datamap/mv/core/src/test/scala/org/apache/carbondata/mv/rewrite/MVCoalesceTestCase.scala

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	 * this work for additional information regarding copyright ownership.
	 * The ASF licenses this file to You under the Apache License, Version 2.0
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	 *
	 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.carbondata.mv.rewrite

import org.apache.spark.sql.Row
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.execution.datasources.LogicalRelation
import org.apache.spark.sql.test.util.CarbonQueryTest
import org.scalatest.BeforeAndAfterAll

class MVCoalesceTestCase  extends CarbonQueryTest with BeforeAndAfterAll  {
  override def beforeAll(): Unit = {
    drop()
    sql("create table coalesce_test_main(id int,name string,height int,weight int) " +
      "using carbondata")
    sql("insert into coalesce_test_main select 1,'tom',170,130")
    sql("insert into coalesce_test_main select 2,'tom',170,120")
    sql("insert into coalesce_test_main select 3,'lily',160,100")
  }

  def drop(): Unit = {
    sql("drop table if exists coalesce_test_main")
  }

  test("test mv table with coalesce expression on sql not on mv and less groupby cols") {
    sql("drop datamap if exists coalesce_test_main_mv")
    sql("create datamap coalesce_test_main_mv using 'mv' as " +
      "select sum(id) as sum_id,name as myname,weight from coalesce_test_main group by name,weight")
    sql("rebuild datamap coalesce_test_main_mv")

    val frame = sql("select coalesce(sum(id),0) as sumid,name from coalesce_test_main group by name")
    assert(TestUtil.verifyMVDataMap(frame.queryExecution.analyzed, "coalesce_test_main_mv"))
    checkAnswer(frame, Seq(Row(3, "tom"), Row(3, "lily")))

    sql("drop datamap if exists coalesce_test_main_mv")
  }

  test("test mv table with coalesce expression less groupby cols") {
    sql("drop datamap if exists coalesce_test_main_mv")
    val exception: Exception = intercept[UnsupportedOperationException] {
      sql("create datamap coalesce_test_main_mv using 'mv' as " +
        "select coalesce(sum(id),0) as sum_id,name as myname,weight from coalesce_test_main group by name,weight")
      sql("rebuild datamap coalesce_test_main_mv")
    }
    assert("MV doesn't support Coalesce".equals(exception.getMessage))

    val frame = sql("select coalesce(sum(id),0) as sumid,name from coalesce_test_main group by name")
    assert(!TestUtil.verifyMVDataMap(frame.queryExecution.analyzed, "coalesce_test_main_mv"))
    checkAnswer(frame, Seq(Row(3, "tom"), Row(3, "lily")))

    sql("drop datamap if exists coalesce_test_main_mv")
  }

  test("test mv table with coalesce expression in other expression") {
    sql("drop datamap if exists coalesce_test_main_mv")
    sql("create datamap coalesce_test_main_mv using 'mv' as " +
      "select sum(coalesce(id,0)) as sum_id,name as myname,weight from coalesce_test_main group by name,weight")
    sql("rebuild datamap coalesce_test_main_mv")

    val frame = sql("select sum(coalesce(id,0)) as sumid,name from coalesce_test_main group by name")
    assert(TestUtil.verifyMVDataMap(frame.queryExecution.analyzed, "coalesce_test_main_mv"))
    checkAnswer(frame, Seq(Row(3, "tom"), Row(3, "lily")))

    sql("drop datamap if exists coalesce_test_main_mv")
  }

  override def afterAll(): Unit ={
    drop
  }
}

object TestUtil {
  def verifyMVDataMap(logicalPlan: LogicalPlan, dataMapName: String): Boolean = {
    val tables = logicalPlan collect {
      case l: LogicalRelation => l.catalogTable.get
    }
    tables.exists(_.identifier.table.equalsIgnoreCase(dataMapName+"_table"))
  }
}