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Because coerce_type recurses into the argument of a CollateExpr, coerce_to_target_type's longstanding code for detecting whether coerce_type had actually done anything (to wit, returned a different node than it passed in) was broken in 9.1. This resulted in unexpected failures in hide_coercion_node; which was not the latter's fault, since it's critical that we never call it on anything that wasn't inserted by coerce_type. (Else we might decide to "hide" a user-written function call.) Fix by removing and replacing the CollateExpr in coerce_to_target_type itself. This is all pretty ugly but I don't immediately see a way to make it nicer. Per report from Jean-Yves F. Barbier. |
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