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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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  http://www.apache.org/licenses/LICENSE-2.0

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"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
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*/
package org.apache.griffin.measure.step.transform

import org.apache.griffin.measure.context.DQContext
import org.apache.griffin.measure.step.write.WriteStep

/**
  * spark sql transform step
  */
case class SparkSqlTransformStep[T <: WriteStep](name: String,
                                                 rule: String,
                                                 details: Map[String, Any],
                                                 writeStepOpt: Option[T] = None,
                                                 cache: Boolean = false
                                                ) extends TransformStep {
  def doExecute(context: DQContext): Boolean = {
    val sparkSession = context.sparkSession
    try {
      val df = sparkSession.sql(rule)
      if (cache) context.dataFrameCache.cacheDataFrame(name, df)
      context.runTimeTableRegister.registerTable(name, df)
      writeStepOpt match {
        case Some(writeStep) => writeStep.execute(context)
        case None => true
      }
    } catch {
      case e: Throwable =>
        error(s"run spark sql [ ${rule} ] error: ${e.getMessage}", e)
        false
    }
  }

}