-
Btree indexes pg_upgraded from previous releases will not have this ordering. This slightly reduces the maximum length of indexed values.
+
This slightly reduces the maximum-allowed length of indexed values. Indexes pg_upgraded from previous releases will not have this ordering.
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-Allow more use of indexes for text columns comparisons with information_schema columns (Tom Lane)
+Allow more use of indexes for text comparisons with information_schema columns (Tom Lane)