[jira] [Created] (SPARK-39172) Remove outer join if all output come from streamed side and buffered side keys exist unique

["XiDuo You (Jira)" <ji...@apache.org>]

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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