Brian Hulette created ARROW-5714:
------------------------------------

             Summary: [JS] Inconsistent behavior in Int64Builder with/without 
BigNum
                 Key: ARROW-5714
                 URL: https://issues.apache.org/jira/browse/ARROW-5714
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Brian Hulette
            Assignee: Brian Hulette
             Fix For: 0.14.0


When the Int64Builder is used in a context without BigNum, appending two 
numbers combines them into a single Int64:

{{
> v = Arrow.Builder.new({type: new 
> Arrow.Int64()}).append(1).append(2).finish().toVector()
> v.get(0)
Int32Array [ 1, 2 ]
}}

Whereas the same process with BigNum creates two new Int64s.



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