| /* |
| * 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.carbondata.mv.rewrite |
| |
| import org.apache.spark.Logging |
| import org.apache.spark.sql.catalyst.trees.TreeNode |
| |
| abstract class MatchPattern[MatchingPlan <: TreeNode[MatchingPlan]] extends Logging { |
| |
| def apply( |
| subsumer: MatchingPlan, |
| subsumee: MatchingPlan, |
| compensation: Option[MatchingPlan], |
| rewrite: QueryRewrite): Seq[MatchingPlan] |
| |
| } |
| |
| abstract class MatchMaker[MatchingPlan <: TreeNode[MatchingPlan]] { |
| |
| /** Define a sequence of rules, to be overridden by the implementation. */ |
| protected val patterns: Seq[MatchPattern[MatchingPlan]] |
| |
| def execute( |
| subsumer: MatchingPlan, |
| subsumee: MatchingPlan, |
| compensation: Option[MatchingPlan], |
| rewrite: QueryRewrite): Iterator[MatchingPlan] = { |
| val iter = patterns.view.flatMap(_ (subsumer, subsumee, compensation, rewrite)).toIterator |
| iter |
| |
| } |
| } |