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Parallel executor support.

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This code provides infrastructure for a parallel leader to start up
parallel workers to execute subtrees of the plan tree being executed
in the master.  User-supplied parameters from ParamListInfo are passed
down, but PARAM_EXEC parameters are not.  Various other constructs,
such as initplans, subplans, and CTEs, are also not currently shared.
Nevertheless, there's enough here to support a basic implementation of
parallel query, and we can lift some of the current restrictions as
needed.

Amit Kapila and Robert Haas
This commit is contained in:
Robert Haas
2015-09-28 21:55:57 -04:00
parent 0557dc276f
commit d1b7c1ffe7
17 changed files with 1007 additions and 2 deletions
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src/backend/nodes/readfuncs.c
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@ -1413,6 +1413,7 @@ ReadCommonPlan(Plan *local_node)
READ_FLOAT_FIELD(total_cost);
READ_FLOAT_FIELD(plan_rows);
READ_INT_FIELD(plan_width);
READ_INT_FIELD(plan_node_id);
READ_NODE_FIELD(targetlist);
READ_NODE_FIELD(qual);
READ_NODE_FIELD(lefttree);