> This ERROR is thrown by a routine in the TrimExpr.java But you wrote that file, right? > So here comes my question: how to associate the front-end expression coded in > the sql-parser.cup with back-end implementation? I know there exists some > other similar function named extract(IDENT from Timestamp) which is > implemented in the udf-builtins.h and I have done the same thing. But that > does not work - so I must miss something important.
In what way does it not work? The way above? It looks like you didn't change getFunctionNotFoundError correctly. I don't think you want to do something different than ExtractFromExpr, but it looks like you didn't get the changes needed correctly yet.
