Yuming Wang created SPARK-37292:
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Summary: Removes outer join if it only has DISTINCT on streamed
side with alias
Key: SPARK-37292
URL: https://issues.apache.org/jira/browse/SPARK-37292
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.3.0
Reporter: Yuming Wang
{code:scala}
spark.range(200L).selectExpr("id AS a").createTempView("t1")
spark.range(300L).selectExpr("id AS b").createTempView("t2")
spark.sql("SELECT DISTINCT a AS newAlias FROM t1 LEFT JOIN t2 ON a =
b").explain(true)
{code}
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