mrocklin / dask / 1299

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travis-ci

Avoid shuffles when merging with Pandas objects

Previously dask.dataframe would convert all Pandas objects into
dask.dataframe objects.  In some cases this causes unnecessary shuffles.

In particular when you join a non-index column of a large dask.dataframe
against a small pandas table the right thing to do is to just move the
small pandas dataframe to all tasks, turning the computation into an
embarassingly parallel one.

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