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Make T_CoalesceExpr executable on a foreign server

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    p.gilev@postgrespro.ru
    Jan 27, 2026, 6:24 AM UTC
    Hello.
    Currently, T_CoalesceExpr is not executable on the foreign server.
    This functionality could be useful and the fix appears to be straightforward.
    The proposed modification extends foreignexprwalker to handle
    T_CoalesceExpr node, deparseCoalesceExpr is added to
    deparseExpr. A test case for COALESCE is also included.
    Regards,
    Pavel
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