Yet another small JNI memory leak (#10238)

Hopefully this is the last one, and this one only happens when we have an empty column vector (no rows).  So much less common. I will be running more tests to check/verify a lot of this.

Authors:
  - Robert (Bobby) Evans (https://github.com/revans2)

Approvers:
  - Jason Lowe (https://github.com/jlowe)
  - Kuhu Shukla (https://github.com/kuhushukla)

URL: #10238

java/src/main/java/ai/rapids/cudf/ColumnVector.java

@@ -68,8 +68,7 @@ private static OffHeapState makeOffHeap(DType type, long rows, Optional<Long> nu
     long viewHandle = initViewHandle(
         type, (int)rows, nullCount.orElse(UNKNOWN_NULL_COUNT).intValue(),
         dataBuffer, validityBuffer, offsetBuffer, null);
-    return new OffHeapState(type, (int) rows, dataBuffer, validityBuffer,
-        offsetBuffer, null, viewHandle);
+    return new OffHeapState(dataBuffer, validityBuffer, offsetBuffer, null, viewHandle);
   }
 
   /**
@@ -108,8 +107,7 @@ private static OffHeapState makeOffHeap(DType type, long rows, Optional<Long> nu
     long viewHandle = initViewHandle(type, (int)rows, nullCount.orElse(UNKNOWN_NULL_COUNT).intValue(),
         dataBuffer, validityBuffer,
         offsetBuffer, childHandles);
-    return new OffHeapState(type, (int) rows, dataBuffer, validityBuffer, offsetBuffer,
-        toClose, viewHandle);
+    return new OffHeapState(dataBuffer, validityBuffer, offsetBuffer, toClose, viewHandle);
   }
 
   /**
@@ -968,12 +966,12 @@ public OffHeapState(long columnHandle) {
     }
 
     /**
-     * Create a cudf::column_view from device side data.
+     * Create from existing cudf::column_view and buffers.
      */
-    public OffHeapState(DType type, int rows,
-                        DeviceMemoryBuffer data, DeviceMemoryBuffer valid, DeviceMemoryBuffer offsets,
+    public OffHeapState(DeviceMemoryBuffer data, DeviceMemoryBuffer valid, DeviceMemoryBuffer offsets,
                         List<DeviceMemoryBuffer> buffers,
                         long viewHandle) {
+      assert(viewHandle != 0);
       if (data != null) {
         this.toClose.add(data);
       }
@@ -986,15 +984,11 @@ public OffHeapState(DType type, int rows,
       if (buffers != null) {
         toClose.addAll(buffers);
       }
-      if (rows == 0 && !type.isNestedType()) {
-        this.columnHandle = makeEmptyCudfColumn(type.typeId.getNativeId(), type.getScale());
-      } else {
-        this.viewHandle = viewHandle;
-      }
+      this.viewHandle = viewHandle;
     }
 
     /**
-     * Create a cudf::column_view from contiguous device side data.
+     * Create from existing cudf::column_view and contiguous buffer.
      */
     public OffHeapState(long viewHandle, DeviceMemoryBuffer contiguousBuffer) {
       assert viewHandle != 0;