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check_sql_fn_retval allows binary-compatibility cases, the expression extracted from an inline-able SQL function might have a type that is only binary-compatible with the declared function result type. To avoid possibly changing the semantics of the expression, we should insert a RelabelType node in such cases. This has only been shown to have bad consequences in recent 8.1 and up releases, but I suspect there may be failure cases in the older branches too, so patch it all the way back. Per bug #3116 from Greg Mullane. Along the way, fix an omission in eval_const_expressions_mutator: it failed to copy the relabelformat field when processing a RelabelType. No known observable failures from this, but it definitely isn't intended behavior. |
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