[jira] [Created] (ARROW-8788) [C#] Array builders to use bit-packed buffer builder rather than boolean array builder for validity map

["Adam Szmigin (Jira)" <ji...@apache.org>]

Adam Szmigin created ARROW-8788:
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             Summary: [C#] Array builders to use bit-packed buffer builder rather than boolean array builder for validity map
                 Key: ARROW-8788
                 URL: https://issues.apache.org/jira/browse/ARROW-8788
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C#
    Affects Versions: 0.17.0
            Reporter: Adam Szmigin


The C# array builders were recently enhanced to have support for adding nullable values easily, under [PR #7032|https://github.com/apache/arrow/pull/7032].

However, the builders internally referenced {{BooleanArray.Builder}}, which itself then had logic "baked-in" for efficient bit-packing of boolean values into a byte buffer.

It would be cleaner for there to be a general-purpose bit-packed buffer builder, and for all array builders to use that for their validity map.  The boolean array builder would use it twice: once for values, once for validity.



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