Davies Liu created SPARK-12213:
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Summary: Query with only one distinct should not having on expand
Key: SPARK-12213
URL: https://issues.apache.org/jira/browse/SPARK-12213
Project: Spark
Issue Type: Improvement
Reporter: Davies Liu
Expand will double the number of records, slow down projection and aggregation,
it's better to generate a plan without Expand for a query with only one
distinct (for example, ss_max in TPCDS)
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