[ARROW-7109] [JS] Create table from Arrays

• Type: Wish
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Component/s: JavaScript
• External issue URL: https://github.com/apache/arrow/issues/16956
• Assignee: Dominik Moritz
• Reporter: Sascha Hofmann
• Created: 11/Nov/19 13:17
• Updated: 11/Jan/23 07:51
• Resolved: 24/Apr/21 23:47

Description

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:

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') }]}]  
})

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!

Issue Links

• is fixed by: ARROW-12528 [JS] Support typed arrays in Table.new