[jira] [Created] (ARROW-12863) [JS] Field nullable value is overwritten

["Nick Rabinowitz (Jira)" <ji...@apache.org>]

Nick Rabinowitz created ARROW-12863:
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             Summary: [JS] Field nullable value is overwritten
                 Key: ARROW-12863
                 URL: https://issues.apache.org/jira/browse/ARROW-12863
             Project: Apache Arrow
          Issue Type: Bug
          Components: JavaScript
    Affects Versions: 4.0.0
            Reporter: Nick Rabinowitz


I cannot find a way to manually create a table with non-nullable fields in JS. When I create the fields and pass them in via {{Table.new}} the value of {{nullable}} is overwritten.

Example:

{code:javascript}
const type = new Utf8();
const field = new Field('test', type, false);
const column = Column.new(field, []);

console.log(column.nullable); // false

const table = Table.new(column);
console.log(table.schema.fields[0].nullable); // true
{code}

The issue seems to be the hardcoded value here: https://github.com/apache/arrow/blob/master/js/src/util/args.ts#L184



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