ajantha-bhat commented on a change in pull request #3407: [CARBONDATA-3542] Support Map data type reading through Hive
URL:
https://github.com/apache/carbondata/pull/3407#discussion_r336890663
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File path: integration/hive/src/main/java/org/apache/carbondata/hive/CarbonMapInspector.java
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@@ -0,0 +1,186 @@
+/*
+ * 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.carbondata.hive;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
+import org.apache.hadoop.hive.serde2.objectinspector.SettableMapObjectInspector;
+import org.apache.hadoop.io.ArrayWritable;
+import org.apache.hadoop.io.Writable;
+
+public class CarbonMapInspector implements SettableMapObjectInspector {
+
+ protected final ObjectInspector keyInspector;
+ protected final ObjectInspector valueInspector;
+
+ public CarbonMapInspector(final ObjectInspector keyInspector,
+ final ObjectInspector valueInspector) {
+ this.keyInspector = keyInspector;
+ this.valueInspector = valueInspector;
+ }
+
+ @Override public String getTypeName() {
+ return "map<" + keyInspector.getTypeName() + "," + valueInspector.getTypeName() + ">";
+ }
+
+ @Override public Category getCategory() {
+ return Category.MAP;
+ }
+
+ @Override
+ public ObjectInspector getMapKeyObjectInspector() {
+ return keyInspector;
+ }
+
+ @Override
+ public ObjectInspector getMapValueObjectInspector() {
+ return valueInspector;
+ }
+
+ @Override public Object getMapValueElement(Object data, Object key) {
+ if (data != null && key != null) {
+ Map<?, ?> map = (Map)data;
+ return map.get(key);
+ } else {
+ return null;
+ }
+ }
+
+ @Override
+ public Map<?, ?> getMap(final Object data) {
+ if (data == null) {
+ return null;
+ }
+
+ if (data instanceof ArrayWritable) {
+ final Writable[] mapArray = ((ArrayWritable) data).get();
+ if (mapArray == null) {
+ return null;
+ }
+
+ final Map<Writable, Writable> map = new LinkedHashMap<>();
+ for (final Writable obj : mapArray) {
+ final ArrayWritable mapObj = (ArrayWritable) obj;
+ final Writable[] arr = mapObj.get();
+ for (int i = 0; i < arr.length; i++) {
+ map.put(((ArrayWritable) arr[i]).get()[0], ((ArrayWritable) arr[i]).get()[1]);
+ }
+ }
+
Review comment:
remove empty lines here and other places in the newly modified code.
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