Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/16719
The original logic was designed to be safe for changing the caller
bottom-up code,
[here](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala#L154-L157).
```scala
lazy val canonicalized: Expression = {
val canonicalizedChildren = children.map(_.canonicalized)
Canonicalize.execute(withNewChildren(canonicalizedChildren))
}
```
But, I agree that it's safe to simplify that with the new @lw-lin 's test
cases.
For the `assert` statements, I think @cloud-fan and @gatorsmile can give
more insightful advice.
For me, LGTM except that.
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