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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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4
src/backend/executor/tqueue.c
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@ -66,7 +66,9 @@ tqueueStartupReceiver(DestReceiver *self, int operation, TupleDesc typeinfo)
static void
tqueueShutdownReceiver(DestReceiver *self)
{
/* do nothing */
TQueueDestReceiver *tqueue = (TQueueDestReceiver *) self;
shm_mq_detach(shm_mq_get_queue(tqueue->handle));
}
/*