Dimitri Fontaine <dimitri@2ndQuadrant.fr> writes:
> Tom Lane <tgl@sss.pgh.pa.us> writes:
>> So to fix these problems we'd need to replace sort operator OIDs in
>> SortGroupClause and plan nodes with those three items. Obviously, this
>> would be slightly bulkier, but the extra cost added to copying parse and
>> plan trees should be tiny compared to the avoided syscache lookups.
> My understanding is that opfamily+datatype gives an opclass. What about
> storing the opclass OID there?
Then you'd just need to look up the opfamily again. Opclasses are too
small a division to be useful.
regards, tom lane