Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22110#discussion_r210561778
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/TypeUtils.scala
---
@@ -73,4 +73,14 @@ object TypeUtils {
}
x.length - y.length
}
+
+ /**
+ * Returns true if elements of the data type could be used as items of a
hash set or as keys
+ * of a hash map.
+ */
+ def typeCanBeHashed(dataType: DataType): Boolean = dataType match {
--- End diff --
we should, and I believe Spark has enforced it with style checker: when you
override `equals`, you must override `hashCode` too.
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