* return the type information..
|
|
* ----------------
|
|
*/
|
|
/*
|
|
attinfo = (AttrInfo *)palloc(sizeof(AttrInfo));
|
|
attinfo->numAttr = len;
|
|
attinfo->attrs = tupType->attrs;
|
|
*/
|
|
|
|
return tupType;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* EndPlan
|
|
*
|
|
* Cleans up the query plan -- closes files and free up storages
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
static void
|
|
EndPlan(Plan * plan, EState * estate)
|
|
{
|
|
RelationInfo *resultRelationInfo;
|
|
Relation intoRelationDesc;
|
|
|
|
/* ----------------
|
|
* get information from state
|
|
* ----------------
|
|
*/
|
|
resultRelationInfo = estate->es_result_relation_info;
|
|
intoRelationDesc = estate->es_into_relation_descriptor;
|
|
|
|
/* ----------------
|
|
* shut down the query
|
|
* ----------------
|
|
*/
|
|
ExecEndNode(plan, plan);
|
|
|
|
/* ----------------
|
|
* destroy the executor "tuple" table.
|
|
* ----------------
|
|
*/
|
|
{
|
|
TupleTable tupleTable = (TupleTable) estate->es_tupleTable;
|
|
|
|
ExecDestroyTupleTable(tupleTable, true); /* was missing last arg */
|
|
estate->es_tupleTable = NULL;
|
|
}
|
|
|
|
/* ----------------
|
|
* close the result relations if necessary
|
|
* ----------------
|
|
*/
|
|
if (resultRelationInfo != NULL)
|
|
{
|
|
Relation resultRelationDesc;
|
|
|
|
resultRelationDesc = resultRelationInfo->ri_RelationDesc;
|
|
heap_close(resultRelationDesc);
|
|
|
|
/* ----------------
|
|
* close indices on the result relation
|
|
* ----------------
|
|
*/
|
|
ExecCloseIndices(resultRelationInfo);
|
|
}
|
|
|
|
/* ----------------
|
|
* close the "into" relation if necessary
|
|
* ----------------
|
|
*/
|
|
if (intoRelationDesc != NULL)
|
|
{
|
|
heap_close(intoRelationDesc);
|
|
}
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecutePlan
|
|
*
|
|
* processes the query plan to retrieve 'tupleCount' tuples in the
|
|
* direction specified.
|
|
* Retrieves all tuples if tupleCount is 0
|
|
*
|
|
* result is either a slot containing a tuple in the case
|
|
* of a RETRIEVE or NULL otherwise.
|
|
*
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
/* the ctid attribute is a 'junk' attribute that is removed before the
|
|
user can see it*/
|
|
|
|
static TupleTableSlot *
|
|
ExecutePlan(EState * estate,
|
|
Plan * plan,
|
|
Query * parseTree,
|
|
CmdType operation,
|
|
int numberTuples,
|
|
ScanDirection direction,
|
|
void (*printfunc) ())
|
|
{
|
|
JunkFilter *junkfilter;
|
|
|
|
TupleTableSlot *slot;
|
|
ItemPointer tupleid = NULL;
|
|
ItemPointerData tuple_ctid;
|
|
int current_tuple_count;
|
|
TupleTableSlot *result;
|
|
|
|
/* ----------------
|
|
* initialize local variables
|
|
* ----------------
|
|
*/
|
|
slot = NULL;
|
|
current_tuple_count = 0;
|
|
result = NULL;
|
|
|
|
/* ----------------
|
|
* Set the direction.
|
|
* ----------------
|
|
*/
|
|
estate->es_direction = direction;
|
|
|
|
/* ----------------
|
|
* Loop until we've processed the proper number
|
|
* of tuples from the plan..
