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According to DatabaseMetaData#getFunctionColumns, the result column of COLUMN_TYPE may be one of

Where is the constant for functionColumnReturn?

Jin Kwon
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Seems like there's a typo (and it's been that way since its inception in 1.6).

It's not functionColumnReturn, it's just functionReturn (4).

Kayaman
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    Your answer, FYI, has been logged, my friend. https://github.com/jinahya/database-metadata-bind/blob/27729f1b55e8055ed9be8ae71743277b00649b70/src/main/java/com/github/jinahya/database/metadata/bind/FunctionColumn.java#L76 – Jin Kwon Oct 09 '17 at 13:44