[jira] [Resolved] (ARROW-5532) [JS] Field Metadata Not Read

["Paul Taylor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul Taylor resolved ARROW-5532.
--------------------------------
    Resolution: Fixed

Issue resolved by pull request 4476
https://github.com/apache/arrow/pull/4476

> [JS] Field Metadata Not Read
> ----------------------------
>
>                 Key: ARROW-5532
>                 URL: https://issues.apache.org/jira/browse/ARROW-5532
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: JavaScript
>    Affects Versions: 0.13.0
>         Environment: Mac OSX 10.14, Chrome 74
>            Reporter: Trey Hakanson
>            Assignee: Paul Taylor
>            Priority: Major
>              Labels: Javas
>             Fix For: 0.14.0
>
>
> Field metadata is not read when using {{@apache-arrow/ts@0.13.0}}. Example below also uses {{pyarrow==0.13.0}}
> Steps to reproduce:
> Adding metadata:
> {code:title=toarrow.py|borderStyle=solid}
> import pyarrow as pa
> import pandas as pd
> source = "sample.csv"
> output = "sample.arrow"
> df = pd.read_csv(source)
> table = pa.Table.from_pandas(df)
> schema = pa.schema([
>  column.field.add_metadata({"foo": "bar"}))
>  for column
>  in table.columns
> ])
> writer = pa.RecordBatchFileWriter(output, schema)
> writer.write(table)
> writer.close()
> {code}
> Reading field metadata using {{pyarrow}}:
> {code:title=readarrow.py|borderStyle=solid}
> source = "sample.arrow"
> field = "foo"
> reader = pa.RecordBatchFileReader(source)
> reader.schema.field_by_name(field).metadata # Correctly shows `{"foo": "bar"}`
> {code}
> Reading field metadata using {{@apache-arrow/ts}}:
> {code:title=toarrow.ts|borderStyle=solid}
> import { Table, Field, Type } from "@apache-arrow/ts";
> const url = "https://example.com/sample.arrow";
> const buf = await fetch(url).then(res => res.arrayBuffer());
> const table = Table.from([new Uint8Array(buf)]);
> for (let field of table.schema.fields) {
>  field.metadata; // Incorrectly shows an empty map
> }
> {code}



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