cloud-fan commented on a change in pull request #27542: [SPARK-30790]The
dataType of map() should be map<null,null>
URL: https://github.com/apache/spark/pull/27542#discussion_r378165632
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
##########
@@ -167,9 +175,9 @@ case class CreateMap(children: Seq[Expression]) extends
Expression {
override lazy val dataType: MapType = {
MapType(
keyType =
TypeCoercion.findCommonTypeDifferentOnlyInNullFlags(keys.map(_.dataType))
- .getOrElse(StringType),
+ .getOrElse(defaultElementType),
Review comment:
yea we need to handle it. Let's add `NullType` to `case _: AtomicType | _:
CalendarIntervalType if !keyType.isInstanceOf[BinaryType]`
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