121f49a00e
This area was a few bricks shy of a load, and badly under-commented too. We have to ensure that the generated targetlist entries for a set-operation node expose the correct collation for each entry, since higher-level processing expects the tlist to reflect the true ordering of the plan's output. This hackery wouldn't be necessary if SortGroupClause carried collation info ... but making it do so would inject more pain in the parser than would be saved here. Still, we might want to rethink that sometime.
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