|
|
* ----------------
|
|
*/
|
|
|
|
for (;;)
|
|
{
|
|
if (operation != CMD_NOTIFY)
|
|
{
|
|
/* ----------------
|
|
* Execute the plan and obtain a tuple
|
|
* ----------------
|
|
*/
|
|
/* at the top level, the parent of a plan (2nd arg) is itself */
|
|
slot = ExecProcNode(plan, plan);
|
|
|
|
/* ----------------
|
|
* if the tuple is null, then we assume
|
|
* there is nothing more to process so
|
|
* we just return null...
|
|
* ----------------
|
|
*/
|
|
if (TupIsNull(slot))
|
|
{
|
|
result = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* if we have a junk filter, then project a new
|
|
* tuple with the junk removed.
|
|
*
|
|
* Store this new "clean" tuple in the place of the
|
|
* original tuple.
|
|
*
|
|
* Also, extract all the junk ifnormation we need.
|
|
* ----------------
|
|
*/
|
|
if ((junkfilter = estate->es_junkFilter) != (JunkFilter *) NULL)
|
|
{
|
|
Datum datum;
|
|
|
|
/* NameData attrName; */
|
|
HeapTuple newTuple;
|
|
bool isNull;
|
|
|
|
/* ---------------
|
|
* extract the 'ctid' junk attribute.
|
|
* ---------------
|
|
*/
|
|
if (operation == CMD_UPDATE || operation == CMD_DELETE)
|
|
{
|
|
if (!ExecGetJunkAttribute(junkfilter,
|
|
slot,
|
|
"ctid",
|
|
&datum,
|
|
&isNull))
|
|
elog(WARN, "ExecutePlan: NO (junk) `ctid' was found!");
|
|
|
|
if (isNull)
|
|
elog(WARN, "ExecutePlan: (junk) `ctid' is NULL!");
|
|
|
|
tupleid = (ItemPointer) DatumGetPointer(datum);
|
|
tuple_ctid = *tupleid; /* make sure we don't free the
|
|
* ctid!! */
|
|
tupleid = &tuple_ctid;
|
|
}
|
|
|
|
/* ---------------
|
|
* Finally create a new "clean" tuple with all junk attributes
|
|
* removed
|
|
* ---------------
|
|
*/
|
|
newTuple = ExecRemoveJunk(junkfilter, slot);
|
|
|
|
slot = ExecStoreTuple(newTuple, /* tuple to store */
|
|
slot, /* destination slot */
|
|
InvalidBuffer, /* this tuple has no
|
|
* buffer */
|
|
true); /* tuple should be pfreed */
|
|
} /* if (junkfilter... */
|
|
|
|
/* ----------------
|
|
* now that we have a tuple, do the appropriate thing
|
|
* with it.. either return it to the user, add
|
|
* it to a relation someplace, delete it from a
|
|
* relation, or modify some of it's attributes.
|
|
* ----------------
|
|
*/
|
|
|
|
switch (operation)
|
|
{
|
|
case CMD_SELECT:
|
|
ExecRetrieve(slot, /* slot containing tuple */
|
|
printfunc, /* print function */
|
|
estate); /* */
|
|
result = slot;
|
|
break;
|
|
|
|
case CMD_INSERT:
|
|
ExecAppend(slot, tupleid, estate);
|
|
result = NULL;
|
|
break;
|
|
|
|
case CMD_DELETE:
|
|
ExecDelete(slot, tupleid, estate);
|
|
result = NULL;
|
|
break;
|
|
|
|
case CMD_UPDATE:
|
|
ExecReplace(slot, tupleid, estate, parseTree);
|
|
result = NULL;
|
|
break;
|
|
|
|
/*
|
|
* Total hack. I'm ignoring any accessor functions for
|
|
* Relation, RelationTupleForm, NameData. Assuming that
|
|
* NameData.data has offset 0.
