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https://issues.apache.org/jira/browse/SPARK-19472?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-19472:
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Assignee: (was: Apache Spark)
> [SQL]SQLParser fails to resolve nested CASE WHEN statement with parentheses
> ---------------------------------------------------------------------------
>
> Key: SPARK-19472
> URL: https://issues.apache.org/jira/browse/SPARK-19472
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: StanZhai
>
> SQLParser fails to resolve nested CASE WHEN statement like this:
> select case when
> (1) +
> case when 1>0 then 1 else 0 end = 2
> then 1 else 0 end
> from tb
> ==================== Exception ====================
> Exception in thread "main"
> org.apache.spark.sql.catalyst.parser.ParseException:
> mismatched input 'then' expecting {'.', '[', 'OR', 'AND', 'IN', NOT,
> 'BETWEEN', 'LIKE', RLIKE, 'IS', 'WHEN', EQ, '<=>', '<>', '!=', '<', LTE, '>',
> GTE, '+', '-', '*', '/', '%', 'DIV', '&', '|', '^'}(line 5, pos 0)
> == SQL ==
> select case when
> (1) +
> case when 1>0 then 1 else 0 end = 2
> then 1 else 0 end
> ^^^
> from tb
> But，remove parentheses will be fine：
> select case when
> 1 +
> case when 1>0 then 1 else 0 end = 2
> then 1 else 0 end
> from tb
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