1f6a7eba46
DO blocks use private simple_eval_estates to avoid intra-transaction memory leakage, cf commit c7b849a89. I had forgotten about that while writing commit 0fc94a5ba, but it means that expression execution trees created within a DO block disappear immediately on exiting the DO block, and hence can't safely be linked into plpgsql's session-wide cast hash table. To fix, give a DO block a private cast hash table to go with its private simple_eval_estate. This is less efficient than one could wish, since DO blocks can no longer share any cast lookup work with other plpgsql execution, but it shouldn't be too bad; in any case it's no worse than what happened in DO blocks before commit 0fc94a5ba. Per bug #13571 from Feike Steenbergen. Preliminary analysis by Oleksandr Shulgin.
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