| // 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.impala.planner; |
| |
| import org.apache.impala.analysis.Analyzer; |
| import org.apache.impala.analysis.BinaryPredicate; |
| import org.apache.impala.analysis.CompoundPredicate; |
| import org.apache.impala.analysis.Expr; |
| import org.apache.impala.analysis.Predicate; |
| import org.apache.impala.common.AnalysisException; |
| import org.apache.impala.common.InternalException; |
| import org.apache.impala.service.FeSupport; |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Representation of a two-sided interval of values. Either one of the sides |
| * is optional, and can be exclusive or inclusive. For a range representing a single |
| * value, both bounds are set. |
| */ |
| public class ValueRange { |
| |
| private Expr lowerBound_; |
| private boolean lowerBoundInclusive_; |
| private Expr upperBound_; |
| private boolean upperBoundInclusive_; |
| |
| Expr getLowerBound() { return lowerBound_; } |
| void setLowerBound(Expr e) { lowerBound_ = e; } |
| boolean getLowerBoundInclusive() { return lowerBoundInclusive_; } |
| void setLowerBoundInclusive(boolean b) { lowerBoundInclusive_ = b; } |
| Expr getUpperBound() { return upperBound_; } |
| void setUpperBound(Expr e) { upperBound_ = e; } |
| boolean getUpperBoundInclusive() { return upperBoundInclusive_; } |
| void setUpperBoundInclusive(boolean b) { upperBoundInclusive_ = b; } |
| |
| static public ValueRange createEqRange(Expr valueExpr) { |
| ValueRange result = new ValueRange(); |
| result.lowerBound_ = valueExpr; |
| result.lowerBoundInclusive_ = true; |
| result.upperBound_ = valueExpr; |
| result.upperBoundInclusive_ = true; |
| return result; |
| } |
| |
| public boolean isEqRange() { |
| return lowerBound_ == upperBound_ && lowerBoundInclusive_ && upperBoundInclusive_; |
| } |
| |
| /** |
| * Determines whether a given constant expr is within the range. |
| * Does this by constructing predicate that represents the range, |
| * with the valueExpr inserted appropriately, and then calls the |
| * backend for evaluation. |
| */ |
| public boolean isInRange(Analyzer analyzer, Expr valueExpr) throws |
| InternalException { |
| Preconditions.checkState(valueExpr.isConstant()); |
| Preconditions.checkState(lowerBound_ != null || upperBound_ != null); |
| |
| // construct predicate |
| Predicate p = null; |
| if (lowerBound_ != null && upperBound_ != null |
| && lowerBoundInclusive_ && upperBoundInclusive_ |
| && lowerBound_ == upperBound_) { |
| // construct "=" predicate |
| p = new BinaryPredicate(BinaryPredicate.Operator.EQ, valueExpr, lowerBound_); |
| } else { |
| // construct range predicate |
| if (lowerBound_ != null) { |
| p = new BinaryPredicate( |
| lowerBoundInclusive_ |
| ? BinaryPredicate.Operator.GE : BinaryPredicate.Operator.GT, |
| valueExpr, lowerBound_); |
| } |
| if (upperBound_ != null) { |
| Predicate p2 = new BinaryPredicate( |
| upperBoundInclusive_ |
| ? BinaryPredicate.Operator.GE : BinaryPredicate.Operator.GT, |
| upperBound_, valueExpr); |
| if (p != null) { |
| p = new CompoundPredicate(CompoundPredicate.Operator.AND, p, p2); |
| } else { |
| p = p2; |
| } |
| } |
| } |
| |
| Preconditions.checkState(p.isConstant()); |
| // analyze to insert casts, etc. |
| try { |
| p.analyze(analyzer); |
| } catch (AnalysisException e) { |
| // this should never happen |
| throw new InternalException( |
| "couldn't analyze predicate " + p.toSql() + "\n" + e.toString()); |
| } |
| |
| // call backend |
| return FeSupport.EvalPredicate(p, analyzer.getQueryCtx()); |
| } |
| |
| } |