bowenli86 commented on a change in pull request #9962: [FLINK-14218][table] support precise function reference in FunctionCatalog URL: https://github.com/apache/flink/pull/9962#discussion_r339242523
########## File path: flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/FunctionIdentifier.java ########## @@ -0,0 +1,114 @@ +/* + * 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.flink.table.functions; + +import org.apache.flink.annotation.PublicEvolving; +import org.apache.flink.table.catalog.ObjectIdentifier; +import org.apache.flink.util.StringUtils; + +import java.io.Serializable; +import java.util.Objects; +import java.util.Optional; + +import static org.apache.flink.table.utils.EncodingUtils.escapeIdentifier; +import static org.apache.flink.util.Preconditions.checkArgument; +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * Identifies a temporary or catalog function. An identifier must be fully qualified. + * Function catalog is responsible for resolving an identifier to a function. + */ +@PublicEvolving +public final class FunctionIdentifier implements Serializable { + + private final ObjectIdentifier objectIdentifier; + + private final String functionName; + + public static FunctionIdentifier of(ObjectIdentifier oi){ + return new FunctionIdentifier(oi); + } + + public static FunctionIdentifier of(String functionName){ + return new FunctionIdentifier(functionName); + } + + private FunctionIdentifier(ObjectIdentifier objectIdentifier){ + this.objectIdentifier = checkNotNull(objectIdentifier, "Object identifier cannot be null"); + functionName = null; + } + + private FunctionIdentifier(String functionName){ + checkArgument(!StringUtils.isNullOrWhitespaceOnly(functionName), + "function name cannot be null or empty string"); + this.functionName = functionName; + this.objectIdentifier = null; + } + + public Optional<ObjectIdentifier> getIdentifier(){ + return Optional.ofNullable(objectIdentifier); + } + + public Optional<String> getSimpleName(){ + return Optional.ofNullable(functionName); + } + + /** + * Returns a string that fully serializes this instance. The serialized string can be used for + * transmitting or persisting an object identifier. + */ + public String asSerializableString() { Review comment: this is inherited from ObjectIdentifier. not sure how it's used, but Dawid asked explicitly for it in the FLIP ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
