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apache · Nov 16, 2018 · 574308e · 574308e
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diff --git a/docs/sql-migration-guide-upgrade.md b/docs/sql-migration-guide-upgrade.md
@@ -17,7 +17,7 @@ displayTitle: Spark SQL Upgrading Guide
 
   - The `ADD JAR` command previously returned a result set with the single value 0. It now returns an empty result set.
 
-  - In Spark version 2.4 and earlier, users can create map values with map type key via built-in function like `CreateMap`, `MapFromArrays`, etc. Since Spark 3.0, it's not allowed to create map values with map type key.
+  - In Spark version 2.4 and earlier, users can create map values with map type key via built-in function like `CreateMap`, `MapFromArrays`, etc. Since Spark 3.0, it's not allowed to create map values with map type key with these built-in functions. Users can still read map values with map type key from data source or Java/Scala collections, though they are not very useful.
 
 ## Upgrading From Spark SQL 2.3 to 2.4
 

diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala
@@ -54,7 +54,7 @@ object TypeUtils {
 
   def checkForMapKeyType(keyType: DataType): TypeCheckResult = {
     if (keyType.existsRecursively(_.isInstanceOf[MapType])) {
-      TypeCheckResult.TypeCheckFailure("The key of map cannot be/contains map.")
+      TypeCheckResult.TypeCheckFailure("The key of map cannot be/contain map.")
     } else {
       TypeCheckResult.TypeCheckSuccess
     }