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Commit0c99d41

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Allow hash joins to be interrupted while searching hash table for match.
Per experimentation with a recent example, in which unreasonable amountsof time could elapse before the backend would respond to a query-cancel.This might be something to back-patch, but the patch doesn't apply cleanlybecause this code was rewritten for 9.1. Given the lack of fieldcomplaints I won't bother for now.Cédric Villemain
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‎src/backend/executor/nodeHashjoin.c

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@@ -19,6 +19,7 @@
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#include"executor/hashjoin.h"
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#include"executor/nodeHash.h"
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#include"executor/nodeHashjoin.h"
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#include"miscadmin.h"
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#include"utils/memutils.h"
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@@ -262,6 +263,13 @@ ExecHashJoin(HashJoinState *node)
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caseHJ_SCAN_BUCKET:
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/*
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* We check for interrupts here because this corresponds to
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* where we'd fetch a row from a child plan node in other
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* join types.
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*/
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CHECK_FOR_INTERRUPTS();
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/*
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* Scan the selected hash bucket for matches to current outer
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*/

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