wangyum commented on issue #25114: [SPARK-28349][SQL] Add FALSE and SETMINUS to ansiNonReserved URL: https://github.com/apache/spark/pull/25114#issuecomment-513070211 or add a [regular_id](https://github.com/antlr/grammars-v4/blob/b7f5b6d8c4da4d45d3dcb8146df310b89cd58114/plsql/PlSqlParser.g4#L4569-L4644)? Some UDFs are also not available in ansi mode: ```sql spark-sql> select left('12345', 2); 12 spark-sql> set spark.sql.parser.ansi.enabled=true; spark.sql.parser.ansi.enabled true spark-sql> select left('12345', 2); Error in query: no viable alternative at input 'left'(line 1, pos 7) == SQL == select left('12345', 2) -------^^^ ```
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