|
|
*/
|
|
case CMD_NOTIFY:
|
|
{
|
|
RelationInfo *rInfo = estate->es_result_relation_info;
|
|
Relation rDesc = rInfo->ri_RelationDesc;
|
|
|
|
Async_Notify(rDesc->rd_rel->relname.data);
|
|
result = NULL;
|
|
current_tuple_count = 0;
|
|
numberTuples = 1;
|
|
elog(DEBUG, "ExecNotify %s", &rDesc->rd_rel->relname);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
elog(DEBUG, "ExecutePlan: unknown operation in queryDesc");
|
|
result = NULL;
|
|
break;
|
|
}
|
|
/* ----------------
|
|
* check our tuple count.. if we've returned the
|
|
* proper number then return, else loop again and
|
|
* process more tuples..
|
|
* ----------------
|
|
*/
|
|
current_tuple_count += 1;
|
|
if (numberTuples == current_tuple_count)
|
|
break;
|
|
}
|
|
|
|
/* ----------------
|
|
* here, result is either a slot containing a tuple in the case
|
|
* of a RETRIEVE or NULL otherwise.
|
|
* ----------------
|
|
*/
|
|
return result;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecRetrieve
|
|
*
|
|
* RETRIEVEs are easy.. we just pass the tuple to the appropriate
|
|
* print function. The only complexity is when we do a
|
|
* "retrieve into", in which case we insert the tuple into
|
|
* the appropriate relation (note: this is a newly created relation
|
|
* so we don't need to worry about indices or locks.)
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
static void
|
|
ExecRetrieve(TupleTableSlot * slot,
|
|
void (*printfunc) (),
|
|
EState * estate)
|
|
{
|
|
HeapTuple tuple;
|
|
TupleDesc attrtype;
|
|
|
|
/* ----------------
|
|
* get the heap tuple out of the tuple table slot
|
|
* ----------------
|
|
*/
|
|
tuple = slot->val;
|
|
attrtype = slot->ttc_tupleDescriptor;
|
|
|
|
/* ----------------
|
|
* insert the tuple into the "into relation"
|
|
* ----------------
|
|
*/
|
|
if (estate->es_into_relation_descriptor != NULL)
|
|
{
|
|
heap_insert(estate->es_into_relation_descriptor, tuple);
|
|
IncrAppended();
|
|
}
|
|
|
|
/* ----------------
|
|
* send the tuple to the front end (or the screen)
|
|
* ----------------
|
|
*/
|
|
(*printfunc) (tuple, attrtype);
|
|
IncrRetrieved();
|
|
(estate->es_processed)++;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecAppend
|
|
*
|
|
* APPENDs are trickier.. we have to insert the tuple into
|
|
* the base relation and insert appropriate tuples into the
|
|
* index relations.
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
|
|
static void
|
|
ExecAppend(TupleTableSlot * slot,
|
|
ItemPointer tupleid,
|
|
EState * estate)
|
|
{
|
|
HeapTuple tuple;
|
|
RelationInfo *resultRelationInfo;
|
|
Relation resultRelationDesc;
|
|
int numIndices;
|
|
Oid newId;
|
|
|
|
/* ----------------
|
|
* get the heap tuple out of the tuple table slot
|
|
* ----------------
|
|
*/
|
|
tuple = slot->val;
|
|
|
|
/* ----------------
|
|
* get information on the result relation
|
|
* ----------------
|
|
*/
|
|
resultRelationInfo = estate->es_result_relation_info;
|
|
resultRelationDesc = resultRelationInfo->ri_RelationDesc;
|
|
|
|
/* ----------------
|
|
* have to add code to preform unique checking here.
