WeiZhong94 commented on a change in pull request #10055: [FLINK-14573][python] Support time data types in Python user-defined functions URL: https://github.com/apache/flink/pull/10055#discussion_r349476263
########## File path: flink-python/src/main/java/org/apache/flink/table/runtime/typeutils/serializers/python/TimeSerializer.java ########## @@ -0,0 +1,128 @@ +/* + * 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.runtime.typeutils.serializers.python; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.api.common.typeutils.SimpleTypeSerializerSnapshot; +import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot; +import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton; +import org.apache.flink.core.memory.DataInputView; +import org.apache.flink.core.memory.DataOutputView; + +import java.io.IOException; +import java.sql.Time; +import java.util.TimeZone; + +/** + * Takes int instead of long as the serialized value. It not only reduces the length of + * the serialized value, but also makes the serialized value consistent between + * the legacy planner and the blink planner. + */ +@Internal +public class TimeSerializer extends TypeSerializerSingleton<Time> { + + private static final long serialVersionUID = 1L; + + /** The local time zone. */ + private static final TimeZone LOCAL_TZ = TimeZone.getDefault(); + + private static final long MILLIS_PER_DAY = 86400000L; // = 24 * 60 * 60 * 1000 + + public static final TimeSerializer INSTANCE = new TimeSerializer(); + + @Override + public boolean isImmutableType() { + return false; + } + + @Override + public Time createInstance() { + return new Time(0L); + } + + @Override + public Time copy(Time from) { + if (from == null) { + return null; + } + return new Time(from.getTime()); + } + + @Override + public Time copy(Time from, Time reuse) { + if (from == null) { + return null; + } + reuse.setTime(from.getTime()); + return reuse; + } + + @Override + public int getLength() { + return 4; + } + + @Override + public void serialize(Time record, DataOutputView target) throws IOException { + if (record == null) { + throw new IllegalArgumentException("The Time record must not be null."); + } + target.writeInt(timeToInternal(record)); + } + + @Override + public Time deserialize(DataInputView source) throws IOException { + return internalToTime(source.readInt()); + } + + private int timeToInternal(Time time) { + long ts = time.getTime() + LOCAL_TZ.getOffset(time.getTime()); + return (int) (ts % MILLIS_PER_DAY); + } + + private Time internalToTime(int time) { + return new Time(time - LOCAL_TZ.getOffset(time)); + } + + @Override + public Time deserialize(Time reuse, DataInputView source) throws IOException { + return deserialize(source); Review comment: How about reuse the "reuse" object? ---------------------------------------------------------------- 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
