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(parent: 5fd386b) | patch

Change postgres_fdw to show casts as casts, not underlying function calls.

Change postgres_fdw to show casts as casts, not underlying function calls.

On reflection this method seems to be exposing an unreasonable amount of
implementation detail. It wouldn't matter when talking to a remote server
of the identical Postgres version, but it seems likely to make things worse
not better if the remote is a different version with different casting
infrastructure. Instead adopt ruleutils.c's policy of regurgitating the
cast as it was originally specified; including not showing it at all, if
it was implicit to start with. (We must do that because for some datatypes
explicit and implicit casts have different semantics.)

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