Yang Jie created SPARK-56315:
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Summary: Pre-aggregate before Expand to reduce data amplification
for multiple COUNT(DISTINCT)
Key: SPARK-56315
URL: https://issues.apache.org/jira/browse/SPARK-56315
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 4.2.0
Reporter: Yang Jie
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