Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/2396#discussion_r17643762
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -246,6 +246,7 @@ object HiveMetastoreTypes extends RegexParsers {
case BooleanType => "boolean"
case DecimalType => "decimal"
case TimestampType => "timestamp"
+ case NullType => "string"
--- End diff --
Actually this is what Hive return by executing "explain select null from
src limit 1".
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