[jira] [Commented] (ARROW-11326) [JS] utf8 vector buffers don't work if allocated within Web Assembly memory of Node.js

["Dominik Moritz (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-11326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17476894#comment-17476894 ] 

Dominik Moritz commented on ARROW-11326:
----------------------------------------

Is this still an issue with the latest Arrow in master? Can you provide a small example that reproduces the issue? 

I can make a new vector of strings with this


{code:js}
const v = Arrow.vectorFromArray('A', new Arrow.Utf8);
console.log(v.get(0));
{code}


> [JS] utf8 vector buffers don't work if allocated within Web Assembly memory of Node.js
> --------------------------------------------------------------------------------------
>
>                 Key: ARROW-11326
>                 URL: https://issues.apache.org/jira/browse/ARROW-11326
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: JavaScript
>         Environment: node.js in Mac book pro
>            Reporter: Dmitri Bronnikov
>            Priority: Major
>
> After making int32array of offsets = [0, 1] and uint8array of values = [ascii_code('A')], create a vector of strings:
> const vec = arrow.Vector.new(arrow.Data.new(new Utf8(), 0, 1, 0, [offsets, values, null, null])
> then access the first and only element:
> console.log(vec.get(0))
> Works within browsers. Works in node.js with fixed size types, e.g. float or integer.
> Fails in Node.js (v14.11.0.) with this callstack 
> at ../../node_modules/@apache-arrow/es2015-umd/buffer/index.js:311:1
>     at __proto__ (../../node_modules/@apache-arrow/es2015-umd/buffer/index.js:167:1)
>     at Function._Buffer [as from] (../../node_modules/@apache-arrow/es2015-umd/buffer/index.js:154:1)
>     at prototype (../../node_modules/@apache-arrow/es2015-umd/util/utf8.ts:43:31)
>     at partial2 (../../node_modules/@apache-arrow/es2015-umd/visitor/get.ts:293:12)
>     at go.isArray [as get] (../../node_modules/@apache-arrow/es2015-umd/vector/index.ts:175:43)
>     at Sr.get (../../node_modules/@apache-arrow/es2015-umd/util/args.ts:27:7)



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