Add unit test

Author: gszadovszky

pom.xml

@@ -327,8 +327,8 @@ under the License.
               <io.netty.tryReflectionSetAccessible>true</io.netty.tryReflectionSetAccessible>
               <user.timezone>UTC</user.timezone>
               <!-- Note: changing the below configuration might increase the max allocation size for a vector
-              which in turn can cause OOM. -->
-              <arrow.vector.max_allocation_bytes>1048576</arrow.vector.max_allocation_bytes>
+              which in turn can cause OOM. Using 1MB - 1byte to simulate the defaul limit of 2^31 - 1 bytes. -->
+              <arrow.vector.max_allocation_bytes>1048575</arrow.vector.max_allocation_bytes>
             </systemPropertyVariables>
             <useModulePath>false</useModulePath>
           </configuration>

vector/src/test/java/org/apache/arrow/vector/TestVectorReAlloc.java

@@ -24,6 +24,7 @@
 import java.nio.charset.StandardCharsets;
 import org.apache.arrow.memory.BufferAllocator;
 import org.apache.arrow.memory.RootAllocator;
+import org.apache.arrow.memory.util.CommonUtil;
 import org.apache.arrow.vector.complex.DenseUnionVector;
 import org.apache.arrow.vector.complex.FixedSizeListVector;
 import org.apache.arrow.vector.complex.ListVector;
@@ -222,6 +223,17 @@ public void testVariableAllocateAfterReAlloc() throws Exception {
     }
   }
 
+  @Test
+  public void testVariableReAllocAbove1GB() throws Exception {
+    try (final VarCharVector vector = new VarCharVector("", allocator)) {
+      long desiredSizeAboveLastPowerOf2 =
+          CommonUtil.nextPowerOfTwo(BaseVariableWidthVector.MAX_ALLOCATION_SIZE) / 2 + 1;
+      vector.reallocDataBuffer(desiredSizeAboveLastPowerOf2);
+
+      assertTrue(vector.getDataBuffer().capacity() >= desiredSizeAboveLastPowerOf2);
+    }
+  }
+
   @Test
   public void testLargeVariableAllocateAfterReAlloc() throws Exception {
     try (final LargeVarCharVector vector = new LargeVarCharVector("", allocator)) {