Andreas Seltenreich <seltenreich(at)gmx(dot)de> writes:
> testing master as of 7c981590c2, sqlsmith just triggered the following
> assertion:
> TRAP: FailedAssertion("!(!((((const Node*)(node))->type) == T_SubLink))", File: "prepunion.c", Line: 2231)
Hmm. adjust_appendrel_attrs() thinks it's only used after conversion
of sublinks to subplans, but this is a counterexample. I wonder if
that assumption was ever correct? Or maybe we need to rethink what
it does when recursing into RTE subqueries.
regards, tom lane