Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/21427#discussion_r191006873
--- Diff: python/pyspark/worker.py ---
@@ -111,9 +114,16 @@ def wrapped(key_series, value_series):
"Number of columns of the returned pandas.DataFrame "
"doesn't match specified schema. "
"Expected: {} Actual: {}".format(len(return_type),
len(result.columns)))
- arrow_return_types = (to_arrow_type(field.dataType) for field in
return_type)
- return [(result[result.columns[i]], arrow_type)
- for i, arrow_type in enumerate(arrow_return_types)]
+ try:
+ # Assign result columns by schema name
+ return [(result[field.name], to_arrow_type(field.dataType))
for field in return_type]
+ except KeyError:
--- End diff --
I think it's possible for the column index to be many things, the user
could even assign it themselves right with `pdf.columns = ...`?
As far as I can tell, using a string as a key should always result in a
KeyError if not there.. If a MultiIndex is involved, it's a little more
complicated but I don't think that's allowed anyway
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