| /* |
| * 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.drill.exec.expr; |
| |
| import org.apache.drill.common.expression.BooleanOperator; |
| import org.apache.drill.common.expression.CastExpression; |
| import org.apache.drill.common.expression.ConvertExpression; |
| import org.apache.drill.common.expression.FunctionCall; |
| import org.apache.drill.common.expression.FunctionHolderExpression; |
| import org.apache.drill.common.expression.IfExpression; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.expression.NullExpression; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.common.expression.TypedNullConstant; |
| import org.apache.drill.common.expression.ValueExpressions.BooleanExpression; |
| import org.apache.drill.common.expression.ValueExpressions.DateExpression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal18Expression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal28Expression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal38Expression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal9Expression; |
| import org.apache.drill.common.expression.ValueExpressions.DoubleExpression; |
| import org.apache.drill.common.expression.ValueExpressions.FloatExpression; |
| import org.apache.drill.common.expression.ValueExpressions.IntExpression; |
| import org.apache.drill.common.expression.ValueExpressions.IntervalDayExpression; |
| import org.apache.drill.common.expression.ValueExpressions.IntervalYearExpression; |
| import org.apache.drill.common.expression.ValueExpressions.LongExpression; |
| import org.apache.drill.common.expression.ValueExpressions.QuotedString; |
| import org.apache.drill.common.expression.ValueExpressions.TimeExpression; |
| import org.apache.drill.common.expression.ValueExpressions.TimeStampExpression; |
| import org.apache.drill.common.expression.ValueExpressions.VarDecimalExpression; |
| import org.apache.drill.common.expression.visitors.AbstractExprVisitor; |
| |
| public class HashVisitor extends AbstractExprVisitor<Integer,Void,RuntimeException> { |
| @Override |
| public Integer visitFunctionCall(FunctionCall call, Void value) throws RuntimeException { |
| return compute(call, 1); |
| } |
| |
| @Override |
| public Integer visitFunctionHolderExpression(FunctionHolderExpression holder, Void value) throws RuntimeException { |
| return compute(holder, 2); |
| } |
| |
| @Override |
| public Integer visitIfExpression(IfExpression ifExpr, Void value) throws RuntimeException { |
| return compute(ifExpr, 3); |
| } |
| |
| @Override |
| public Integer visitBooleanOperator(BooleanOperator op, Void value) throws RuntimeException { |
| return compute(op, 4); |
| } |
| |
| @Override |
| public Integer visitSchemaPath(SchemaPath path, Void value) throws RuntimeException { |
| return compute(path, 5); |
| } |
| |
| @Override |
| public Integer visitFloatConstant(FloatExpression fExpr, Void value) throws RuntimeException { |
| return compute(fExpr, 6); |
| } |
| |
| @Override |
| public Integer visitIntConstant(IntExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 7); |
| } |
| |
| @Override |
| public Integer visitLongConstant(LongExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 8); |
| } |
| |
| |
| @Override |
| public Integer visitDecimal9Constant(Decimal9Expression decExpr, Void value) throws RuntimeException { |
| return compute(decExpr, 9); |
| } |
| |
| @Override |
| public Integer visitDecimal18Constant(Decimal18Expression decExpr, Void value) throws RuntimeException { |
| return compute(decExpr, 10); |
| } |
| |
| @Override |
| public Integer visitDecimal28Constant(Decimal28Expression decExpr, Void value) throws RuntimeException { |
| return compute(decExpr, 11); |
| } |
| |
| @Override |
| public Integer visitDecimal38Constant(Decimal38Expression decExpr, Void value) throws RuntimeException { |
| return compute(decExpr, 12); |
| } |
| |
| @Override |
| public Integer visitDateConstant(DateExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 13); |
| } |
| |
| @Override |
| public Integer visitTimeConstant(TimeExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 14); |
| } |
| |
| @Override |
| public Integer visitTimeStampConstant(TimeStampExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 15); |
| } |
| |
| @Override |
| public Integer visitIntervalYearConstant(IntervalYearExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 16); |
| } |
| |
| @Override |
| public Integer visitIntervalDayConstant(IntervalDayExpression intExpr, Void value) throws RuntimeException { |
| return compute(intExpr, 17); |
| } |
| |
| @Override |
| public Integer visitDoubleConstant(DoubleExpression dExpr, Void value) throws RuntimeException { |
| return compute(dExpr, 18); |
| } |
| |
| @Override |
| public Integer visitBooleanConstant(BooleanExpression e, Void value) throws RuntimeException { |
| return compute(e, 19); |
| } |
| |
| @Override |
| public Integer visitQuotedStringConstant(QuotedString e, Void value) throws RuntimeException { |
| return compute(e, 20); |
| } |
| |
| @Override |
| public Integer visitCastExpression(CastExpression e, Void value) throws RuntimeException { |
| return compute(e, 21); |
| } |
| |
| @Override |
| public Integer visitConvertExpression(ConvertExpression e, Void value) throws RuntimeException { |
| return compute(e, 22); |
| } |
| |
| @Override |
| public Integer visitNullConstant(TypedNullConstant e, Void value) throws RuntimeException { |
| return compute(e, 23); |
| } |
| |
| @Override |
| public Integer visitNullExpression(NullExpression e, Void value) throws RuntimeException { |
| return compute(e, 24); |
| } |
| |
| @Override |
| public Integer visitUnknown(LogicalExpression e, Void value) throws RuntimeException { |
| return compute(e, 25); |
| } |
| |
| @Override |
| public Integer visitVarDecimalConstant(VarDecimalExpression decExpr, Void value) throws RuntimeException { |
| return compute(decExpr, 26); |
| } |
| |
| private int compute(LogicalExpression e, int seed) { |
| int hash = seed; |
| for (LogicalExpression child : e) { |
| hash = hash * 31 + child.accept(this, null); |
| } |
| return hash; |
| } |
| } |