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Teach find_nonnullable_rels to handle OR cases: if every arm of an OR

author Tom Lane <tgl@sss.pgh.pa.us>

2007年2月16日 23:32:08 +0000 (23:32 +0000)

committer Tom Lane <tgl@sss.pgh.pa.us>

2007年2月16日 23:32:08 +0000 (23:32 +0000)

commit 72a070a3653ffc6519b9af5f3959f872cb4dea7d

tree dd521ed3458d4621097d5f61703ed2abd441ac74 tree

parent 46bd3bff624db8f3e9bc2e1dbb8ef7ad8c97ed2e commit | diff

Teach find_nonnullable_rels to handle OR cases: if every arm of an OR
forces a particular relation nonnullable, then we can say that the OR does.
This is worth a little extra trouble since it may allow reduction of
outer joins to plain joins.

src/backend/optimizer/util/clauses.c diff | blob | blame | history

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