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(parent: 3c35de8) | patch
Marginal improvement in sublink planning: allow unknownEqFalse optimization
authorTom Lane <tgl@sss.pgh.pa.us>
Wed, 20 Aug 2008 19:58:24 +0000 (19:58 +0000)
committerTom Lane <tgl@sss.pgh.pa.us>
Wed, 20 Aug 2008 19:58:24 +0000 (19:58 +0000)
commitcc0dd438508d579cf9999304f4c8a8f4951410e1
tree65e3896eaf3cb0f4a5eb9121201b4cc4f9e7e37etree | snapshot
parent3c35de85e7b23f1152a069f9f8508d7fca270704commit | diff
Marginal improvement in sublink planning: allow unknownEqFalse optimization
to be used for SubLinks that are underneath a top-level OR clause.  Just as at
the very top level of WHERE, it's not necessary to be accurate about whether
the sublink returns FALSE or NULL, because either result has the same impact
on whether the WHERE will succeed.
src/backend/optimizer/plan/subselect.c diff | blob | history
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