XiDuo You created SPARK-39172:
---------------------------------
Summary: Remove outer join if all output come from streamed side
and buffered side keys exist unique
Key: SPARK-39172
URL: https://issues.apache.org/jira/browse/SPARK-39172
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.4.0
Reporter: XiDuo You
Improve the optimzation case using the distinct keys framework.
For example:
{code:java}
SELECT t1.* FROM t1 LEFT JOIN (SELECT distinct c1 as c1 FROM t)t2 ON t1.c1 =
t2.c1
==>
SELECT t1.* FROM t1 {code}
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