Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19792#discussion_r153132348
--- Diff: python/pyspark/sql/types.py ---
@@ -1108,19 +1109,23 @@ def _has_nulltype(dt):
return isinstance(dt, NullType)
-def _merge_type(a, b):
+def _merge_type(a, b, path=''):
--- End diff --
Maybe, just printing the string in SQL could be an option too to be
consistent .. it's a bit messy for deeply nested schema though.:
```
TypeError: struct<f1:array<map<int,string>>> and
struct<f1:array<map<int,int>>> Can not blabla
```
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