Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21352#discussion_r203017442
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -737,21 +733,22 @@ case class MapConcat(children: Seq[Expression])
extends ComplexTypeMergingExpres
since = "2.4.0")
case class MapFromEntries(child: Expression) extends UnaryExpression {
- @transient
- private lazy val dataTypeDetails: Option[(MapType, Boolean, Boolean)] =
child.dataType match {
- case ArrayType(
- StructType(Array(
- StructField(_, keyType, keyNullable, _),
- StructField(_, valueType, valueNullable, _))),
- containsNull) => Some((MapType(keyType, valueType, valueNullable),
keyNullable, containsNull))
- case _ => None
+ @transient private lazy val dataTypeDetails: Option[(MapType, Boolean,
Boolean)] = {
+ child.dataType match {
+ case ArrayType(
+ StructType(Array(
+ StructField(_, kt, kn, _),
--- End diff --
the motivation is described
[here](https://github.com/apache/spark/pull/21352/files#r202983734). I will
revert this piece of code shortly.
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