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8526bcb2df
When a Gather or Gather Merge node is started and stopped multiple times, accumulate instrumentation data only once, at the end, instead of after each execution, to avoid recording inflated totals. Commit 778e78ae9fa51e58f41cbdc72b293291d02d8984, the previous attempt at a fix, instead reset the state after every execution, which worked for the general instrumentation data but had problems for the additional instrumentation specific to Sort and Hash nodes. Report by hubert depesz lubaczewski. Analysis and fix by Amit Kapila, following a design proposal from Thomas Munro, with a comment tweak by me. Discussion: http://postgr.es/m/20171127175631.GA405@depesz.com
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodeHash.h
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* prototypes for nodeHash.c
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*
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*
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* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/executor/nodeHash.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODEHASH_H
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#define NODEHASH_H
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#include "access/parallel.h"
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#include "nodes/execnodes.h"
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extern HashState *ExecInitHash(Hash *node, EState *estate, int eflags);
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extern Node *MultiExecHash(HashState *node);
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extern void ExecEndHash(HashState *node);
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extern void ExecReScanHash(HashState *node);
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extern HashJoinTable ExecHashTableCreate(Hash *node, List *hashOperators,
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bool keepNulls);
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extern void ExecHashTableDestroy(HashJoinTable hashtable);
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extern void ExecHashTableInsert(HashJoinTable hashtable,
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TupleTableSlot *slot,
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uint32 hashvalue);
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extern bool ExecHashGetHashValue(HashJoinTable hashtable,
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ExprContext *econtext,
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List *hashkeys,
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bool outer_tuple,
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bool keep_nulls,
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uint32 *hashvalue);
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extern void ExecHashGetBucketAndBatch(HashJoinTable hashtable,
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uint32 hashvalue,
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int *bucketno,
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int *batchno);
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extern bool ExecScanHashBucket(HashJoinState *hjstate, ExprContext *econtext);
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extern void ExecPrepHashTableForUnmatched(HashJoinState *hjstate);
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extern bool ExecScanHashTableForUnmatched(HashJoinState *hjstate,
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ExprContext *econtext);
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extern void ExecHashTableReset(HashJoinTable hashtable);
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extern void ExecHashTableResetMatchFlags(HashJoinTable hashtable);
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extern void ExecChooseHashTableSize(double ntuples, int tupwidth, bool useskew,
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int *numbuckets,
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int *numbatches,
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int *num_skew_mcvs);
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extern int ExecHashGetSkewBucket(HashJoinTable hashtable, uint32 hashvalue);
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extern void ExecHashEstimate(HashState *node, ParallelContext *pcxt);
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extern void ExecHashInitializeDSM(HashState *node, ParallelContext *pcxt);
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extern void ExecHashInitializeWorker(HashState *node, ParallelWorkerContext *pwcxt);
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extern void ExecHashRetrieveInstrumentation(HashState *node);
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extern void ExecShutdownHash(HashState *node);
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extern void ExecHashGetInstrumentation(HashInstrumentation *instrument,
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HashJoinTable hashtable);
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#endif /* NODEHASH_H */
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