Github user gczsjdy commented on a diff in the pull request:
https://github.com/apache/spark/pull/20010#discussion_r157697044
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -99,6 +99,17 @@ object TypeCoercion {
case (_: TimestampType, _: DateType) | (_: DateType, _: TimestampType)
=>
Some(TimestampType)
+ case (t1 @ ArrayType(pointType1, nullable1), t2 @
ArrayType(pointType2, nullable2))
+ if t1.sameType(t2) =>
+ val dataType = findTightestCommonType(pointType1, pointType2).get
+ Some(ArrayType(dataType, nullable1 || nullable2))
+
+ case (t1 @ MapType(keyType1, valueType1, nullable1),
+ t2 @ MapType(keyType2, valueType2, nullable2)) if t1.sameType(t2)
=>
+ val keyType = findTightestCommonType(keyType1, keyType2).get
+ val valueType = findTightestCommonType(valueType1, valueType2).get
--- End diff --
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