wangyum commented on pull request #30222:
URL: https://github.com/apache/spark/pull/30222#issuecomment-722858604
We can reproduce it by:
```scala
spark.sql("CREATE TABLE t(a int, b int, c int) using parquet")
spark.sql(
"""
|SELECT *
| FROM (SELECT CASE
| WHEN rd > 1 THEN 1
| WHEN b > 1000 THEN 2
| WHEN c < 100 THEN 3
| ELSE 4
|END AS x
|FROM (SELECT *, rand(100) as rd FROM t) t1) t2
|WHERE x = 2
|""".stripMargin).explain
```
1. `Alias.toAttribute` construct `AttributeReference` with default
deterministic, that is true:
https://github.com/apache/spark/blob/ca2cfd4185586993f981cfd2f1aff30ee6b2294e/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala#L181
2. Therefore, deterministic is true, and`SimplifyConditionals` can simplify
it:
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