Yuming Wang created SPARK-34808:
-----------------------------------
Summary: Removes outer join if it only has distinct on streamed
side
Key: SPARK-34808
URL: https://issues.apache.org/jira/browse/SPARK-34808
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.2.0
Reporter: Yuming Wang
Assignee: Yuming Wang
For example:
{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 FROM t1 LEFT JOIN t2 ON a = b").explain(true)
{code}
Current optimized plan:
{noformat}
== Optimized Logical Plan ==
Aggregate [a#2L], [a#2L]
+- Project [a#2L]
+- Join LeftOuter, (a#2L = b#6L)
:- Project [id#0L AS a#2L]
: +- Range (0, 200, step=1, splits=Some(2))
+- Project [id#4L AS b#6L]
+- Range (0, 300, step=1, splits=Some(2))
{noformat}
Expected optimized plan:
{noformat}
== Optimized Logical Plan ==
Aggregate [a#2L], [a#2L]
+- Project [id#0L AS a#2L]
+- Range (0, 200, step=1, splits=Some(2))
{noformat}
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