Liang-Chi Hsieh created SPARK-6466:
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Summary: Remove unnecessary attributes when resolving GroupingSets
Key: SPARK-6466
URL: https://issues.apache.org/jira/browse/SPARK-6466
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Liang-Chi Hsieh
Priority: Minor
When resolving GroupingSets, we currently list all outputs of GroupingSets's
child plan. However, the columns that are not in groupBy expressions and not
used by aggregation expressions are unnecessary and can be removed.
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