[jira] [Created] (ARROW-10221) Javascript toArray() method ignores nulls on some types.

["Ben Schmidt (Jira)" <ji...@apache.org>]

Ben Schmidt created ARROW-10221:
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             Summary: Javascript toArray() method ignores nulls on some types.
                 Key: ARROW-10221
                 URL: https://issues.apache.org/jira/browse/ARROW-10221
             Project: Apache Arrow
          Issue Type: Bug
          Components: JavaScript
    Affects Versions: 0.17.1
            Reporter: Ben Schmidt


The .toArray() javascript method of vectors includes a shortcut to return the underlying typed array; but this doesn't respect null values, and so can return the wrong number.

 

```

v = arrow.Vector.from(\{values: [1, 2, 3, 4, 5, null, 6],type: new arrow.Int32()})

v.toArray()[5] // Incorrectly returns '0'

v.get(5) // Correctly returns null

```

 

Solution: Eliminate the fast method, always return Javascript arrays. It might be better to keep the old method in cases where there are guaranteed no nulls.



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