integration/spark2/src/main/scala/org/apache/spark/sql/CarbonExtensions.scala

/*
 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.spark.sql

import org.apache.spark.sql.catalyst.parser.ParserInterface
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.execution.strategy.{CarbonLateDecodeStrategy, DDLStrategy, StreamingTableStrategy}
import org.apache.spark.sql.hive.{CarbonIUDAnalysisRule, CarbonPreInsertionCasts}
import org.apache.spark.sql.optimizer.{CarbonIUDRule, CarbonLateDecodeRule, CarbonUDFTransformRule}
import org.apache.spark.sql.parser.CarbonSparkSqlParser
import org.apache.spark.util.CarbonReflectionUtils

class CarbonExtensions extends ((SparkSessionExtensions) => Unit) {

  CarbonExtensions

  override def apply(extensions: SparkSessionExtensions): Unit = {
    // Carbon parser
    extensions
      .injectParser((sparkSession: SparkSession, _: ParserInterface) =>
        new CarbonSparkSqlParser(new SQLConf, sparkSession))

    // carbon analyzer rules
    extensions
      .injectResolutionRule((session: SparkSession) => CarbonIUDAnalysisRule(session))
    extensions
      .injectResolutionRule((session: SparkSession) => CarbonPreInsertionCasts(session))

    // Carbon Pre optimization rules
    // TODO: Make CarbonOptimizerRule injectable Rule
    val optimizerRules = Seq(new CarbonIUDRule,
      new CarbonUDFTransformRule, new CarbonLateDecodeRule)
    extensions
      .injectResolutionRule((sparkSession: SparkSession) => {
        CarbonUDFTransformRuleWrapper(sparkSession, optimizerRules)
      })

    // TODO: CarbonPreAggregateDataLoadingRules
    // TODO: CarbonPreAggregateQueryRules
    // TODO: MVAnalyzerRule

    // carbon planner strategies
    var streamingTableStratergy : StreamingTableStrategy = null
    val decodeStrategy = new CarbonLateDecodeStrategy
    var ddlStrategy : DDLStrategy = null

    extensions
      .injectPlannerStrategy((session: SparkSession) => {
        if (streamingTableStratergy == null) {
          streamingTableStratergy = new StreamingTableStrategy(session)
        }
        streamingTableStratergy
      })

    extensions
      .injectPlannerStrategy((_: SparkSession) => decodeStrategy)

    extensions
      .injectPlannerStrategy((sparkSession: SparkSession) => {
        if (ddlStrategy == null) {
          ddlStrategy = new DDLStrategy(sparkSession)
        }
        ddlStrategy
      })
  }
}

object CarbonExtensions {
  CarbonEnv.init
  CarbonReflectionUtils.updateCarbonSerdeInfo
}

case class CarbonUDFTransformRuleWrapper(session: SparkSession,
                                         rules: Seq[Rule[LogicalPlan]])
  extends Rule[LogicalPlan] {

  override def apply(plan: LogicalPlan): LogicalPlan = {
    if (session.sessionState.experimentalMethods.extraOptimizations.isEmpty) {
      session.sessionState.experimentalMethods.extraOptimizations = rules
    }
  plan
}
}