Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/19738
Should this
https://github.com/apache/spark/pull/19738/files#diff-3b5463566251d5b09fd328738a9e9bc5R608
be this instead?
```
# If no schema supplied by user then get the names of columns only
if schema is None:
schema = [x.encode('utf-8') if not isinstance(x, str) else x for x in
data.columns]
```
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