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Make sequential scans parallel-aware.

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In addition, this path fills in a number of missing bits and pieces in
the parallel infrastructure.  Paths and plans now have a parallel_aware
flag indicating whether whatever parallel-aware logic they have should
be engaged.  It is believed that we will need this flag for a number of
path/plan types, not just sequential scans, which is why the flag is
generic rather than part of the SeqScan structures specifically.
Also, execParallel.c now gives parallel nodes a chance to initialize
their PlanState nodes from the DSM during parallel worker startup.

Amit Kapila, with a fair amount of adjustment by me.  Review of previous
patch versions by Haribabu Kommi and others.
This commit is contained in:
Robert Haas
2015-11-11 08:57:52 -05:00
parent f764ecd81b
commit f0661c4e8c
18 changed files with 254 additions and 73 deletions
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4
src/backend/commands/explain.c
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@ -984,6 +984,8 @@ ExplainNode(PlanState *planstate, List *ancestors,
appendStringInfoString(es->str, "-> ");
es->indent += 2;
}
if (plan->parallel_aware)
appendStringInfoString(es->str, "Parallel ");
appendStringInfoString(es->str, pname);
es->indent++;
}
@ -1000,6 +1002,8 @@ ExplainNode(PlanState *planstate, List *ancestors,
ExplainPropertyText("Subplan Name", plan_name, es);
if (custom_name)
ExplainPropertyText("Custom Plan Provider", custom_name, es);
if (plan->parallel_aware)
ExplainPropertyText("Parallel Aware", "true", es);
}
switch (nodeTag(plan))