Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r136188197
--- Diff:
exec/vector/src/main/java/org/apache/drill/exec/vector/UntypedNullVector.java
---
@@ -0,0 +1,267 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+
******************************************************************************/
+
+package org.apache.drill.exec.vector;
+
+
+import com.google.common.base.Preconditions;
+import io.netty.buffer.DrillBuf;
+import org.apache.drill.exec.memory.BufferAllocator;
+import org.apache.drill.exec.proto.UserBitShared.SerializedField;
+import org.apache.drill.exec.record.MaterializedField;
+import org.apache.drill.exec.record.TransferPair;
+import org.apache.drill.exec.vector.complex.reader.FieldReader;
+
+/** UntypedNullVector is to represent a value vector with {@link
org.apache.drill.common.types.MinorType.NULL}
+ * All values in the vector represent two semantic implications: 1) the
value is unknown, 2) the type is unknown.
+ * Because of this, we only have to keep track of the number of values in
value vector,
+ * and there is no allocated buffer to back up this value vector.
Therefore, the majority of
+ * methods in this class is either no-op, or throws {@link
UnsupportedOperationException}.
+ *
+ */
+public final class UntypedNullVector extends BaseDataValueVector
implements FixedWidthVector {
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(UntypedNullVector.class);
+
+ /**
+ * Width of each fixed-width value.
+ */
+ public static final int VALUE_WIDTH = 0;
+
+ private final Accessor accessor = new Accessor();
+ private final Mutator mutator = new Mutator();
+ private int valueCount ;
+
+ public UntypedNullVector(MaterializedField field, BufferAllocator
allocator) {
+ super(field, allocator);
+ valueCount = 0;
+ }
+
+ @Override
+ public FieldReader getReader() { throw new
UnsupportedOperationException(); }
+
+ @Override
+ public int getBufferSizeFor(final int valueCount) {
+ return 0;
+ }
+
+ @Override
+ public int getValueCapacity(){
+ return Character.MAX_VALUE;
--- End diff --
Done.
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