Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22947#discussion_r230743943
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -66,6 +66,8 @@ case class AssertTrue(child: Expression) extends
UnaryExpression with ImplicitCa
override def nullable: Boolean = true
+ override lazy val deterministic: Boolean = false
--- End diff --
yes, that's true. The change may be big indeed. I am open to other
proposals, as creating a new `sideEffect` flag in the `Expression`.
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