Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22375#discussion_r224414284
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvalHelper.scala
---
@@ -69,11 +69,22 @@ trait ExpressionEvalHelper extends
GeneratorDrivenPropertyChecks with PlanTestBa
/**
* Check the equality between result of expression and expected value,
it will handle
- * Array[Byte], Spread[Double], MapData and Row.
+ * Array[Byte], Spread[Double], MapData and Row. Also check whether
exprNullable is true
--- End diff --
the comment doesn't match the method now
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