ARROW-1110: [JAVA] make union vector naming consistent

Closes #746


Project: http://git-wip-us.apache.org/repos/asf/arrow/repo
Commit: http://git-wip-us.apache.org/repos/asf/arrow/commit/1ba2c87a
Tree: http://git-wip-us.apache.org/repos/asf/arrow/tree/1ba2c87a
Diff: http://git-wip-us.apache.org/repos/asf/arrow/diff/1ba2c87a

Branch: refs/heads/master
Commit: 1ba2c87ad2e8ab84093dd3a0e6bad723bb35fbd3
Parents: 9fe2123
Author: Julien Le Dem <jul...@apache.org>
Authored: Fri Apr 14 10:23:21 2017 -0700
Committer: Steven Phillips <ste...@dremio.com>
Committed: Thu Jun 8 14:58:01 2017 -0700

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 .../src/main/java/org/apache/arrow/vector/complex/ListVector.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/arrow/blob/1ba2c87a/java/vector/src/main/java/org/apache/arrow/vector/complex/ListVector.java
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diff --git 
a/java/vector/src/main/java/org/apache/arrow/vector/complex/ListVector.java 
b/java/vector/src/main/java/org/apache/arrow/vector/complex/ListVector.java
index c2f5576..b5a27b5 100644
--- a/java/vector/src/main/java/org/apache/arrow/vector/complex/ListVector.java
+++ b/java/vector/src/main/java/org/apache/arrow/vector/complex/ListVector.java
@@ -311,7 +311,7 @@ public class ListVector extends BaseRepeatedValueVector 
implements FieldVector,
 
   @Override
   public UnionVector promoteToUnion() {
-    UnionVector vector = new UnionVector(name, allocator, callBack);
+    UnionVector vector = new UnionVector("$data$", allocator, callBack);
     replaceDataVector(vector);
     reader = new UnionListReader(this);
     if (callBack != null) {

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