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From chenliang613 <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #850: [CARBONDATA-986] Add alter table exa...
Date Wed, 26 Apr 2017 11:46:05 GMT
Github user chenliang613 commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/850#discussion_r113430144
  
    --- Diff: examples/spark2/src/main/scala/org/apache/carbondata/examples/AlterTableExample.scala
---
    @@ -0,0 +1,103 @@
    +/*
    + * 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 java.io.File
    +
    +import org.apache.carbondata.core.constants.CarbonCommonConstants
    +import org.apache.carbondata.core.util.CarbonProperties
    +import org.apache.spark.sql.CarbonSession._
    +import org.apache.spark.sql.SparkSession
    +
    +/**
    +  * Created by erlu on 2017/4/25.
    +  */
    +object AlterTableExample {
    +
    +  def main(args: Array[String]): Unit = {
    +
    +    val rootPath = new File(this.getClass.getResource("/").getPath
    +      + "../../../..").getCanonicalPath
    +
    +    val storeLocation = s"$rootPath/examples/spark2/target/store"
    +    val warehouse = s"$rootPath/examples/spark2/target/warehouse"
    +    val metastoredb = s"$rootPath/examples/spark2/target/metastore_db"
    +
    +    CarbonProperties.getInstance().addProperty(CarbonCommonConstants.CARBON_TIMESTAMP_FORMAT,
"yyyy/MM/dd")
    +
    +    val spark = SparkSession
    +      .builder()
    +      .master("local")
    +      .appName("AlterTableExample")
    +      .config("spark.sql.warehouse.dir", warehouse)
    +      .getOrCreateCarbonSession(storeLocation, metastoredb)
    +
    +    spark.sparkContext.setLogLevel("INFO")
    +
    +    spark.sql("DROP TABLE IF EXISTS carbon_table")
    +    spark.sql("DROP TABLE IF EXISTS new_carbon_table")
    +
    +    spark.sql(
    +      s"""
    +         | CREATE TABLE carbon_table(
    +         |    shortField short,
    +         |    intField int,
    +         |    bigintField long,
    +         |    doubleField double,
    +         |    stringField string,
    +         |    timestampField timestamp,
    +         |    decimalField decimal(18,2),
    +         |    dateField date,
    +         |    charField char(5),
    +         |    floatField float,
    +         |    complexData array<string>
    +         | )
    +         | STORED BY 'carbondata'
    +         | TBLPROPERTIES('DICTIONARY_INCLUDE'='dateField, charField')
    +       """.stripMargin)
    +
    +    // Alter table change data type
    +    spark.sql("DESCRIBE FORMATTED carbon_table").show()
    +    spark.sql("ALTER TABLE carbon_table CHANGE intField intField bigint").show()
    +    spark.sql("DESCRIBE FORMATTED carbon_table").show()
    +
    +    // Alter table add columns
    +    spark.sql("DESCRIBE FORMATTED carbon_table").show()
    +    spark.sql("ALTER TABLE carbon_table ADD COLUMNS (newField String)" +
    +      " TBLPROPERTIES ('DEFAULT.VALUE.newField'='def')").show()
    +    spark.sql("DESCRIBE FORMATTED carbon_table").show()
    +
    +    // Alter table drop columns
    +    spark.sql("DESCRIBE FORMATTED carbon_table").show()
    +    spark.sql("ALTER TABLE carbon_table DROP COLUMNS (newField)").show()
    --- End diff --
    
    can you change the drop column to other column, not just added column.


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