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/*
 * 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

import org.apache.spark.sql.{Row, SparkSession}
import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeReference}
import org.apache.spark.sql.types.StringType


case class ShowVersionCommand() extends LeafRunnableCommand {

    override def output: Seq[Attribute] = Seq(AttributeReference("version", StringType)())

    override def run(sparkSession: SparkSession): Seq[Row] = {
        val sparkVersion = sparkSession.version
        val javaVersion = System.getProperty("java.version")
        val outputString = "Spark Version: %s, Java Version: %s".format(sparkVersion, javaVersion)
        Seq(Row(outputString))
    }

}

  /**
   * {@inheritDoc  }
   *
   * <p>The default implementation returns the result of calling
   * {@link #   visitChildren} on {@code ctx}.</p>
   */
  override def visitShowVersion(ctx: ShowVersionContext): LogicalPlan = withOrigin(ctx) {
    ShowVersionCommand()
  }

object PushDownPredicates extends Rule[LogicalPlan] with PredicateHelper {
  def apply(plan: LogicalPlan): LogicalPlan = plan.transformWithPruning(
    _.containsAnyPattern(FILTER, JOIN)) {
    CombineFilters.applyLocally
      .orElse(PushPredicateThroughNonJoin.applyLocally)
      .orElse(PushPredicateThroughJoin.applyLocally)
  }
}