Count is different on DataFrames and Datasets from RDDs. On RDDs, it always
evaluates everything, but on DataFrame/Dataset, it turns into the equivalent of
"select count(*) from ..." in SQL, which can be done without scanning the data
for some data formats (e.g. Parquet). On the other hand thoug
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On Sat, Feb 18, 2017 at 11:07 AM Pritish Nawlakhe <
prit...@nirvana-international.com> wrote:
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Thank you!!
Regards
Pritish
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I think the right answer is "don't do that" but if you really had to you
could trigger a Dataset operation that does nothing per partition. I
presume that would be more reliable because the whole partition has to be
computed to make it available in practice. Or, go so far as to loop over
every elem
