Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13847#discussion_r68487696
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/MapData.scala ---
@@ -19,6 +19,10 @@ package org.apache.spark.sql.catalyst.util
import org.apache.spark.sql.types.DataType
+/**
+ * `MapData` should not implement `equals` and `hashCode` because the type
cannot be used as join
--- End diff --
it's not your fault, but I think we need to add some comment for `MapData`
itself, and then follows this comment as a note. We can simply say: `An
internal data representation for map type in Spark SQL`.
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