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From mhornbech <mor...@datasolvr.com>
Subject Re: Spark 2.0 regression when querying very wide data frames
Date Sat, 20 Aug 2016 00:57:12 GMT
I did some extra digging. Running the query "select column1 from myTable" I
can reproduce the problem on a frame with a single row - it occurs exactly
when the frame has more than 200 columns, which smells a bit like a
hardcoded limit.

Interestingly the problem disappears when replacing the query with "select
column1 from myTable limit N" where N is arbitrary. However it appears again
when running "select * from myTable limit N" with sufficiently many columns
(haven't determined the exact threshold here).



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