Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20670#discussion_r170840898
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala
---
@@ -27,16 +27,15 @@ trait QueryPlanConstraints { self: LogicalPlan =>
* example, if this set contains the expression `a = 2` then that
expression is guaranteed to
* evaluate to `true` for all rows produced.
--- End diff --
The comment belongs to `constraints` not `allConstraints`
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