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https://issues.apache.org/jira/browse/SPARK-38385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17503230#comment-17503230
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Apache Spark commented on SPARK-38385:
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User 'anchovYu' has created a pull request for this issue:
https://github.com/apache/spark/pull/35777
> Improve error messages of 'mismatched input' cases from ANTLR
> -------------------------------------------------------------
>
> Key: SPARK-38385
> URL: https://issues.apache.org/jira/browse/SPARK-38385
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Xinyi Yu
> Assignee: Xinyi Yu
> Priority: Major
> Fix For: 3.3.0
>
>
> Please view the parent task description for the general idea:
> https://issues.apache.org/jira/browse/SPARK-38384
> h1. Mismatched Input
> h2. Case 1
> Before
> {code:java}
> ParseException:
> mismatched input 'sel' expecting {'(', 'APPLY', 'CONVERT', 'COPY',
> 'OPTIMIZE', 'RESTORE', 'ADD', 'ALTER', 'ANALYZE', 'CACHE', 'CLEAR',
> 'COMMENT', 'COMMIT', 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DFS', 'DROP',
> 'EXPLAIN', 'EXPORT', 'FROM', 'GRANT', 'IMPORT', 'INSERT', 'LIST', 'LOAD',
> 'LOCK', 'MAP', 'MERGE', 'MSCK', 'REDUCE', 'REFRESH', 'REPLACE', 'RESET',
> 'REVOKE', 'ROLLBACK', 'SELECT', 'SET', 'SHOW', 'START', 'SYNC', 'TABLE',
> 'TRUNCATE', 'UNCACHE', 'UNLOCK', 'UPDATE', 'USE', 'VALUES', 'WITH'}(line 1,
> pos 0)
> == SQL ==
> sel 1
> ^^^ {code}
> After
> {code:java}
> ParseException:
> syntax error at or near 'sel'(line 1, pos 0)
> == SQL ==
> sel 1
> ^^^ {code}
> Changes:
> # Adjust the words, from ‘mismatched input {}’ to more readable one, ‘syntax
> error at or near {}.’. This also aligns with the PostgreSQL error messages.
> # Remove the expecting full list.
> h2. Case 2
> Before
> {code:java}
> ParseException:
> mismatched input '<EOF>' expecting {'(', 'CONVERT', 'COPY', 'OPTIMIZE',
> 'RESTORE', 'ADD', 'ALTER', 'ANALYZE', 'CACHE', 'CLEAR', 'COMMENT', 'COMMIT',
> 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DFS', 'DROP', 'EXPLAIN', 'EXPORT',
> 'FROM', 'GRANT', 'IMPORT', 'INSERT', 'LIST', 'LOAD', 'LOCK', 'MAP', 'MERGE',
> 'MSCK', 'REDUCE', 'REFRESH', 'REPLACE', 'RESET', 'REVOKE', 'ROLLBACK',
> 'SELECT', 'SET', 'SHOW', 'START', 'TABLE', 'TRUNCATE', 'UNCACHE', 'UNLOCK',
> 'UPDATE', 'USE', 'VALUES', 'WITH'}(line 1, pos 0)
> == SQL ==
> ^^^ {code}
> After
> {code:java}
> ParseException:
> syntax error, unexpected empty SQL statement(line 1, pos 0)
> == SQL ==
> ^^^{code}
> Changes:
> # For empty query, output a specific error message ‘syntax error, unexpected
> empty SQL statement’
> h2. Case 3
> Before
> {code:java}
> ParseException:
> mismatched input '<EOF>' expecting {'APPLY', 'CALLED', 'CHANGES', 'CLONE',
> 'COLLECT', 'CONTAINS', 'CONVERT', 'COPY', 'COPY_OPTIONS', 'CREDENTIAL',
> 'CREDENTIALS', 'DEEP', 'DEFINER', 'DELTA', 'DETERMINISTIC', 'ENCRYPTION',
> 'EXPECT', 'FAIL', 'FILES',… (omit long message) 'TRIM', 'TRUE', 'TRUNCATE',
> 'TRY_CAST', 'TYPE', 'UNARCHIVE', 'UNBOUNDED', 'UNCACHE', 'UNION', 'UNIQUE',
> 'UNKNOWN', 'UNLOCK', 'UNSET', 'UPDATE', 'USE', 'USER', 'USING', 'VALUES',
> 'VERSION', 'VIEW', 'VIEWS', 'WHEN', 'WHERE', 'WINDOW', 'WITH', 'WITHIN',
> 'YEAR', 'ZONE', IDENTIFIER, BACKQUOTED_IDENTIFIER}(line 1, pos 11)
> == SQL ==
> select 1 (
> -----------^^^ {code}
> After
> {code:java}
> ParseException:
> syntax error at or near end of input(line 1, pos 11)
> == SQL ==
> select 1 (
> -----------^^^{code}
> Changes:
> # For the faulty token <EOF>, substitute it to a readable string ‘end of
> input’.
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