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Posted to issues@spark.apache.org by "Yuming Wang (Jira)" <ji...@apache.org> on 2021/07/15 08:23:00 UTC

[jira] [Created] (SPARK-36155) Eliminate join base uniqueness

Yuming Wang created SPARK-36155:
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             Summary: Eliminate join base uniqueness
                 Key: SPARK-36155
                 URL: https://issues.apache.org/jira/browse/SPARK-36155
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: Yuming Wang


For example:
SELECT f1 FROM t1 LEFT JOIN (SELECT DISTINCT id FROM t2) t21 ON t1.id = t21.id  ==>
SELECT f1 FROM t1



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