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| author | David Rowley <drowley@postgresql.org> | 2025-04-10 17:33:58 +1200 |
|---|---|---|
| committer | David Rowley <drowley@postgresql.org> | 2025-04-10 17:33:58 +1200 |
| commit | d7c04db27aeba1718d8059eae9a6e6a5eedc01b8 (patch) | |
| tree | ac8dbeb7e2b623ebc43e8ccff06a73ea7bf9eb86 /src | |
| parent | d438515c29c3cc539c79292c040335804183ca3e (diff) | |
| download | postgresql-d7c04db27aeba1718d8059eae9a6e6a5eedc01b8.tar.gz postgresql-d7c04db27aeba1718d8059eae9a6e6a5eedc01b8.zip | |
Update wording in optimizer/README for EquivalenceClasses
d69d45a5a changed how em_is_child members are stored in
EquivalenceClasses. Children are no longer stored in the ec_members
list. optimizer/README mentioned that most operations "should ignore
child members", but that felt a little untrue now since child members
are now stored in a separate place, they simply won't be found by the
normal means of looking (a foreach loop over ec_members), and if you don't
find them, there's technically no need to "ignore" them.
Here we tweak the wording slightly to reflect the new storage location
for child members.
Reported-by: Amit Langote <amitlangote09@gmail.com>
Author: Amit Langote <amitlangote09@gmail.com>
Author: David Rowley <dgrowleyml@gmail.com>
Discussion: https://postgr.es/m/CA+HiwqE8v=EuAP_3F_A2xn8zWx+nG_etW_Fe_DvKO-Fkx=+DdQ@mail.gmail.com
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 21c2db5a85c..9c724ccfabf 100644 --- a/src/backend/optimizer/README +++ b/src/backend/optimizer/README @@ -902,7 +902,7 @@ contain the equivalent child-relation variables or expressions. These members are *not* full-fledged members of the EquivalenceClass and do not affect the class's overall properties at all. They are kept only to simplify matching of child-relation expressions to EquivalenceClasses. -Most operations on EquivalenceClasses should ignore child members. +Most operations on EquivalenceClasses needn't look at child members. PathKeys |