| From: | "Hou, Zhijie" <houzj(dot)fnst(at)cn(dot)fujitsu(dot)com> |
|---|---|
| To: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Luc Vlaming <luc(at)swarm64(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Zhihong Yu <zyu(at)yugabyte(dot)com> |
| Subject: | RE: Parallel Inserts in CREATE TABLE AS |
| Date: | 2020-12-10 10:29:33 |
| Message-ID: | d48b632d3dae4b4d8d2162077427d8ef@G08CNEXMBPEKD05.g08.fujitsu.local |
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| Lists: | pgsql-hackers |
Hi
+ allow = ps && IsA(ps, GatherState) && !ps->ps_ProjInfo &&
+ plannedstmt->parallelModeNeeded &&
+ plannedstmt->planTree &&
+ IsA(plannedstmt->planTree, Gather) &&
+ plannedstmt->planTree->lefttree &&
+ plannedstmt->planTree->lefttree->parallel_aware &&
+ plannedstmt->planTree->lefttree->parallel_safe;
I noticed it check both IsA(ps, GatherState) and IsA(plannedstmt->planTree, Gather).
Does it mean it is possible that IsA(ps, GatherState) is true but IsA(plannedstmt->planTree, Gather) is false ?
I did some test but did not find a case like that.
Best regards,
houzj
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