Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6400#issuecomment-105373182
I went ahead and removed the use of `BufferedIterator`; based on looking
through the Git history, it looks like this was used in a very old version of
this code where we didn't have a schema and thus did not know how many columns
to expect, so we had to peek at the first row in order to construct converters.
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