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[FLINK-36862][table] Implement additional TO_TIMESTAMP_LTZ() functions
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111 changes: 111 additions & 0 deletions
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...src/main/java/org/apache/flink/table/runtime/functions/scalar/ToTimestampLtzFunction.java
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.flink.table.runtime.functions.scalar; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.table.data.TimestampData; | ||
| import org.apache.flink.table.functions.BuiltInFunctionDefinitions; | ||
| import org.apache.flink.table.functions.SpecializedFunction; | ||
| import org.apache.flink.util.FlinkRuntimeException; | ||
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| import java.time.LocalDateTime; | ||
| import java.time.ZoneId; | ||
| import java.time.format.DateTimeFormatter; | ||
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| /** | ||
| * Implementation of {@link BuiltInFunctionDefinitions#TO_TIMESTAMP_LTZ}. | ||
| * | ||
| * Supported function signatures: | ||
| * TO_TIMESTAMP_LTZ(numeric, precision) -> TIMESTAMP_LTZ(3)</li> | ||
| * TO_TIMESTAMP_LTZ(string) -> TIMESTAMP_LTZ(3)</li> | ||
| * TO_TIMESTAMP_LTZ(string, format) -> TIMESTAMP_LTZ(3)</li> | ||
| * TO_TIMESTAMP_LTZ(string, format, timezone) -> TIMESTAMP_LTZ(3)</li> | ||
| * TO_TIMESTAMP_LTZ(numeric) -> TIMESTAMP_LTZ(3)</li> | ||
| */ | ||
| @Internal | ||
| public class ToTimestampLtzFunction extends BuiltInScalarFunction { | ||
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| private static final String DEFAULT_FORMAT = "yyyy-MM-dd HH:mm:ss"; | ||
| private static final ZoneId UTC = ZoneId.of("UTC"); | ||
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| public ToTimestampLtzFunction(SpecializedFunction.SpecializedContext context) { | ||
| super(BuiltInFunctionDefinitions.TO_TIMESTAMP_LTZ, context); | ||
| } | ||
|
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| public TimestampData eval(Integer epoch, Integer precision) { | ||
| if (epoch == null) { | ||
| return null; | ||
| } | ||
| if (precision == 0) { | ||
| return TimestampData.fromEpochMillis(epoch * 1000L); | ||
| } else if (precision == 3) { | ||
| return TimestampData.fromEpochMillis(epoch); | ||
| } else { | ||
| throw new FlinkRuntimeException("Unsupported precision: " + precision); | ||
| } | ||
| } | ||
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| // Parse timestamp with default format | ||
| public TimestampData eval(String timestamp) { | ||
| if (timestamp == null) { | ||
| return null; | ||
| } | ||
| return parseTimestamp(timestamp, DEFAULT_FORMAT, UTC); | ||
| } | ||
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| // Parse timestamp with custom format | ||
| public TimestampData eval(String timestamp, String format) { | ||
| if (timestamp == null) { | ||
| return null; | ||
| } | ||
| if (format == null) { | ||
| throw new FlinkRuntimeException("Format must not be null."); | ||
| } | ||
| return parseTimestamp(timestamp, format, UTC); | ||
| } | ||
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| // Parse timestamp with format and timezone | ||
| public TimestampData eval(String timestamp, String format, String timezone) { | ||
| if (timestamp == null) { | ||
| return null; | ||
| } | ||
| if (format == null) { | ||
| throw new FlinkRuntimeException("Format must not be null."); | ||
| } | ||
| if (timezone == null) { | ||
| throw new FlinkRuntimeException("Timezone must not be null."); | ||
| } | ||
| return parseTimestamp(timestamp, format, ZoneId.of(timezone)); | ||
| } | ||
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| private TimestampData parseTimestamp(String timestamp, String format, ZoneId zoneId) { | ||
| try { | ||
| DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format); | ||
| LocalDateTime localDateTime = LocalDateTime.parse(timestamp, formatter); | ||
| long epochMillis = localDateTime.atZone(zoneId).toInstant().toEpochMilli(); | ||
| return TimestampData.fromEpochMillis(epochMillis); | ||
| } catch (Exception e) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "Failed to parse timestamp '%s' in format '%s' with timezone '%s'", | ||
| timestamp, format, zoneId), | ||
| e); | ||
| } | ||
| } | ||
| } |