While reading I noticed that we allow multiple TO <version> in ALTER EXTENSION UPDATE, and defer throwing a syntax error until command processing. Is there a reason for deferring and not handling it in gram.y directly as in the attached patch since it is in fact a syntax error? It yields a different error message to the user, but makes for easier to read code (IMH-and-biased-O).
cheers ./daniel
extension_update_syntax.patch
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