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Specifically, permit attaching them to the error in RAISE and retrieving them from a caught error in GET STACKED DIAGNOSTICS. RAISE enforces nothing about the content of the fields; for its purposes, they are just additional string fields. Consequently, clarify in the protocol and libpq documentation that the usual relationships between error fields, like a schema name appearing wherever a table name appears, are not universal. This freedom has other applications; consider a FDW propagating an error from an RDBMS having no schema support. Back-patch to 9.3, where core support for the error fields was introduced. This prevents the confusion of having a release where libpq exposes the fields and PL/pgSQL does not. Pavel Stehule, lexical revisions by Noah Misch. |
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