/**
* 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
*/
public AbstractFuncHolder findNonDrillFunction(FunctionCall functionCall);
}