jeff303 commented on issue #26144: [SPARK-27903][SQL] Improve the error messages of SQL parser URL: https://github.com/apache/spark/pull/26144#issuecomment-545189592 > Can you show before and after error messages? Consider two simple queries. 1. `select (r + 1))` 2. `select ((r + 1)` Before, the error messages would be the following, respectively. ``` org.apache.spark.sql.catalyst.parser.ParseException: extraneous input ')' expecting <EOF>(line 1, pos 14) == SQL == select (r + 1)) --------------^^^ org.apache.spark.sql.catalyst.parser.ParseException: no viable alternative at input '((r + 1) '(line 1, pos 16) == SQL == select ((r + 1) ----------------^^^ ``` After: ``` org.apache.spark.sql.catalyst.parser.ParseException: Unbalanced parentheses (extra right)(line 1, pos 14) == SQL == select (r + 1)) --------------^^^ org.apache.spark.sql.catalyst.parser.ParseException: Unbalanced parentheses (extra left)(line 1, pos 7) == SQL == select ((r + 1) -------^^^ ```
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