[jira] [Created] (ARROW-307) UnionListWriter does not behave properly when multiple lists are written in the same list

["Deneche A. Hakim (JIRA)" <ji...@apache.org>]

Deneche A. Hakim created ARROW-307:
--------------------------------------

             Summary: UnionListWriter does not behave properly when multiple lists are written in the same list
                 Key: ARROW-307
                 URL: https://issues.apache.org/jira/browse/ARROW-307
             Project: Apache Arrow
          Issue Type: Bug
          Components: Java - Vectors
            Reporter: Deneche A. Hakim


if you run the following code:
{code}
    ListVector listVector = new ListVector("list", allocator, null);
    listVector.allocateNew();
    UnionListWriter listWriter = new UnionListWriter(listVector);

    listWriter.start();
    listWriter.startList();

    listWriter.list("a").startList();
    listWriter.list("a").bigInt().writeBigInt(1);
    listWriter.list("a").bigInt().writeBigInt(2);
    listWriter.list("a").bigInt().writeBigInt(3);
    listWriter.list("a").endList();

    listWriter.list("a").startList();
    listWriter.list("a").bigInt().writeBigInt(4);
    listWriter.list("a").bigInt().writeBigInt(5);
    listWriter.list("a").endList();

    listWriter.endList();
    listWriter.end();

    listWriter.setValueCount(1);
{code}

listVector will contain:
{noformat}
[{"a":[1,2,3,4,5]}]
{noformat}
Instead of
{noformat}
[{"a":[1,2,3],[4,5]}]
{noformat}



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