[jira] [Created] (ARROW-14650) [JS] toArray equivalent to values/values64

["Nicholas Roberts (Jira)" <ji...@apache.org>]

Nicholas Roberts created ARROW-14650:
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             Summary: [JS] toArray equivalent to values/values64
                 Key: ARROW-14650
                 URL: https://issues.apache.org/jira/browse/ARROW-14650
             Project: Apache Arrow
          Issue Type: Improvement
          Components: JavaScript
            Reporter: Nicholas Roberts


As discussed in ARROW-10901, 64 bit integer vectors have values64 getters available for systems with support for BigInt typed arrays. Column-oriented dataframe libraries (such as UW's [arquero|https://github.com/uwdata/arquero]) generally use the Chunked::toArray convenience method in favour of directly dealing with chunks or vectors, and therefore always receive the int32/uint32 data.

I think there are a few alternatives for improving high level access to a 64 bit column's values:
 * An optional bit width (or is64Bit, like the <T>::from variants) parameter in Chunked::toArray, IntVector::toArray.
 * A new Chunked::toArray64 method, and the same on IntVector (or at least, the 64 bit variants).
 * Use values64 directly in the consuming library (loop over the chunks, copy into a destination typed array).

The toArray64 option would probably be a bit of a mess (requiring a fallback to toArray on BaseVector), an optional parameter might be the cleanest approach.



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