wangyum commented on pull request #30222:
URL: https://github.com/apache/spark/pull/30222#issuecomment-722957043
Sorry. This change has logic issue, for example:
```scala
spark.sql("CREATE TABLE t using parquet AS SELECT if(id % 2 = 7, null, id)
AS a FROM range(7)")
spark.sql(
"""
|SELECT *
| FROM (SELECT CASE
| WHEN a > 1 THEN 1
| WHEN a > 3 THEN 3
| WHEN a > 5 THEN 5
| ELSE 6
|END AS x
|FROM t ) t1
|WHERE x = 3
|""".stripMargin).show
```
Before this pr, the result is empty, after this pr, the result is not empty.
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