@@ -0,0 +1,1447 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0Apackage org.apache.beam.sdk.extensions.sql.udf;%0A%0Aimport java.util.Collections;%0Aimport java.util.Map;%0A%0A/**%0A * Provider for user-defined functions written in Java. Implementations should be annotated with%0A * %7B@link com.google.auto.service.AutoService%7D.%0A */%0Apublic interface UdfProvider %7B%0A  /** Maps function names to scalar function implementations. */%0A  default Map%3CString, ScalarFn%3E userDefinedScalarFunctions() %7B%0A    return Collections.emptyMap();%0A  %7D%0A%0A  /** Maps function names to aggregate function implementations. */%0A  default Map%3CString, AggregateFn%3C?, ?, ?%3E%3E userDefinedAggregateFunctions() %7B%0A    return Collections.emptyMap();%0A  %7D%0A%7D%0A

Add UdfProvider interface.