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Move bitfield into common. #4737

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Aug 6, 2019
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@trivialfis trivialfis commented Aug 5, 2019

To be used by cudf support.

The validity mask from Apache arrow memory layout is passed in as unsigned char, but the specification also said that it must be of 8 byte aligned and the length should be padded to be a multiple of 8 byte. So uint64_t used in BitField fits.

@trivialfis trivialfis requested a review from RAMitchell August 5, 2019 16:49
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trivialfis commented Aug 5, 2019

@wbo4958 Feel free to provide suggestion as we move things along. ;-)

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@RAMitchell Merging as this is only moving code section, should be safe. Feel free to reach me for any doubt.

@trivialfis trivialfis merged commit 9c469b3 into dmlc:master Aug 6, 2019
@trivialfis trivialfis deleted the move-bitfield branch August 15, 2019 17:34
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