slinkydeveloper commented on a change in pull request #17522: URL: https://github.com/apache/flink/pull/17522#discussion_r737473070
########## File path: flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/functions/casting/CodeGeneratorCastRule.java ########## @@ -0,0 +1,70 @@ +/* + * 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.planner.functions.casting; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.table.planner.codegen.CodeGenUtils; +import org.apache.flink.table.types.logical.LogicalType; + +/** + * Cast rule that has code generation capabilities. + * + * @param <IN> Input internal type + * @param <OUT> Output internal type + */ +@Internal +public interface CodeGeneratorCastRule<IN, OUT> extends CastRule<IN, OUT> { + + /** + * Generates a code block composed by different statements performing the casting. The returned + * code block must have a variable containing the result and an isNull term. + */ + CastCodeBlock generateCodeBlock( + Context context, + String inputTerm, + LogicalType inputLogicalType, + LogicalType targetLogicalType); + + /** Context for code generation. */ + interface Context { + /** @return the session time zone term */ + String getSessionTimeZoneTerm(); + + /** + * Declare a new variable in the global scope. + * + * @return the variable name + */ + String declareVariable(String type, String variablePrefix); + + default String declareVariable(LogicalType type, String variablePrefix) { + return declareVariable( Review comment: Ok I remove it now and then we can add it later if we need it, thinking to a proper name for it -- 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. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
