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Posted to github@arrow.apache.org by "WillAyd (via GitHub)" <gi...@apache.org> on 2024/08/05 17:46:31 UTC
[I] Add functions to pack bit from arrays [arrow-nanoarrow]
WillAyd opened a new issue, #575:
URL: https://github.com/apache/arrow-nanoarrow/issues/575
Looks like right now nanoarrow offers `ArrowBitsUnpackInt8` and `ArrowBitsUnpackInt32` to unpack a bitmap into int8 and int32 arrays, respectively. However, there is no function to go in the other direction, packing a bitmap from an array.
I think this would be helpful to have for libraries that need to convert between bit and bytemasks, for example when try to interoperate between Arrow and NumPy
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Re: [I] Add functions to pack bitmask from arrays [arrow-nanoarrow]
Posted by "WillAyd (via GitHub)" <gi...@apache.org>.
WillAyd commented on issue #575:
URL: https://github.com/apache/arrow-nanoarrow/issues/575#issuecomment-2269643680
Ah OK cool - yea I think that makes sense as long as you are working with a bitmap with a size_bits of 0.
Happy to close out as that works for my use case. Can leave it to future issues to refine this as needed
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Re: [I] Add functions to pack bitmask from arrays [arrow-nanoarrow]
Posted by "WillAyd (via GitHub)" <gi...@apache.org>.
WillAyd closed issue #575: Add functions to pack bitmask from arrays
URL: https://github.com/apache/arrow-nanoarrow/issues/575
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Re: [I] Add functions to pack bitmask from arrays [arrow-nanoarrow]
Posted by "paleolimbot (via GitHub)" <gi...@apache.org>.
paleolimbot commented on issue #575:
URL: https://github.com/apache/arrow-nanoarrow/issues/575#issuecomment-2269604891
I think this is `ArrowBitmapAppendInt8/32()`? (This could probably be improved and/or separated from the `ArrowBitmap`, though!)
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