/**
* 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.planner.sql.DrillOperatorTable;
public interface PluggableFunctionRegistry {
/**
* Register functions in given operator table. There are two methods to add operators.
* One is addOperatorWithInference whose added operators will be used
* when planner.type_inference.enable is set to true;
* The other is addOperatorWithoutInference whose added operators will be used
* when planner.type_inference.enable is set to false;
* @param operatorTable
*/
public void register(DrillOperatorTable operatorTable);
/**
* If exists return the function implementation holder matching the given <code>functionCall</code> expression,
* otherwise null.
*
* @param functionCall
* @return
*/
public AbstractFuncHolder getFunction(FunctionCall functionCall);
}