| /* |
| * 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.calcite.sql.type.SqlOperandTypeChecker; |
| import org.apache.calcite.util.Optionality; |
| import org.apache.calcite.sql.SqlAggFunction; |
| import org.apache.calcite.sql.SqlFunctionCategory; |
| import org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.calcite.sql.type.SqlReturnTypeInference; |
| import org.apache.drill.exec.expr.fn.DrillFuncHolder; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| public class DrillSqlAggOperator extends SqlAggFunction { |
| private final List<DrillFuncHolder> functions; |
| |
| protected DrillSqlAggOperator(String name, List<DrillFuncHolder> functions, SqlOperandTypeChecker operandTypeChecker, SqlReturnTypeInference sqlReturnTypeInference) { |
| super(name, |
| new SqlIdentifier(name, SqlParserPos.ZERO), |
| SqlKind.OTHER_FUNCTION, |
| sqlReturnTypeInference, |
| null, |
| operandTypeChecker, |
| SqlFunctionCategory.USER_DEFINED_FUNCTION, |
| false, |
| false, |
| Optionality.FORBIDDEN); |
| this.functions = functions; |
| } |
| |
| public List<DrillFuncHolder> getFunctions() { |
| return functions; |
| } |
| |
| public static class DrillSqlAggOperatorBuilder { |
| private String name = null; |
| private final List<DrillFuncHolder> functions = new ArrayList<>(); |
| private int argCountMin = Integer.MAX_VALUE; |
| private int argCountMax = Integer.MIN_VALUE; |
| |
| public DrillSqlAggOperatorBuilder setName(final String name) { |
| this.name = name; |
| return this; |
| } |
| |
| public DrillSqlAggOperatorBuilder addFunctions(Collection<DrillFuncHolder> functions) { |
| this.functions.addAll(functions); |
| return this; |
| } |
| |
| public DrillSqlAggOperatorBuilder setArgumentCount(final int argCountMin, final int argCountMax) { |
| this.argCountMin = Math.min(this.argCountMin, argCountMin); |
| this.argCountMax = Math.max(this.argCountMax, argCountMax); |
| return this; |
| } |
| |
| public DrillSqlAggOperator build() { |
| if (name == null || functions.isEmpty()) { |
| throw new AssertionError("The fields, name and functions, need to be set before build DrillSqlAggOperator"); |
| } |
| |
| boolean isVarArg = false; |
| for (DrillFuncHolder function : functions) { |
| if (function.isVarArg()) { |
| isVarArg = true; |
| } |
| } |
| |
| return new DrillSqlAggOperator( |
| name, |
| functions, |
| isVarArg ? OperandTypes.VARIADIC : Checker.getChecker(argCountMin, argCountMax), |
| TypeInferenceUtils.getDrillSqlReturnTypeInference( |
| name, |
| functions)); |
| |
| } |
| } |
| } |