| /* |
| * 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.planner.sql; |
| |
| import org.apache.calcite.sql.SqlAggFunction; |
| import org.apache.calcite.sql.SqlCall; |
| import org.apache.calcite.sql.SqlCallBinding; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.SqlOperatorBinding; |
| import org.apache.calcite.sql.SqlSyntax; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.sql.fun.SqlStdOperatorTable; |
| import org.apache.calcite.sql.type.SqlReturnTypeInference; |
| import org.apache.calcite.sql.validate.SqlMonotonicity; |
| import org.apache.calcite.sql.validate.SqlValidator; |
| import org.apache.calcite.sql.validate.SqlValidatorScope; |
| |
| import org.apache.calcite.util.Litmus; |
| import org.apache.drill.exec.expr.fn.DrillFuncHolder; |
| |
| import java.util.List; |
| |
| /** |
| * This class serves as a wrapper class for SqlAggFunction. The motivation is to plug-in the return type inference and operand |
| * type check algorithms of Drill into Calcite's sql validation procedure. |
| * |
| * Except for the methods which are relevant to the return type inference and operand type check algorithms, the wrapper |
| * simply forwards the method calls to the wrapped SqlAggFunction. |
| */ |
| public class DrillCalciteSqlAggFunctionWrapper extends SqlAggFunction implements DrillCalciteSqlWrapper { |
| |
| public final static DrillCalciteSqlAggFunctionWrapper SUM = |
| new DrillCalciteSqlAggFunctionWrapper(SqlStdOperatorTable.SUM, |
| SqlStdOperatorTable.SUM.getReturnTypeInference()); |
| |
| private final SqlAggFunction operator; |
| |
| @Override |
| public SqlOperator getOperator() { |
| return operator; |
| } |
| |
| private DrillCalciteSqlAggFunctionWrapper( |
| SqlAggFunction sqlAggFunction, |
| SqlReturnTypeInference sqlReturnTypeInference) { |
| super(sqlAggFunction.getName(), |
| sqlAggFunction.getSqlIdentifier(), |
| sqlAggFunction.getKind(), |
| sqlReturnTypeInference, |
| sqlAggFunction.getOperandTypeInference(), |
| Checker.ANY_CHECKER, |
| sqlAggFunction.getFunctionType(), |
| sqlAggFunction.requiresOrder(), |
| sqlAggFunction.requiresOver()); |
| this.operator = sqlAggFunction; |
| } |
| |
| public DrillCalciteSqlAggFunctionWrapper( |
| SqlAggFunction sqlAggFunction, |
| List<DrillFuncHolder> functions) { |
| this(sqlAggFunction, |
| TypeInferenceUtils.getDrillSqlReturnTypeInference( |
| sqlAggFunction.getName(), |
| functions)); |
| } |
| |
| public DrillCalciteSqlAggFunctionWrapper( |
| final SqlAggFunction sqlAggFunction, |
| final RelDataType relDataType) { |
| this(sqlAggFunction, new SqlReturnTypeInference() { |
| @Override |
| public RelDataType inferReturnType(SqlOperatorBinding opBinding) { |
| return relDataType; |
| } |
| }); |
| } |
| |
| @Override |
| public boolean validRexOperands(int count, Litmus litmus) { |
| return true; |
| } |
| |
| @Override |
| public String getAllowedSignatures(String opNameToUse) { |
| return operator.getAllowedSignatures(opNameToUse); |
| } |
| |
| @Override |
| public boolean isAggregator() { |
| return operator.isAggregator(); |
| } |
| |
| @Override |
| public boolean allowsFraming() { |
| return operator.allowsFraming(); |
| } |
| |
| @Override |
| public SqlMonotonicity getMonotonicity(SqlOperatorBinding call) { |
| return operator.getMonotonicity(call); |
| } |
| |
| @Override |
| public boolean isDeterministic() { |
| return operator.isDeterministic(); |
| } |
| |
| @Override |
| public boolean isDynamicFunction() { |
| return operator.isDynamicFunction(); |
| } |
| |
| @Override |
| public boolean requiresDecimalExpansion() { |
| return operator.requiresDecimalExpansion(); |
| } |
| |
| @Override |
| public boolean argumentMustBeScalar(int ordinal) { |
| return operator.argumentMustBeScalar(ordinal); |
| } |
| |
| @Override |
| public boolean checkOperandTypes( |
| SqlCallBinding callBinding, |
| boolean throwOnFailure) { |
| return true; |
| } |
| |
| @Override |
| public SqlSyntax getSyntax() { |
| return operator.getSyntax(); |
| } |
| |
| @Override |
| public List<String> getParamNames() { |
| return operator.getParamNames(); |
| } |
| |
| @Override |
| public String getSignatureTemplate(final int operandsCount) { |
| return operator.getSignatureTemplate(operandsCount); |
| } |
| |
| @Override |
| public RelDataType deriveType( |
| SqlValidator validator, |
| SqlValidatorScope scope, |
| SqlCall call) { |
| return operator.deriveType(validator, |
| scope, |
| call); |
| } |
| } |