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Allow asynchronous execution in more cases.

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In commit 27e1f1456, create_append_plan() only allowed the subplan
created from a given subpath to be executed asynchronously when it was
an async-capable ForeignPath.  To extend coverage, this patch handles
cases when the given subpath includes some other Path types as well that
can be omitted in the plan processing, such as a ProjectionPath directly
atop an async-capable ForeignPath, allowing asynchronous execution in
partitioned-scan/partitioned-join queries with non-Var tlist expressions
and more UNION queries.

Andrey Lepikhov and Etsuro Fujita, reviewed by Alexander Pyhalov and
Zhihong Yu.

Discussion: https://postgr.es/m/659c37a8-3e71-0ff2-394c-f04428c76f08%40postgrespro.ru
This commit is contained in:
Etsuro Fujita
2022-04-06 15:45:00 +09:00
parent 376dc437de
commit c2bb02bc2e
9 changed files with 287 additions and 15 deletions
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1
src/backend/nodes/outfuncs.c
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@@ -638,6 +638,7 @@ _outSubqueryScan(StringInfo str, const SubqueryScan *node)
_outScanInfo(str, (const Scan *) node);
WRITE_NODE_FIELD(subplan);
WRITE_ENUM_FIELD(scanstatus, SubqueryScanStatus);
}
static void