| /** |
| * 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.pig.newplan; |
| |
| import java.util.List; |
| |
| import org.apache.pig.Expression.OpType; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.logical.expression.AddExpression; |
| import org.apache.pig.newplan.logical.expression.AndExpression; |
| import org.apache.pig.newplan.logical.expression.BinaryExpression; |
| import org.apache.pig.newplan.logical.expression.CastExpression; |
| import org.apache.pig.newplan.logical.expression.DivideExpression; |
| import org.apache.pig.newplan.logical.expression.EqualExpression; |
| import org.apache.pig.newplan.logical.expression.GreaterThanEqualExpression; |
| import org.apache.pig.newplan.logical.expression.GreaterThanExpression; |
| import org.apache.pig.newplan.logical.expression.IsNullExpression; |
| import org.apache.pig.newplan.logical.expression.LessThanEqualExpression; |
| import org.apache.pig.newplan.logical.expression.LessThanExpression; |
| import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan; |
| import org.apache.pig.newplan.logical.expression.ModExpression; |
| import org.apache.pig.newplan.logical.expression.MultiplyExpression; |
| import org.apache.pig.newplan.logical.expression.NotEqualExpression; |
| import org.apache.pig.newplan.logical.expression.NotExpression; |
| import org.apache.pig.newplan.logical.expression.OrExpression; |
| import org.apache.pig.newplan.logical.expression.ProjectExpression; |
| import org.apache.pig.newplan.logical.expression.RegexExpression; |
| import org.apache.pig.newplan.logical.expression.SubtractExpression; |
| import org.apache.pig.newplan.logical.expression.UnaryExpression; |
| |
| /** |
| * |
| * We traverse the expression plan bottom up and separate it into two plans |
| * - pushdownExprPlan, plan that can be pushed down to the loader and |
| * - filterExprPlan, remaining plan that needs to be evaluated by pig |
| * |
| * If the predicate is not removable then filterExprPlan will not have |
| * the pushdownExprPlan removed. |
| */ |
| public class PredicatePushDownFilterExtractor extends FilterExtractor { |
| |
| private List<String> predicateCols; |
| private List<OpType> supportedOpTypes; |
| |
| public PredicatePushDownFilterExtractor(LogicalExpressionPlan plan, List<String> predicateCols, |
| List<OpType> supportedOpTypes) { |
| super(plan); |
| this.predicateCols = predicateCols; |
| this.supportedOpTypes = supportedOpTypes; |
| } |
| |
| @Override |
| public void visit() throws FrontendException { |
| super.visit(); |
| if (supportedOpTypes.contains(OpType.OP_BETWEEN)) { |
| // TODO: Collapse multiple ORs into BETWEEN |
| } else if (supportedOpTypes.contains(OpType.OP_IN)) { |
| // TODO: Collapse multiple ORs into IN |
| } |
| } |
| |
| @Override |
| protected KeyState checkPushDown(ProjectExpression project) throws FrontendException { |
| String fieldName = project.getFieldSchema().alias; |
| KeyState state = new KeyState(); |
| if(predicateCols.contains(fieldName)) { |
| state.filterExpr = null; |
| state.pushdownExpr = project; |
| } else { |
| state.filterExpr = addToFilterPlan(project); |
| state.pushdownExpr = null; |
| } |
| return state; |
| } |
| |
| @Override |
| protected boolean isSupportedOpType(BinaryExpression binOp) { |
| if(binOp instanceof AddExpression) { |
| return supportedOpTypes.contains(OpType.OP_PLUS ); |
| } else if(binOp instanceof SubtractExpression) { |
| return supportedOpTypes.contains(OpType.OP_MINUS); |
| } else if(binOp instanceof MultiplyExpression) { |
| return supportedOpTypes.contains(OpType.OP_TIMES); |
| } else if(binOp instanceof DivideExpression) { |
| return supportedOpTypes.contains(OpType.OP_DIV); |
| } else if(binOp instanceof ModExpression) { |
| return supportedOpTypes.contains(OpType.OP_MOD); |
| } else if(binOp instanceof AndExpression) { |
| return supportedOpTypes.contains(OpType.OP_AND); |
| } else if(binOp instanceof OrExpression) { |
| return supportedOpTypes.contains(OpType.OP_OR); |
| } else if(binOp instanceof EqualExpression) { |
| return supportedOpTypes.contains(OpType.OP_EQ); |
| } else if(binOp instanceof NotEqualExpression) { |
| return supportedOpTypes.contains(OpType.OP_NE); |
| } else if(binOp instanceof GreaterThanExpression) { |
| return supportedOpTypes.contains(OpType.OP_GT); |
| } else if(binOp instanceof GreaterThanEqualExpression) { |
| return supportedOpTypes.contains(OpType.OP_GE); |
| } else if(binOp instanceof LessThanExpression) { |
| return supportedOpTypes.contains(OpType.OP_LT); |
| } else if(binOp instanceof LessThanEqualExpression) { |
| return supportedOpTypes.contains(OpType.OP_LE); |
| } else if(binOp instanceof RegexExpression) { |
| return supportedOpTypes.contains(OpType.OP_MATCH); |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| protected boolean isSupportedOpType(UnaryExpression unaryOp) { |
| if (unaryOp instanceof CastExpression) { |
| return true; |
| } else if(unaryOp instanceof IsNullExpression) { |
| return supportedOpTypes.contains(OpType.OP_NULL); |
| } else if(unaryOp instanceof NotExpression) { |
| return supportedOpTypes.contains(OpType.OP_NOT); |
| } else { |
| return false; |
| } |
| } |
| |
| } |