[jira] [Assigned] (ARROW-1162) Transfer Between Empty Lists Should Not Invoke Callback

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

     [ https://issues.apache.org/jira/browse/ARROW-1162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Deneche A. Hakim reassigned ARROW-1162:
---------------------------------------

    Assignee: Deneche A. Hakim

> Transfer Between Empty Lists Should Not Invoke Callback
> -------------------------------------------------------
>
>                 Key: ARROW-1162
>                 URL: https://issues.apache.org/jira/browse/ARROW-1162
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Java - Vectors
>    Affects Versions: 0.4.1
>            Reporter: Sudheesh Katkam
>            Assignee: Deneche A. Hakim
>             Fix For: 0.5.0
>
>
> Here's the test that fails:
> {code}
> public class TestBufferOwnershipTransfer {
>   //...
>   private static class Pointer<T> {
>     T value;
>   }
>   private static CallBack newTriggerCallback(final Pointer<Boolean> trigger) {
>     trigger.value = false;
>     return new CallBack() {
>       @Override
>       public void doWork() {
>         trigger.value = true;
>       }
>     };
>   }
>   @Test
>   public void emptyListTransferShouldNotTriggerSchemaChange() {
>     final BufferAllocator allocator = new RootAllocator(Integer.MAX_VALUE);
>     final Pointer<Boolean> trigger1 = new Pointer<>();
>     final Pointer<Boolean> trigger2 = new Pointer<>();
>     final ListVector v1 = new ListVector("v1", allocator,
>             FieldType.nullable(ArrowType.Null.INSTANCE),
>             newTriggerCallback(trigger1));
>     final ListVector v2 = new ListVector("v2", allocator,
>             FieldType.nullable(ArrowType.Null.INSTANCE),
>             newTriggerCallback(trigger2));
>     v1.makeTransferPair(v2).transfer();
>     assertFalse(trigger1.value);
>     assertFalse(trigger2.value); // fails
>   }
> }
> {code}



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