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

["Xiao Li (JIRA)" <ji...@apache.org>]

Xiao Li created SPARK-13763:
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             Summary: 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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