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_r377740536
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2016,6 +2016,15 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_MAP_DEFAULT_TO_STRING =
+ buildConf("spark.sql.legacy.mapDefaultToStringType.enabled")
+ .internal()
+ .doc("When set to true, it returns an empty map of string type when the
`map` " +
Review comment:
ditto
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