Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21361#discussion_r189215617
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -533,7 +536,7 @@ case class ArrayContains(left: Expression, right:
Expression)
arr.asInstanceOf[ArrayData].foreach(right.dataType, (i, v) =>
if (v == null) {
hasNull = true
- } else if (v == value) {
+ } else if (ordering.equiv(v, value)) {
--- End diff --
MapType is not supported in comparison, even `=`
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