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Fix documentation error in commit 8703059c6b55c427100e00a09f66534b6ccbfaa1.

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Etsuro Fujita spotted a thinko in the README commentary.
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Tom Lane 2015-10-01 10:31:22 -04:00
parent e4c00750af
commit c4a1039fdf
1 changed files with 1 additions and 1 deletions
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src/backend/optimizer/README
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@ -254,7 +254,7 @@ lower leftjoin has min LHS of {B} and min RHS of {C,D}. Given such
information, join_is_legal would think it's okay to associate the upper information, join_is_legal would think it's okay to associate the upper
join into the lower join's RHS, transforming the query to join into the lower join's RHS, transforming the query to
B leftjoin (A leftjoin (C innerjoin D) on Pa) on (Pbcd) B leftjoin (A leftjoin (C innerjoin D) on Pa) on (Pbcd)
which yields totally wrong answers. We prevent that by forcing the min LHS which yields totally wrong answers. We prevent that by forcing the min RHS
for the upper join to include B. This is perhaps overly restrictive, but for the upper join to include B. This is perhaps overly restrictive, but
such cases don't arise often so it's not clear that it's worth developing a such cases don't arise often so it's not clear that it's worth developing a
more complicated system. more complicated system.