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Clarify FDW documentation about ON CONFLICT.
Etsuro Fujita, reviewed by Peter Geoghegan
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@ -1196,9 +1196,10 @@ GetForeignServerByName(const char *name, bool missing_ok);
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<para>
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<command>INSERT</> with an <literal>ON CONFLICT</> clause does not
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support specifying the conflict target, as remote constraints are not
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locally known. This in turn implies that <literal>ON CONFLICT DO
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UPDATE</> is not supported, since the specification is mandatory there.
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support specifying the conflict target, as unique constraints or
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exclusion constraints on remote tables are not locally known. This
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in turn implies that <literal>ON CONFLICT DO UPDATE</> is not supported,
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since the specification is mandatory there.
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</para>
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</sect1>
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