Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/929#discussion_r51850151
--- Diff:
tajo-common/src/main/java/org/apache/tajo/util/WritableTypeConverter.java ---
@@ -0,0 +1,103 @@
+/**
+ * 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.tajo.util;
+
+import org.apache.hadoop.io.*;
+import org.apache.tajo.common.TajoDataTypes.Type;
+import org.apache.tajo.common.TajoDataTypes.DataType;
+import org.apache.tajo.datum.*;
+import org.apache.tajo.exception.NotImplementedException;
+import org.apache.tajo.exception.TajoRuntimeException;
+import org.reflections.ReflectionUtils;
+
+import java.util.Set;
+
+public class WritableTypeConverter {
+
+ public static DataType convertWritableToTajoType(Class<? extends
Writable> writableClass) {
+ if (writableClass == null)
+ return null;
+
+ DataType.Builder builder = DataType.newBuilder();
+ Set<Class<?>> parents =
ReflectionUtils.getAllSuperTypes(writableClass);
+
+ if (writableClass == ByteWritable.class ||
parents.contains(ByteWritable.class)) {
+ return builder.setType(Type.INT1).build();
+ }
+ if (writableClass == ShortWritable.class ||
parents.contains(ShortWritable.class)) {
+ return builder.setType(Type.INT2).build();
+ }
+ if (writableClass == IntWritable.class ||
parents.contains(IntWritable.class)) {
+ return builder.setType(Type.INT4).build();
+ }
+ if (writableClass == LongWritable.class ||
parents.contains(LongWritable.class)) {
+ return builder.setType(Type.INT8).build();
+ }
+ if (writableClass == Text.class || parents.contains(Text.class)) {
+ return builder.setType(Type.TEXT).build();
+ }
+ if (writableClass == FloatWritable.class ||
parents.contains(FloatWritable.class)) {
+ return builder.setType(Type.FLOAT4).build();
+ }
+ if (writableClass == DoubleWritable.class ||
parents.contains(DoubleWritable.class)) {
+ return builder.setType(Type.FLOAT8).build();
+ }
+ if (writableClass == BytesWritable.class ||
parents.contains(BytesWritable.class)) {
+ return builder.setType(Type.VARBINARY).build();
+ }
+
+ throw new TajoRuntimeException(new
NotImplementedException(writableClass.getSimpleName()));
+ }
+
+ public static Writable convertDatum2Writable(Datum value) {
+ switch(value.type()) {
+ case INT1: return new ByteWritable(value.asByte());
+ case INT2: return new ShortWritable(value.asInt2());
+ case INT4: return new IntWritable(value.asInt4());
+ case INT8: return new LongWritable(value.asInt8());
+
+ case FLOAT4: return new FloatWritable(value.asFloat4());
+ case FLOAT8: return new DoubleWritable(value.asFloat8());
+
+ case TEXT: return new Text(value.asChars());
+ case VARBINARY: return new BytesWritable(value.asByteArray());
--- End diff --
We need to support date, time, timestamp, and boolean types as well.
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