Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18440
How about improving [the
description](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala#L191)
of `canonicalized ` in `QueryPlan`. We might forget to normalize the
expression when overwriting `canonicalized `. We already have a few PRs to fix
this issue. For example,
[SPARK-20718](https://issues.apache.org/jira/browse/SPARK-20718)
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