m-v-w opened a new issue, #45559:
URL: https://github.com/apache/arrow/issues/45559
### Describe the enhancement requested
The C# implementation of the BitUtility helper class seems to allocate an
array every time GetBit is called:
```
private static ReadOnlySpan<byte> BitMask => new byte[] {
1, 2, 4, 8, 16, 32, 64, 128
};
public static bool GetBit(ReadOnlySpan<byte> data, int index) =>
(data[index / 8] & BitMask[index % 8]) != 0;
```
using a static cached BitMask array or creating the bit mask using a shift
operator should increase performance.
### Component(s)
C#
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