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Posted to jira@arrow.apache.org by "roland (Jira)" <ji...@apache.org> on 2020/12/14 14:39:00 UTC

[jira] [Created] (ARROW-10901) toArray delivers double length arrays in some cases

roland created ARROW-10901:
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             Summary: toArray delivers double length arrays in some cases
                 Key: ARROW-10901
                 URL: https://issues.apache.org/jira/browse/ARROW-10901
             Project: Apache Arrow
          Issue Type: Bug
          Components: JavaScript
    Affects Versions: 2.0.0
            Reporter: roland
         Attachments: Screen Shot 2020-12-14 at 3.34.24 PM.png

When calling `toArray` on a column, one would expect that a column of length 10, would give back an array of length 10. Instead, it sometimes gives back an array of length 20.

I think this is the case for elements where the type is something like Int64, where it's not guaranteed JS will actually fit the number into it Float (which iirc is not 64 bit exactly). 
At the same time, if I call `toArray`, I would expect the numbers to stay the same.



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