| /* |
| * 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.common.expression.visitors; |
| |
| import org.apache.drill.common.expression.AnyValueExpression; |
| 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.ErrorCollector; |
| 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.IfExpression.IfCondition; |
| 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.TypedFieldExpr; |
| import org.apache.drill.common.expression.TypedNullConstant; |
| import org.apache.drill.common.expression.ValueExpressions; |
| 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; |
| |
| public final class AggregateChecker implements ExprVisitor<Boolean, ErrorCollector, RuntimeException>{ |
| |
| public static final AggregateChecker INSTANCE = new AggregateChecker(); |
| |
| public static boolean isAggregating(LogicalExpression e, ErrorCollector errors) { |
| return e.accept(INSTANCE, errors); |
| } |
| |
| @Override |
| public Boolean visitFunctionCall(FunctionCall call, ErrorCollector errors) { |
| throw new UnsupportedOperationException("FunctionCall is not expected here. "+ |
| "It should have been converted to FunctionHolderExpression in materialization"); |
| } |
| |
| @Override |
| public Boolean visitFunctionHolderExpression(FunctionHolderExpression holder, ErrorCollector errors) { |
| if (holder.isAggregating()) { |
| for (int i = 0; i < holder.args.size(); i++) { |
| LogicalExpression e = holder.args.get(i); |
| if(e.accept(this, errors)) { |
| errors.addGeneralError(e.getPosition(), |
| String.format("Aggregating function call %s includes nested aggregations at arguments number %d. " + |
| "This isn't allowed.", holder.getName(), i)); |
| } |
| } |
| return true; |
| } else { |
| for (LogicalExpression e : holder.args) { |
| if (e.accept(this, errors)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| } |
| |
| @Override |
| public Boolean visitBooleanOperator(BooleanOperator op, ErrorCollector errors) { |
| for (LogicalExpression arg : op.args()) { |
| if (arg.accept(this, errors)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public Boolean visitIfExpression(IfExpression ifExpr, ErrorCollector errors) { |
| IfCondition c = ifExpr.ifCondition; |
| if (c.condition.accept(this, errors) || c.expression.accept(this, errors)) { |
| return true; |
| } |
| return ifExpr.elseExpression.accept(this, errors); |
| } |
| |
| @Override |
| public Boolean visitSchemaPath(SchemaPath path, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitIntConstant(IntExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitFloatConstant(FloatExpression fExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitLongConstant(LongExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitDoubleConstant(DoubleExpression dExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitBooleanConstant(BooleanExpression e, ErrorCollector errors) { |
| return false; |
| } |
| @Override |
| public Boolean visitDecimal9Constant(Decimal9Expression decExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitDecimal18Constant(Decimal18Expression decExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitDecimal28Constant(Decimal28Expression decExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitDecimal38Constant(Decimal38Expression decExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitVarDecimalConstant(VarDecimalExpression decExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitQuotedStringConstant(QuotedString e, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitUnknown(LogicalExpression e, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitCastExpression(CastExpression e, ErrorCollector errors) { |
| return e.getInput().accept(this, errors); |
| } |
| |
| @Override |
| public Boolean visitConvertExpression(ConvertExpression e, ErrorCollector errors) throws RuntimeException { |
| return e.getInput().accept(this, errors); |
| } |
| |
| @Override |
| public Boolean visitAnyValueExpression(AnyValueExpression e, ErrorCollector errors) throws RuntimeException { |
| return e.getInput().accept(this, errors); |
| } |
| |
| @Override |
| public Boolean visitDateConstant(DateExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitTimeConstant(TimeExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitTimeStampConstant(TimeStampExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitIntervalYearConstant(IntervalYearExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitIntervalDayConstant(IntervalDayExpression intExpr, ErrorCollector errors) { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitNullConstant(TypedNullConstant e, ErrorCollector value) throws RuntimeException { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitNullExpression(NullExpression e, ErrorCollector value) throws RuntimeException { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitParameter(ValueExpressions.ParameterExpression e, ErrorCollector value) throws RuntimeException { |
| return false; |
| } |
| |
| @Override |
| public Boolean visitTypedFieldExpr(TypedFieldExpr e, ErrorCollector value) throws RuntimeException { |
| return false; |
| } |
| } |