Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19792#discussion_r152478594
--- Diff: python/pyspark/sql/types.py ---
@@ -1108,19 +1109,22 @@ def _has_nulltype(dt):
return isinstance(dt, NullType)
-def _merge_type(a, b):
+def _merge_type(a, b, name=None):
--- End diff --
When does this take the `name` parameter?
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