Add nrows for partial parsing of csv/parquet

[dberenbaum]

No description provided.

[rlamy]

LGTM

It would be nice to have a generic mechanism for stopping generators early though. Maybe applying limit(10) should tell a preceding generator to stop after 10 rows.

[dberenbaum]

Closing in favor of #126

[dberenbaum]

LGTM

It would be nice to have a generic mechanism for stopping generators early though. Maybe applying limit(10) should tell a preceding generator to stop after 10 rows.

Agreed. I don't really like this hack. I'm not sure how easy it is to apply limit() to the right part of the chain though.

[dberenbaum]

Reopening since it looks like #126 will not be that simple.

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