Github user jackylk commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/333#discussion_r90588002
  
    --- Diff: 
processing/src/main/java/org/apache/carbondata/processing/newflow/iterator/InputIterator.java
 ---
    @@ -0,0 +1,40 @@
    +/*
    + * 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.processing.newflow.iterator;
    +
    +import java.util.Iterator;
    +
    +/**
    + * It iterates the data of record readers
    + */
    +public abstract class InputIterator<E> implements Iterator<E> {
    --- End diff --
    
    Can we add initialize and close function to `CarbonIterator` so that that 
can be reused?


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