Wan Kun created SPARK-36478:
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Summary: Removes outer join if all grouping and aggregate
expressions are from the streamed side
Key: SPARK-36478
URL: https://issues.apache.org/jira/browse/SPARK-36478
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.2.0
Reporter: Wan Kun
Removes outer join if all grouping and aggregate expressions are from the
streamed side.
For example:
{code:java}
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:
{code:java}
== Optimized Logical Plan ==
Aggregate [b#3L], [b#3L, max(c#4L) AS c#20L]
+- Project [b#3L, c#4L]
+- Join LeftOuter, (a#2L = a#10L)
:- Project [id#0L AS a#2L, id#0L AS b#3L, id#0L AS c#4L]
: +- Range (0, 200, step=1, splits=Some(1))
+- Project [id#8L AS a#10L]
+- Range (0, 300, step=1, splits=Some(1))
{code}
Expected optimized plan:
{code:java}
== Optimized Logical Plan ==
Aggregate [b#277L], [b#277L, max(c#278L) AS c#290L]
+- Project [id#274L AS b#277L, id#274L AS c#278L]
+- Range (0, 200, step=1, splits=Some(2))
{code}
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