|
|
* cim -12/1/89
|
|
* ----------------
|
|
*/
|
|
|
|
/* BEFORE ROW INSERT Triggers */
|
|
if (resultRelationDesc->trigdesc &&
|
|
resultRelationDesc->trigdesc->n_before_row[TRIGGER_EVENT_INSERT] > 0)
|
|
{
|
|
HeapTuple newtuple;
|
|
|
|
newtuple = ExecBRInsertTriggers(resultRelationDesc, tuple);
|
|
|
|
if (newtuple == NULL) /* "do nothing" */
|
|
return;
|
|
|
|
if (newtuple != tuple) /* modified by Trigger(s) */
|
|
{
|
|
Assert(slot->ttc_shouldFree);
|
|
pfree(tuple);
|
|
slot->val = tuple = newtuple;
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* Check the constraints of a tuple
|
|
* ----------------
|
|
*/
|
|
|
|
if (resultRelationDesc->rd_att->constr)
|
|
{
|
|
HeapTuple newtuple;
|
|
|
|
newtuple = ExecConstraints("ExecAppend", resultRelationDesc, tuple);
|
|
|
|
if (newtuple != tuple) /* modified by DEFAULT */
|
|
{
|
|
Assert(slot->ttc_shouldFree);
|
|
pfree(tuple);
|
|
slot->val = tuple = newtuple;
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* insert the tuple
|
|
* ----------------
|
|
*/
|
|
newId = heap_insert(resultRelationDesc, /* relation desc */
|
|
tuple); /* heap tuple */
|
|
IncrAppended();
|
|
|
|
/* ----------------
|
|
* process indices
|
|
*
|
|
* Note: heap_insert adds a new tuple to a relation. As a side
|
|
* effect, the tupleid of the new tuple is placed in the new
|
|
* tuple's t_ctid field.
|
|
* ----------------
|
|
*/
|
|
numIndices = resultRelationInfo->ri_NumIndices;
|
|
if (numIndices > 0)
|
|
{
|
|
ExecInsertIndexTuples(slot, &(tuple->t_ctid), estate, false);
|
|
}
|
|
(estate->es_processed)++;
|
|
estate->es_lastoid = newId;
|
|
|
|
/* AFTER ROW INSERT Triggers */
|
|
if (resultRelationDesc->trigdesc &&
|
|
resultRelationDesc->trigdesc->n_after_row[TRIGGER_EVENT_INSERT] > 0)
|
|
ExecARInsertTriggers(resultRelationDesc, tuple);
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecDelete
|
|
*
|
|
* DELETE is like append, we delete the tuple and its
|
|
* index tuples.
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
static void
|
|
ExecDelete(TupleTableSlot * slot,
|
|
ItemPointer tupleid,
|
|
EState * estate)
|
|
{
|
|
RelationInfo *resultRelationInfo;
|
|
Relation resultRelationDesc;
|
|
|
|
/* ----------------
|
|
* get the result relation information
|
|
* ----------------
|
|
*/
|
|
resultRelationInfo = estate->es_result_relation_info;
|
|
resultRelationDesc = resultRelationInfo->ri_RelationDesc;
|
|
|
|
/* BEFORE ROW DELETE Triggers */
|
|
if (resultRelationDesc->trigdesc &&
|
|
resultRelationDesc->trigdesc->n_before_row[TRIGGER_EVENT_DELETE] > 0)
|
|
{
|
|
bool dodelete;
|
|
|
|
dodelete = ExecBRDeleteTriggers(resultRelationDesc, tupleid);
|
|
|
|
if (!dodelete) /* "do nothing" */
|
|
return;
|
|
}
|
|
|
|
/* ----------------
|
|
* delete the tuple
|
|
* ----------------
|
|
*/
|
|
if (heap_delete(resultRelationDesc, /* relation desc */
|
|
tupleid)) /* item pointer to tuple */
|
|
return;
|
|
|
|
IncrDeleted();
|
|
(estate->es_processed)++;
|
|
|
|
/* ----------------
|
|
* Note: Normally one would think that we have to
|
|
* delete index tuples associated with the
|
|
* heap tuple now..
