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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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2
src/backend/nodes/outfuncs.c
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@ -271,6 +271,7 @@ _outPlanInfo(StringInfo str, const Plan *node)
WRITE_FLOAT_FIELD(total_cost, "%.2f");
WRITE_FLOAT_FIELD(plan_rows, "%.0f");
WRITE_INT_FIELD(plan_width);
WRITE_BOOL_FIELD(parallel_aware);
WRITE_INT_FIELD(plan_node_id);
WRITE_NODE_FIELD(targetlist);
WRITE_NODE_FIELD(qual);
@ -1585,6 +1586,7 @@ _outPathInfo(StringInfo str, const Path *node)
_outBitmapset(str, node->param_info->ppi_req_outer);
else
_outBitmapset(str, NULL);
WRITE_BOOL_FIELD(parallel_aware);
WRITE_FLOAT_FIELD(rows, "%.0f");
WRITE_FLOAT_FIELD(startup_cost, "%.2f");
WRITE_FLOAT_FIELD(total_cost, "%.2f");