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Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/optimizer/README | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/optimizer/README b/src/backend/optimizer/README index b896f91a3dd..b930354a292 100644 --- a/src/backend/optimizer/README +++ b/src/backend/optimizer/README @@ -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 join into the lower join's RHS, transforming the query to 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 such cases don't arise often so it's not clear that it's worth developing a more complicated system. |