|
|
*
|
|
* ... but in POSTGRES, we have no need to do this
|
|
* because the vacuum daemon automatically
|
|
* opens an index scan and deletes index tuples
|
|
* when it finds deleted heap tuples. -cim 9/27/89
|
|
* ----------------
|
|
*/
|
|
|
|
/* AFTER ROW DELETE Triggers */
|
|
if (resultRelationDesc->trigdesc &&
|
|
resultRelationDesc->trigdesc->n_after_row[TRIGGER_EVENT_DELETE] > 0)
|
|
ExecARDeleteTriggers(resultRelationDesc, tupleid);
|
|
|
|
}
|
|
|
|
/* ----------------------------------------------------------------
|
|
* ExecReplace
|
|
*
|
|
* note: we can't run replace queries with transactions
|
|
* off because replaces are actually appends and our
|
|
* scan will mistakenly loop forever, replacing the tuple
|
|
* it just appended.. This should be fixed but until it
|
|
* is, we don't want to get stuck in an infinite loop
|
|
* which corrupts your database..
|
|
* ----------------------------------------------------------------
|
|
*/
|
|
static void
|
|
ExecReplace(TupleTableSlot * slot,
|
|
ItemPointer tupleid,
|
|
EState * estate,
|
|
Query * parseTree)
|
|
{
|
|
HeapTuple tuple;
|
|
RelationInfo *resultRelationInfo;
|
|
Relation resultRelationDesc;
|
|
int numIndices;
|
|
|
|
/* ----------------
|
|
* abort the operation if not running transactions
|
|
* ----------------
|
|
*/
|
|
if (IsBootstrapProcessingMode())
|
|
{
|
|
elog(DEBUG, "ExecReplace: replace can't run without transactions");
|
|
return;
|
|
}
|
|
|
|
/* ----------------
|
|
* get the heap tuple out of the tuple table slot
|
|
* ----------------
|
|
*/
|
|
tuple = slot->val;
|
|
|
|
/* ----------------
|
|
* get the result relation information
|
|
* ----------------
|
|
*/
|
|
resultRelationInfo = estate->es_result_relation_info;
|
|
resultRelationDesc = resultRelationInfo->ri_RelationDesc;
|
|
|
|
/* ----------------
|
|
* have to add code to preform unique checking here.
|
|
* in the event of unique tuples, this becomes a deletion
|
|
* of the original tuple affected by the replace.
|
|
* cim -12/1/89
|
|
* ----------------
|
|
*/
|
|
|
|
/* BEFORE ROW UPDATE Triggers */
|
|
if (resultRelationDesc->trigdesc &&
|
|
resultRelationDesc->trigdesc->n_before_row[TRIGGER_EVENT_UPDATE] > 0)
|
|
{
|
|
HeapTuple newtuple;
|
|
|
|
newtuple = ExecBRUpdateTriggers(resultRelationDesc, tupleid, tuple);
|
|
|
|
if (newtuple == NULL) /* "do nothing" */
|
|
return;
|
|
|
|
if (newtuple != tuple) /* modified by Trigger(s) */
|
|
{
|
|
Assert(slot->ttc_shouldFree);
|
|
pfree(tuple);
|
|
slot->val = tuple = newtuple;
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* Check the constraints of a tuple
|
|
* ----------------
|
|
*/
|
|
|
|
if (resultRelationDesc->rd_att->constr)
|
|
{
|
|
HeapTuple newtuple;
|
|
|
|
newtuple = ExecConstraints("ExecReplace", resultRelationDesc, tuple);
|
|
|
|
if (newtuple != tuple) /* modified by DEFAULT */
|
|
{
|
|
Assert(slot->ttc_shouldFree);
|
|
pfree(tuple);
|
|
slot->val = tuple = newtuple;
|
|
}
|
|
}
|
|
|
|
/* ----------------
|
|
* replace the heap tuple
|
|
*
|
|
* Don't want to continue if our heap_replace didn't actually
|
|
* do a replace. This would be the case if heap_replace
|
|
* detected a non-functional update. -kw 12/30/93
|
|
* ----------------
|
|
*/
|
|
if (heap_replace(resultRelationDesc, /* relation desc */
|
|
tupleid, /* item ptr of tuple to replace */
|
|
tuple))
|
|
{ /* replacement heap tuple */
|
|
return;
|
|
}
|
|
|
|
IncrReplaced();
|
|
(estate->es_processed)++;
|
|
|
|
/* ----------------
|
|
* Note: instead of having to update the old index tuples
|
|
* associated with the heap tuple, all we do is form
|
|
* and insert new index tuples.. This is because
|
|
* replaces are actually deletes and inserts and
|
|
* index tuple deletion is done automagically by
|
|
* the vaccuum deamon.. All we do is insert new
|
|
* index tuples. -cim 9/27/89
|
|
* ----------------
|
|
*/
|
|
|
|
/* ----------------
|
|
* process indices
|
|
*
|
|
* heap_replace updates a tuple in the base relation by invalidating
|
|
* it and then appending a new tuple to the relation. As a side
|
|
* effect, the tupleid of the new tuple is placed in the new
|
|
* tuple's t_ctid field. So we now insert index tuples using
|
|
* the new tupleid stored there.
