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From ravipesala <...@git.apache.org>
Subject [GitHub] carbondata pull request #1490: [CARBONDATA-1579][PREAGG][DATAMAP] Support Da...
Date Tue, 14 Nov 2017 11:36:39 GMT
Github user ravipesala commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1490#discussion_r150808687
  
    --- Diff: integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/datamap/CarbonDataMapShowCommand.scala
---
    @@ -0,0 +1,67 @@
    +/*
    + * 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.spark.sql.execution.command.datamap
    +
    +import scala.collection.JavaConverters._
    +
    +import org.apache.spark.sql.{CarbonEnv, Row, SparkSession}
    +import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeReference}
    +import org.apache.spark.sql.execution.command.{Checker, DataProcessCommand, RunnableCommand}
    +import org.apache.spark.sql.hive.CarbonRelation
    +import org.apache.spark.sql.types.StringType
    +
    +/**
    + * Show the datamaps on the table
    + * @param databaseNameOp
    + * @param tableName
    + */
    +case class CarbonDataMapShowCommand(
    +    databaseNameOp: Option[String],
    +    tableName: String)
    +  extends RunnableCommand with DataProcessCommand {
    +
    +  override def output: Seq[Attribute] = {
    +    Seq(AttributeReference("DataMapName", StringType, nullable = false)(),
    +      AttributeReference("ClassName", StringType, nullable = false)(),
    +      AttributeReference("Associated Table", StringType, nullable = false)())
    +  }
    +
    +  override def run(sparkSession: SparkSession): Seq[Row] = {
    +    processData(sparkSession)
    +  }
    +
    +  override def processData(sparkSession: SparkSession): Seq[Row] = {
    +    Checker.validateTableExists(databaseNameOp, tableName, sparkSession)
    +    val carbonTable = CarbonEnv.getInstance(sparkSession).carbonMetastore.
    +      lookupRelation(databaseNameOp, tableName)(sparkSession).asInstanceOf[CarbonRelation].
    +      tableMeta.carbonTable
    +    val schemaList = carbonTable.getTableInfo.getDataMapSchemaList
    +    if (schemaList != null && schemaList.size() > 0) {
    +      schemaList.asScala.map { s =>
    +        var table = "-NA-"
    --- End diff --
    
    ok


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