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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