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Commit275b341

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Prevent parallel index build in a standalone backend.
This can't work if there's no postmaster, and indeed the code got anassertion failure trying. There should be a check on IsUnderPostmastergating the use of parallelism, as the planner has for ordinaryparallel queries.Commit40d964e got this right, so follow its model of checkingIsUnderPostmaster at the same place where we check formax_parallel_maintenance_workers == 0. In general, new codeimplementing parallel utility operations should do the same.Report and patch by Yulin Pei, cosmetically adjusted by me.Back-patch to v11 where this code came in.Discussion:https://postgr.es/m/HK0PR01MB22747D839F77142D7E76A45DF4F50@HK0PR01MB2274.apcprd01.prod.exchangelabs.com
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‎src/backend/optimizer/plan/planner.c

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -6375,8 +6375,11 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
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doublereltuples;
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doubleallvisfrac;
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/* Return immediately when parallelism disabled */
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if (max_parallel_maintenance_workers==0)
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/*
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* We don't allow performing parallel operation in standalone backend or
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* when parallelism is disabled.
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*/
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if (!IsUnderPostmaster||max_parallel_maintenance_workers==0)
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return0;
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/* Set up largely-dummy planner state */

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