iRakson 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_r378099765
##########
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:
In `ArrayBaseMapBuilder`, we have handled `Nulltype` for key. This causes
following problem:
```
scala> sql("select map(null,2)")
res1: org.apache.spark.sql.DataFrame = [map(NULL, 2): map<null,int>]
scala> sql("select map(null,2)").collect
scala.MatchError: NullType (of class org.apache.spark.sql.types.NullType$)
at
org.apache.spark.sql.catalyst.util.TypeUtils$.getInterpretedOrdering(TypeUtils.scala:67)
at
org.apache.spark.sql.catalyst.util.ArrayBasedMapBuilder.keyToIndex$lzycompute(ArrayBasedMapBuilder.scala:37)
```
After removing the assertion we need to handle this problem.
@cloud-fan
[#23124(comment)](https://github.com/apache/spark/pull/23124/commits/9df627465d9f9bcdde129baf1304035f082e5ab6?file-filters%5B%5D=.scala#r235929748)
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