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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CARBONDATA-212) Use SQLContext to read CarbonData file
Date Tue, 06 Sep 2016 09:11:20 GMT

    [ https://issues.apache.org/jira/browse/CARBONDATA-212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15466903#comment-15466903
] 

ASF GitHub Bot commented on CARBONDATA-212:
-------------------------------------------

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

    https://github.com/apache/incubator-carbondata/pull/126#discussion_r77598344
  
    --- Diff: examples/src/main/scala/org/apache/carbondata/examples/DatasourceExample.scala
---
    @@ -0,0 +1,55 @@
    +/*
    + * 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.examples
    +
    +import org.apache.spark.sql.{SaveMode, SQLContext}
    +
    +import org.apache.carbondata.examples.util.InitForExamples
    +
    +object DatasourceExample {
    +
    +  def main(args: Array[String]) {
    +    // use CarbonContext to write CarbonData files
    +    val cc = InitForExamples.createCarbonContext("DatasourceExample")
    +    import cc.implicits._
    +    val sc = cc.sparkContext
    +    // create a dataframe, it can be from parquet or hive table
    +    val df = sc.parallelize(1 to 1000)
    +               .map(x => ("a", "b", x))
    +               .toDF("c1", "c2", "c3")
    +
    +    // save dataframe to CarbonData files
    +    df.write
    +      .format("carbondata")
    +      .option("tableName", "carbon1")
    +      .mode(SaveMode.Overwrite)
    +      .save()
    +
    +    // use SQLContext to read CarbonData files
    +    val sqlContext = new SQLContext(sc)
    +    sqlContext.sql(
    +      """
    +        | CREATE TEMPORARY TABLE source
    +        | (c1 string, c2 string, c3 long)
    +        | USING org.apache.spark.sql.CarbonSource
    +        | OPTIONS (path './examples/target/store',
    --- End diff --
    
    please change path to './target/store'


> Use SQLContext to read CarbonData file
> --------------------------------------
>
>                 Key: CARBONDATA-212
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-212
>             Project: CarbonData
>          Issue Type: New Feature
>            Reporter: Jacky Li
>            Assignee: Jacky Li
>             Fix For: 0.2.0-incubating
>
>
> User should be enable to use Spark's SQLContext to read CarbonData files. SQLContext
will use datasource API to read corresponding CarbonData files.



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