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The behavior I proposed, of matching case only when only keywords are available to complete, turns out to be too cute. It adds about as many problems as it removes. Simplify down to ilmari's original proposal of just always matching case when completing a keyword. Also, I noticed while testing this that we've pessimized the behavior for qualified GUC names: the code is insisting that they be double-quoted, which was not the case before. Fix that by treating GUC names as verbatim matches instead of possibly-schema-qualified names. (While it's tempting to try to split qualified GUC names so that we *could* treat them with the schema-qualified-name code path, that really isn't going to work in light of guc.c's willingness to allow more than two name components.) Dagfinn Ilmari Mannsåker and Tom Lane Discussion: https://postgr.es/m/445692.1644018081@sss.pgh.pa.us
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