[jira] [Updated] (ARROW-16371) [JS] Empty table should provide an empty iterator

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-16371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-16371:
-----------------------------------
    Labels: pull-request-available  (was: )

> [JS] Empty table should provide an empty iterator
> -------------------------------------------------
>
>                 Key: ARROW-16371
>                 URL: https://issues.apache.org/jira/browse/ARROW-16371
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: JavaScript
>            Reporter: Teodor Kostov
>            Assignee: Paul Taylor
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When a table is created without any data and an iterator is requested I would expect to get an empty iterator that just returns that it's done.
> Expected result:
> {code:json}
> {"value": null, "done": true}
> {code}
> However, the code fails in {{strideForType()}} with {{Uncaught TypeError: type2 is undefined}}.
> {code:javascript}
> schema = new arrow.Schema(dataType.children)
> data = new arrow.Table(this.schema)
> const iter = data[Symbol.iterator]()
> {code}
> It seems that the [table just creates a new vector with its data|https://github.com/apache/arrow/blob/e9481532e93e4f29a1c2c322e00f268d6cd9f534/js/src/table.ts#L227] and then the [{{strideForType}} method fails|https://github.com/apache/arrow/blob/e9481532e93e4f29a1c2c322e00f268d6cd9f534/js/src/type.ts#L652].



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