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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