[jira] [Commented] (ARROW-7109) [JS] Create table from Arrays

["Brian Hulette (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-7109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16971900#comment-16971900 ] 

Brian Hulette commented on ARROW-7109:
--------------------------------------

Hey Sascha, sorry about the confusion, that notebook is based on a pretty old version of arrow JS. Since then, [~paul.e.taylor] has added a lot of syntax to make it a lot easier to build tables from JS arrays. There's an example in the [README|https://github.com/apache/arrow/tree/master/js#create-a-table-from-javascript-arrays], I also suggested a change to [~lmeyerov]'s notebook to use the new syntax: https://observablehq.com/@theneuralbit/manipulating-flat-arrays-arrow-style

Does that help?

> [JS] Create table from Arrays
> -----------------------------
>
>                 Key: ARROW-7109
>                 URL: https://issues.apache.org/jira/browse/ARROW-7109
>             Project: Apache Arrow
>          Issue Type: Wish
>            Reporter: Sascha Hofmann
>            Assignee: Brian Hulette
>            Priority: Minor
>
> I am trying to generate an arrow table from JS arrays and followed the example from [here | [https://observablehq.com/@lmeyerov/manipulating-flat-arrays-arrow-style]] but I am struggling to generate different schemas, most importantly how to provide a type different then 'floatingpoint'. Right now, I have:
> {code:java}
> const data = Table.from({
>   schema: {
>     fields: [{name: 'a', nullable: false, children: Array(0), 
>      type: {name: 'floatingpoint', precision: 'SINGLE'}}]    
>     },    
>   batches: [{        
>    count: 10,        
>    columns: [{ name: 'a', count: 10, VALIDITY: [], 
>     DATA: Array.from({ length: 10 }, () => 'a') }]}]  
> })
> {code}
> Which, of course is non-sense but I couldn't figure out how to provide the type (I tried type: Utf8 among others).  In general wouldn't it be a nice to have create Table from object function?
> On another note, are there any plans to make the docs a little bit more descriptive? Happy to contribute!



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