Tom Lane 947d0c862c Use appendrel planning logic for top-level UNION ALL structures. ...

Formerly, we could convert a UNION ALL structure inside a subquery-in-FROM
into an appendrel, as a side effect of pulling up the subquery into its
parent; but top-level UNION ALL always caused use of plan_set_operations().
That didn't matter too much because you got an Append-based plan either
way.  However, now that the appendrel code can do things with MergeAppend,
it's worthwhile to hack up the top-level case so it also uses appendrels.

This is a bit of a stopgap; but going much further than this will require
a major rewrite of the planner's set-operations support, which I'm not
prepared to undertake now.  For the moment let's grab the low-hanging fruit.

2010-11-08 15:15:02 -05:00

..

clauses.h

Remove cvs keywords from all files.

2010-09-20 22:08:53 +02:00

cost.h

Support MergeAppend plans, to allow sorted output from append relations.

2010-10-14 16:57:57 -04:00

geqo_copy.h

Remove cvs keywords from all files.

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geqo_gene.h

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geqo_misc.h

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geqo_mutation.h

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geqo_pool.h

Remove cvs keywords from all files.

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geqo_random.h

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geqo_recombination.h

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geqo_selection.h

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geqo.h

Remove cvs keywords from all files.

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joininfo.h

Remove cvs keywords from all files.

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pathnode.h

Support MergeAppend plans, to allow sorted output from append relations.

2010-10-14 16:57:57 -04:00

paths.h

Reimplement planner's handling of MIN/MAX aggregate optimization.

2010-11-04 12:01:17 -04:00

placeholder.h

Fix PlaceHolderVar mechanism's interaction with outer joins.

2010-09-28 14:19:00 -04:00

plancat.h

Teach CLUSTER to use seqscan-and-sort when it's faster than indexscan.

2010-10-07 20:00:28 -04:00

planmain.h

Reimplement planner's handling of MIN/MAX aggregate optimization.

2010-11-04 12:01:17 -04:00

planner.h

Teach CLUSTER to use seqscan-and-sort when it's faster than indexscan.

2010-10-07 20:00:28 -04:00

predtest.h

Remove cvs keywords from all files.

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prep.h

Use appendrel planning logic for top-level UNION ALL structures.

2010-11-08 15:15:02 -05:00

restrictinfo.h

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subselect.h

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tlist.h

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var.h

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