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https://issues.apache.org/jira/browse/SPARK-16672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-16672.
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Resolution: Fixed
Assignee: Dongjoon Hyun
Fix Version/s: 2.1.0
2.0.1
> SQLBuilder should not raise exceptions on EXISTS queries
> --------------------------------------------------------
>
> Key: SPARK-16672
> URL: https://issues.apache.org/jira/browse/SPARK-16672
> Project: Spark
> Issue Type: Bug
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Priority: Minor
> Fix For: 2.0.1, 2.1.0
>
>
> Currently, `SQLBuilder` raises `empty.reduceLeft` exceptions on
> **unoptimized** `EXISTS` queries. We had better prevent this.
> {code}
> scala> sql("CREATE TABLE t1(a int)")
> scala> val df = sql("select * from t1 b where exists (select * from t1 a)")
> scala> new org.apache.spark.sql.catalyst.SQLBuilder(df).toSQL
> java.lang.UnsupportedOperationException: empty.reduceLeft
> {code}
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