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| -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 1140e02e474..916a51852e3 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. |