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Commitd7c04db

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Update wording in optimizer/README for EquivalenceClasses
d69d45a changed how em_is_child members are stored inEquivalenceClasses. Children are no longer stored in the ec_memberslist. optimizer/README mentioned that most operations "should ignorechild members", but that felt a little untrue now since child membersare now stored in a separate place, they simply won't be found by thenormal means of looking (a foreach loop over ec_members), and if you don'tfind them, there's technically no need to "ignore" them.Here we tweak the wording slightly to reflect the new storage locationfor 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
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‎src/backend/optimizer/README

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@@ -902,7 +902,7 @@ contain the equivalent child-relation variables or expressions. These
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members are *not* full-fledged members of the EquivalenceClass and do not
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affect the class's overall properties at all. They are kept only to
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simplify matching of child-relation expressions to EquivalenceClasses.
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Most operations on EquivalenceClassesshould ignore child members.
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Most operations on EquivalenceClassesneedn't look at child members.
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