[jira] [Commented] (SPARK-16672) SQLBuilder should not raise exceptions on EXISTS queries

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-16672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388353#comment-15388353 ] 

Apache Spark commented on SPARK-16672:
--------------------------------------

User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/14307

> 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
>            Priority: Minor
>
> 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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