Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19792#discussion_r153972800
--- Diff: python/pyspark/sql/types.py ---
@@ -1108,19 +1109,33 @@ def _has_nulltype(dt):
return isinstance(dt, NullType)
-def _merge_type(a, b):
+def _merge_type_path(path, addition):
--- End diff --
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