| /* |
| * 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.type.OperandTypes; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rel.type.RelDataTypeFactory; |
| import org.apache.calcite.sql.SqlCall; |
| import org.apache.calcite.sql.SqlOperatorBinding; |
| import org.apache.calcite.sql.type.SqlTypeName; |
| import org.apache.calcite.sql.validate.SqlValidator; |
| import org.apache.calcite.sql.validate.SqlValidatorScope; |
| import org.apache.drill.common.types.TypeProtos; |
| |
| import java.util.ArrayList; |
| |
| public class DrillSqlOperatorWithoutInference extends DrillSqlOperator { |
| private static final TypeProtos.MajorType NONE = TypeProtos.MajorType.getDefaultInstance(); |
| private final TypeProtos.MajorType returnType; |
| |
| public DrillSqlOperatorWithoutInference(String name, int argCount, TypeProtos.MajorType returnType, boolean isDeterminisitic, boolean isNiladic, boolean isVarArg) { |
| super(name, |
| new ArrayList<>(), |
| isVarArg ? OperandTypes.VARIADIC : Checker.getChecker(argCount, argCount), |
| isDeterminisitic, |
| DynamicReturnType.INSTANCE, |
| isNiladic); |
| this.returnType = Preconditions.checkNotNull(returnType); |
| } |
| |
| protected RelDataType getReturnDataType(final RelDataTypeFactory factory) { |
| if (TypeProtos.MinorType.BIT.equals(returnType.getMinorType())) { |
| return factory.createSqlType(SqlTypeName.BOOLEAN); |
| } |
| return factory.createTypeWithNullability(factory.createSqlType(SqlTypeName.ANY), true); |
| } |
| |
| private RelDataType getNullableReturnDataType(final RelDataTypeFactory factory) { |
| return factory.createTypeWithNullability(getReturnDataType(factory), true); |
| } |
| |
| @Override |
| public RelDataType deriveType(SqlValidator validator, SqlValidatorScope scope, SqlCall call) { |
| if (NONE.equals(returnType)) { |
| return validator.getTypeFactory().createSqlType(SqlTypeName.ANY); |
| } |
| /* |
| * We return a nullable output type both in validation phase and in |
| * Sql to Rel phase. We don't know the type of the output until runtime |
| * hence have to choose the least restrictive type to avoid any wrong |
| * results. |
| */ |
| return getNullableReturnDataType(validator.getTypeFactory()); |
| } |
| |
| @Override |
| public RelDataType inferReturnType(SqlOperatorBinding opBinding) { |
| return getNullableReturnDataType(opBinding.getTypeFactory()); |
| } |
| } |