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https://issues.apache.org/jira/browse/SPARK-37292?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yuming Wang updated SPARK-37292:
--------------------------------
Description:
{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}
Expected optimized plan:
{noformat}
== Optimized Logical Plan ==
Aggregate [newAlias#8L], [newAlias#8L]
+- Project [id#0L AS newAlias#8L]
+- Range (0, 200, step=1, splits=Some(2))
{noformat}
was:
{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}
> 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
> Priority: Major
>
> {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}
> Expected optimized plan:
> {noformat}
> == Optimized Logical Plan ==
> Aggregate [newAlias#8L], [newAlias#8L]
> +- Project [id#0L AS newAlias#8L]
> +- Range (0, 200, step=1, splits=Some(2))
> {noformat}
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