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There is a syntactic ambiguity in the SQL standard. Since UNBOUNDED is a non-reserved word, it could be the name of a function parameter and be used as an expression. There is a grammar hack to resolve such cases as the keyword. Add some tests to record this behavior. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://www.postgresql.org/message-id/flat/b2a09a77-3c8f-7c68-c9b7-824054f87d98%40enterprisedb.com