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From QiangCai <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #672: [CARBONDATA-815] add hive integratio...
Date Fri, 24 Mar 2017 12:49:25 GMT
Github user QiangCai commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/672#discussion_r107863484
  
    --- 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;
    --- End diff --
    
    unchecked type


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