|
|
* ----------------
|
|
*/
|
|
|
|
numIndices = resultRelationInfo->ri_NumIndices;
|
|
if (numIndices > 0)
|
|
{
|
|
ExecInsertIndexTuples(slot, &(tuple->t_ctid), estate, true);
|
|
}
|
|
|
|
/* AFTER ROW UPDATE Triggers */
|
|
if (resultRelationDesc->trigdesc &&
|
|
resultRelationDesc->trigdesc->n_after_row[TRIGGER_EVENT_UPDATE] > 0)
|
|
ExecARUpdateTriggers(resultRelationDesc, tupleid, tuple);
|
|
}
|
|
|
|
static HeapTuple
|
|
ExecAttrDefault(Relation rel, HeapTuple tuple)
|
|
{
|
|
int ndef = rel->rd_att->constr->num_defval;
|
|
AttrDefault *attrdef = rel->rd_att->constr->defval;
|
|
ExprContext *econtext = makeNode(ExprContext);
|
|
HeapTuple newtuple;
|
|
Node *expr;
|
|
bool isnull;
|
|
bool isdone;
|
|
Datum val;
|
|
Datum *replValue = NULL;
|
|
char *replNull = NULL;
|
|
char *repl = NULL;
|
|
int i;
|
|
|
|
econtext->ecxt_scantuple = NULL; /* scan tuple slot */
|
|
econtext->ecxt_innertuple = NULL; /* inner tuple slot */
|
|
econtext->ecxt_outertuple = NULL; /* outer tuple slot */
|
|
econtext->ecxt_relation = NULL; /* relation */
|
|
econtext->ecxt_relid = 0; /* relid */
|
|
econtext->ecxt_param_list_info = NULL; /* param list info */
|
|
econtext->ecxt_range_table = NULL; /* range table */
|
|
for (i = 0; i < ndef; i++)
|
|
{
|
|
if (!heap_attisnull(tuple, attrdef[i].adnum))
|
|
continue;
|
|
expr = (Node *) stringToNode(attrdef[i].adbin);
|
|
|
|
val = ExecEvalExpr(expr, econtext, &isnull, &isdone);
|
|
|
|
pfree(expr);
|
|
|
|
if (isnull)
|
|
continue;
|
|
|
|
if (repl == NULL)
|
|
{
|
|
repl = (char *) palloc(rel->rd_att->natts * sizeof(char));
|
|
replNull = (char *) palloc(rel->rd_att->natts * sizeof(char));
|
|
replValue = (Datum *) palloc(rel->rd_att->natts * sizeof(Datum));
|
|
memset(repl, ' ', rel->rd_att->natts * sizeof(char));
|
|
}
|
|
|
|
repl[attrdef[i].adnum - 1] = 'r';
|
|
replNull[attrdef[i].adnum - 1] = ' ';
|
|
replValue[attrdef[i].adnum - 1] = val;
|
|
|
|
}
|
|
|
|
pfree(econtext);
|
|
|
|
if (repl == NULL)
|
|
return (tuple);
|
|
|
|
newtuple = heap_modifytuple(tuple, InvalidBuffer, rel, replValue, replNull, repl);
|
|
|
|
pfree(repl);
|
|
pfree(replNull);
|
|
pfree(replValue);
|
|
|
|
return (newtuple);
|
|
|
|
}
|
|
|
|
static char *
|
|
ExecRelCheck(Relation rel, HeapTuple tuple)
|
|
{
|
|
int ncheck = rel->rd_att->constr->num_check;
|
|
