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From Xiening Dai <xndai....@live.com>
Subject Question about incomingMask in ColumnReader::next
Date Tue, 10 Apr 2018 18:52:08 GMT
Hi all,

In ColumnReader.cc<http://ColumnReader.cc> line 108 - 113, there’s an incomingMask
parameter that’s used to mask some of the rows in the batch when it’s specified. I am
not sure why we would allow caller to specify a mask. If some of the rows are not desired,
the caller can always filter them after getting the row batch. Passing down a mask doesn’t
give any more benefits. Besides this parameter is always set to nullptr (see Reader.cc<http://Reader.cc>
line 832) as far as I can tell. So it looks to me that we should just remove it.

Any thoughts?
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