[jira] [Created] (SPARK-42513) Push topK through join

["Yuming Wang (Jira)" <ji...@apache.org>]

Yuming Wang created SPARK-42513:
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             Summary: Push topK through join
                 Key: SPARK-42513
                 URL: https://issues.apache.org/jira/browse/SPARK-42513
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.4.0
            Reporter: Yuming Wang



{code:scala}
    spark.range(100000000).selectExpr("id % 10000 as a", "id as b").write.saveAsTable("t1")
    spark.range(100000000).selectExpr("id % 10000 as x", "id as y").write.saveAsTable("t2")

    sql("select * from t1 left join t2 on a = x order by b limit 5").collect()
    spark.sql("set spark.sql.optimizer.excludedRules=org.apache.spark.sql.catalyst.optimizer.LimitPushDown")
    sql("select * from t1 left join t2 on a = x order by b limit 5").collect()
{code}






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