Github user xguo27 commented on the pull request:
https://github.com/apache/spark/pull/10515#issuecomment-167915743
@marmbrus Thanks Michael for your feedback!
Looks like the 'value' is to give the single string column a arbitrary
name. Current implementation strips schema information when creating
TextRelation (after verifying the schema is single field with string type). It
is fine during read, but fails during write.
Would you mind taking another look at my updated change?
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