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https://issues.apache.org/jira/browse/ARROW-10901?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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roland updated ARROW-10901:
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Attachment: Screen Shot 2020-12-14 at 3.38.54 PM.png
> 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
> Priority: Major
> Attachments: Screen Shot 2020-12-14 at 3.34.24 PM.png, Screen Shot
> 2020-12-14 at 3.38.54 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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