[jira] [Commented] (SPARK-13763) Remove Project when its projectList is Empty

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

    [ https://issues.apache.org/jira/browse/SPARK-13763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186479#comment-15186479 ] 

Apache Spark commented on SPARK-13763:
--------------------------------------

User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/11599

> Remove Project when its projectList is Empty
> --------------------------------------------
>
>                 Key: SPARK-13763
>                 URL: https://issues.apache.org/jira/browse/SPARK-13763
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Xiao Li
>
> We are using 'SELECT 1' as a dummy table, when the table is used for SQL statements in which a table reference is required, but the contents of the table are not important. For example, 
> {code}
> SELECT pageid, adid FROM (SELECT 1) dummyTable LATERAL VIEW explode(adid_list) adTable AS adid;
> {code}
> In this case, we will see a useless Project whose projectList is empty after executing ColumnPruning rule. 



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