[jira] [Created] (SPARK-21136) Misleading error message for typo in SQL

["Daniel Darabos (JIRA)" <ji...@apache.org>]

Daniel Darabos created SPARK-21136:
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             Summary: Misleading error message for typo in SQL
                 Key: SPARK-21136
                 URL: https://issues.apache.org/jira/browse/SPARK-21136
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: Daniel Darabos
            Priority: Minor


{code}
scala> spark.sql("select * from a left joinn b on a.id = b.id").show
org.apache.spark.sql.catalyst.parser.ParseException:
mismatched input 'from' expecting {<EOF>, 'WHERE', 'GROUP', 'ORDER', 'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 9)

== SQL ==
select * from a left joinn b on a.id = b.id
---------^^^
{code}

The issue is that {{^^^}} points at {{from}}, not at {{joinn}}. The text of the error makes no sense either. If {{*}}, {{a}}, and {{b}} are complex in themselves, a misleading error like this can hinder debugging substantially.

I tried to see if maybe I could fix this. Am I correct to deduce that the error message originates in ANTLR4, which parses the query based on the syntax defined in {{SqlBase.g4}}? If so, I guess I would have to figure out how that syntax definition works, and why it misattributes the error.



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