[ARROW-15305] [js] Incorrect value returned for columns named "size"

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 6.0.1
• Component/s: JavaScript
• External issue URL: https://github.com/apache/arrow/issues/30795
• Assignee: Unassigned
• Reporter: Bob Matcuk
• Created: 11/Jan/22 19:42
• Updated: 11/Jan/23 11:36

Description

I discovered this issue using a row's toJSON() function. The problem is here: https://github.com/apache/arrow/blob/fc1d7d44317b20f899928755b05a774715f27ce8/js/src/vector/row.ts#L195

When field.name is "size", this["size"] will return the value of the size property on the Row instead of the value of the column. I fixed it locally by changing the values function to:

public *values() {
    for (const field of this[kParent].type.children) {
        yield (this as RowLike<T>)[this[kKeyToIdx].get(field.name)];
    }
}