[jira] [Created] (SPARK-29626) notEqual() should return true when the one is null, the other is not null

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

zhouhuazheng created SPARK-29626:
------------------------------------

             Summary: notEqual() should return true when the one is null, the other is not null
                 Key: SPARK-29626
                 URL: https://issues.apache.org/jira/browse/SPARK-29626
             Project: Spark
          Issue Type: Improvement
          Components: Documentation
    Affects Versions: 2.4.4
            Reporter: zhouhuazheng


the one is null，the other is not null, then use the function notEqual(), we hope it return true . 

eg: 

scala> df.show()
+------+-------+
| age| name|
+------+-------+
| null|Michael|
| 30| Andy|
| 19| Justin|
| 35| null|
| 19| Justin|
| null| null|
|Justin| Justin|
| 19| 19|
+------+-------+


scala> df.filter(col("age").notEqual(col("name"))).show
+---+------+
|age| name|
+---+------+
| 30| Andy|
| 19|Justin|
| 19|Justin|
+---+------+


scala> df.filter(col("age").equalTo(col("name"))).show
+------+------+
| age| name|
+------+------+
| null| null|
|Justin|Justin|
| 19| 19|
+------+------+



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