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Restore sane locking behavior during parallel query.

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Commit 9a3cebeaa changed things so that parallel workers didn't obtain
any lock of their own on tables they access.  That was clearly a bad
idea, but I'd mistakenly supposed that it was the intended end result
of the series of patches for simplifying the executor's lock management.
Undo that change in relation_open(), and adjust ExecOpenScanRelation()
so that it gets the correct lock if inside a parallel worker.

In passing, clean up some more obsolete comments about when locks
are acquired.

Discussion: https://postgr.es/m/468c85d9-540e-66a2-1dde-fec2b741e688@lab.ntt.co.jp
This commit is contained in:
Tom Lane
2018-10-06 15:49:37 -04:00
parent f2343653f5
commit 29ef2b310d
11 changed files with 34 additions and 34 deletions
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5
src/backend/executor/nodeSeqscan.c
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@ -163,10 +163,7 @@ ExecInitSeqScan(SeqScan *node, EState *estate, int eflags)
ExecAssignExprContext(estate, &scanstate->ss.ps);
/*
* Initialize scan relation.
*
* Get the relation object id from the relid'th entry in the range table,
* open that relation and acquire appropriate lock on it.
* open the scan relation
*/
scanstate->ss.ss_currentRelation =
ExecOpenScanRelation(estate,