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https://issues.apache.org/jira/browse/SPARK-13763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-13763.
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Resolution: Fixed
Fix Version/s: 2.0.0
Issue resolved by pull request 11599
[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
> Fix For: 2.0.0
>
>
> 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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