Github user QiangCai commented on a diff in the pull request: https://github.com/apache/incubator-carbondata/pull/672#discussion_r107863523 --- Diff: integration/hive/src/main/java/org/apache/carbondata/hive/CarbonArrayInspector.java --- @@ -0,0 +1,191 @@ +/* + * 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.ArrayList; +import java.util.List; + +import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; +import org.apache.hadoop.hive.serde2.objectinspector.SettableListObjectInspector; +import org.apache.hadoop.io.ArrayWritable; +import org.apache.hadoop.io.Writable; + +/** + * The CarbonHiveArrayInspector will inspect an ArrayWritable, considering it as an Hive array. + * It can also inspect a List if Hive decides to inspect the result of an inspection. + */ +public class CarbonArrayInspector implements SettableListObjectInspector { + + ObjectInspector arrayElementInspector; + + public CarbonArrayInspector(final ObjectInspector arrayElementInspector) { + this.arrayElementInspector = arrayElementInspector; + } + + @Override + public String getTypeName() { + return "array<" + arrayElementInspector.getTypeName() + ">"; + } + + @Override + public Category getCategory() { + return Category.LIST; + } + + @Override + public ObjectInspector getListElementObjectInspector() { + return arrayElementInspector; + } + + @Override + public Object getListElement(final Object data, final int index) { + if (data == null) { + return null; + } + + if (data instanceof ArrayWritable) { + final Writable[] listContainer = ((ArrayWritable) data).get(); + + if (listContainer == null || listContainer.length == 0) { + return null; + } + + final Writable subObj = listContainer[0]; + + if (subObj == null) { + return null; + } + + if (index >= 0 && index < ((ArrayWritable) subObj).get().length) { + return ((ArrayWritable) subObj).get()[index]; + } else { + return null; + } + } + + throw new UnsupportedOperationException("Cannot inspect " + + data.getClass().getCanonicalName()); + } + + @Override + public int getListLength(final Object data) { + if (data == null) { + return -1; + } + + if (data instanceof ArrayWritable) { + final Writable[] listContainer = ((ArrayWritable) data).get(); + + if (listContainer == null || listContainer.length == 0) { + return -1; + } + + final Writable subObj = listContainer[0]; + + if (subObj == null) { + return 0; + } + + return ((ArrayWritable) subObj).get().length; + } + + throw new UnsupportedOperationException("Cannot inspect " + + data.getClass().getCanonicalName()); + } + + @Override + public List<?> getList(final Object data) { + if (data == null) { + return null; + } + + if (data instanceof ArrayWritable) { + final Writable[] listContainer = ((ArrayWritable) data).get(); + + if (listContainer == null || listContainer.length == 0) { + return null; + } + + final Writable subObj = listContainer[0]; + + if (subObj == null) { + return null; + } + + final Writable[] array = ((ArrayWritable) subObj).get(); + final List<Writable> list = new ArrayList<Writable>(); + + for (final Writable obj : array) { + list.add(obj); + } + + return list; + } + + throw new UnsupportedOperationException("Cannot inspect " + + data.getClass().getCanonicalName()); + } + + @Override + public Object create(final int size) { + final ArrayList<Object> result = new ArrayList<Object>(size); + for (int i = 0; i < size; ++i) { + result.add(null); + } + return result; + } + + @Override + public Object set(final Object list, final int index, final Object element) { + final ArrayList l = (ArrayList) list; + l.set(index, element); + return list; + } + + @Override + public Object resize(final Object list, final int newSize) { + final ArrayList l = (ArrayList) list; --- End diff -- unchecked type
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