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From ravipesala <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #584: [CARBONDATA-726] Handled query and s...
Date Thu, 23 Feb 2017 05:31:13 GMT
Github user ravipesala commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/584#discussion_r102641961
  
    --- Diff: core/src/main/java/org/apache/carbondata/core/datastore/chunk/AbstractRawColumnChunk.java
---
    @@ -0,0 +1,124 @@
    +/*
    + * 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.core.datastore.chunk;
    +
    +import java.nio.ByteBuffer;
    +
    +
    +/**
    + * It contains group of uncompressed blocklets on one column.
    --- End diff --
    
    The main benefit of V3 is to avoid multiple IO requests, in V3 format each column chunk
has group of column chunks of size 32000 called as pages. This group( group size can be configured
) is stored continuously so for one IO request it gets complete column chunk with all pages.
    
    Yes this description will be added in V3 reader/ writer. That will be another PR added
by Vishal. 


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