| /* |
| * 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.fn; |
| |
| import org.apache.drill.common.expression.FunctionCall; |
| import org.apache.drill.exec.resolver.FunctionResolver; |
| |
| public interface FunctionLookupContext { |
| |
| /** |
| * Method returns the materialized drill function corresponding to the functioncall that |
| * is passed in |
| * |
| * @param functionResolver - Type of resolver to use. |
| * Specifies if the arguments should match exactly or can use implicit cast |
| * @param functionCall - Specifies function name and type of arguments |
| * @return DrillFuncHolder |
| */ |
| public DrillFuncHolder findDrillFunction(FunctionResolver functionResolver, FunctionCall functionCall); |
| |
| /** |
| * Find function implementation for given <code>functionCall</code> in non-Drill function registries such as Hive UDF |
| * registry. |
| * |
| * Note: Order of searching is same as order of {@link org.apache.drill.exec.expr.fn.PluggableFunctionRegistry} |
| * implementations found on classpath. |
| * |
| * @param functionCall - Specifies function name and type of arguments |
| * @return AbstractFuncHolder |
| */ |
| public AbstractFuncHolder findNonDrillFunction(FunctionCall functionCall); |
| } |