Takuya Ueshin created SPARK-24007:
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Summary: EqualNullSafe for FloatType and DoubleType might generate
a wrong result by codegen.
Key: SPARK-24007
URL: https://issues.apache.org/jira/browse/SPARK-24007
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.3.0, 2.2.1, 2.1.2, 2.0.2
Reporter: Takuya Ueshin
{{EqualNullSafe}} for {{FloatType}} and {{DoubleType}} might generate a wrong
result by codegen.
{noformat}
scala> val df = Seq((Some(-1.0d), None), (None, Some(-1.0d))).toDF()
df: org.apache.spark.sql.DataFrame = [_1: double, _2: double]
scala> df.show()
+----+----+
| _1| _2|
+----+----+
|-1.0|null|
|null|-1.0|
+----+----+
scala> df.filter("_1 <=> _2").show()
+----+----+
| _1| _2|
+----+----+
|-1.0|null|
|null|-1.0|
+----+----+
{noformat}
The result should be empty but the result remains two rows.
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