[jira] [Created] (SPARK-42897) Avoid evaluate more than once for the variables from the left side in the FullOuter SMJ condition

["Wan Kun (Jira)" <ji...@apache.org>]

Wan Kun created SPARK-42897:
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             Summary: Avoid evaluate more than once for the variables from the left side in the FullOuter SMJ condition
                 Key: SPARK-42897
                 URL: https://issues.apache.org/jira/browse/SPARK-42897
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.4.0
            Reporter: Wan Kun


Codegen issue for FullOuter SMJ,  for example
{code}
    val df1 = spark.range(5).select($"id".as("k1"))
    val df2 = spark.range(10).select($"id".as("k2"))
    df1.join(df2.hint("SHUFFLE_MERGE"),
        $"k1" === $"k2" % 3 && $"k1" + 3 =!= $"k2" && $"k1" + 5 =!= $"k2", "full_outer")
{code}
the join condition *$"k1" + 3 =!= $"k2" && $"k1" + 5 =!= $"k2"* both will evaluate the variable *k1* and caused the codegen failed.



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