ConstrCheck *check = rel->rd_att->constr->check;
|
|
ExprContext *econtext = makeNode(ExprContext);
|
|
TupleTableSlot *slot = makeNode(TupleTableSlot);
|
|
RangeTblEntry *rte = makeNode(RangeTblEntry);
|
|
List *rtlist;
|
|
List *qual;
|
|
bool res;
|
|
int i;
|
|
|
|
slot->val = tuple;
|
|
slot->ttc_shouldFree = false;
|
|
slot->ttc_descIsNew = true;
|
|
slot->ttc_tupleDescriptor = rel->rd_att;
|
|
slot->ttc_buffer = InvalidBuffer;
|
|
slot->ttc_whichplan = -1;
|
|
rte->relname = nameout(&(rel->rd_rel->relname));
|
|
rte->timeRange = NULL;
|
|
rte->refname = rte->relname;
|
|
rte->relid = rel->rd_id;
|
|
rte->inh = false;
|
|
rte->archive = false;
|
|
rte->inFromCl = true;
|
|
rte->timeQual = NULL;
|
|
rtlist = lcons(rte, NIL);
|
|
econtext->ecxt_scantuple = slot; /* scan tuple slot */
|
|
econtext->ecxt_innertuple = NULL; /* inner tuple slot */
|
|
econtext->ecxt_outertuple = NULL; /* outer tuple slot */
|
|
econtext->ecxt_relation = rel; /* relation */
|
|
econtext->ecxt_relid = 0; /* relid */
|
|
econtext->ecxt_param_list_info = NULL; /* param list info */
|
|
econtext->ecxt_range_table = rtlist; /* range table */
|
|
|
|
for (i = 0; i < ncheck; i++)
|
|
{
|
|
qual = (List *) stringToNode(check[i].ccbin);
|
|
|
|
res = ExecQual(qual, econtext);
|
|
|
|
pfree(qual);
|
|
|
|
if (!res)
|
|
return (check[i].ccname);
|
|
}
|
|
|
|
pfree(slot);
|
|
pfree(rte->relname);
|
|
pfree(rte);
|
|
pfree(rtlist);
|
|
pfree(econtext);
|
|
|
|
return ((char *) NULL);
|
|
|
|
}
|
|
|
|
HeapTuple
|
|
ExecConstraints(char *caller, Relation rel, HeapTuple tuple)
|
|
{
|
|
HeapTuple newtuple = tuple;
|
|
|
|
Assert(rel->rd_att->constr);
|
|
|
|
if (rel->rd_att->constr->num_defval > 0)
|
|
newtuple = tuple = ExecAttrDefault(rel, tuple);
|
|
|
|
if (rel->rd_att->constr->has_not_null)
|
|
{
|
|
int attrChk;
|
|
|
|
for (attrChk = 1; attrChk <= rel->rd_att->natts; attrChk++)
|
|
{
|
|
if (rel->rd_att->attrs[attrChk - 1]->attnotnull && heap_attisnull(tuple, attrChk))
|
|
elog(WARN, "%s: Fail to add null value in not null attribute %s",
|
|
caller, rel->rd_att->attrs[attrChk - 1]->attname.data);
|
|
}
|
|
}
|
|
|
|
if (rel->rd_att->constr->num_check > 0)
|
|
{
|
|
char *failed;
|
|
|
|
if ((failed = ExecRelCheck(rel, tuple)) != NULL)
|
|
elog(WARN, "%s: rejected due to CHECK constraint %s", caller, failed);
|
|
}
|
|
|
|
return (newtuple);
|
|
}
|