yiyutian1 commented on code in PR #25763:
URL: https://github.com/apache/flink/pull/25763#discussion_r1889875236
##########
docs/data/sql_functions.yml:
##########
@@ -679,9 +679,15 @@ temporal:
- sql: TO_DATE(string1[, string2])
table: toDate(STRING1[, STRING2])
description: Converts a date string string1 with format string2 (by
default 'yyyy-MM-dd') to a date.
- - sql: TO_TIMESTAMP_LTZ(numeric, precision)
+ - sql: TO_TIMESTAMP_LTZ(numeric[, precision])
table: toTimestampLtz(NUMERIC, PRECISION)
- description: "Converts a epoch seconds or epoch milliseconds to a
TIMESTAMP_LTZ, the valid precision is 0 or 3, the 0 represents
TO_TIMESTAMP_LTZ(epochSeconds, 0), the 3 represents
TO_TIMESTAMP_LTZ(epochMilliseconds, 3)."
+ description: Converts an epoch seconds or epoch milliseconds to a
TIMESTAMP_LTZ, the valid precision is 0 or 3, the 0 represents
TO_TIMESTAMP_LTZ(epochSeconds, 0), the 3 represents
TO_TIMESTAMP_LTZ(epochMilliseconds, 3). If no precision is provided, the
default precision is 3.
+ - sql: TO_TIMESTAMP_LTZ(string1[, string2])
+ table: toTimestampLtz(STRING1[, STRING2])
+ description: Converts a timestamp string string1 with format string2 (by
default 'yyyy-MM-dd HH:mm:ss.SSS') to a TIMESTAMP_LTZ.
+ - sql: TO_TIMESTAMP_LTZ(string1, string2, string3)
+ table: toTimestampLtz(STRING1, STRING2, STRING3)
+ description: Converts a timestamp string string1 with format string2 to a
TIMESTAMP_LTZ in time zone string3.
Review Comment:
Modified.
##########
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/functions/scalar/ToTimestampLtzFunction.java:
##########
@@ -0,0 +1,192 @@
+/*
+ * 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.functions.scalar;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.data.DecimalData;
+import org.apache.flink.table.data.StringData;
+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.table.utils.DateTimeUtils;
+
+import javax.annotation.Nullable;
+
+/**
+ * Implementation of {@link BuiltInFunctionDefinitions#TO_TIMESTAMP_LTZ}.
+ *
+ * <p>A function that converts various time formats to TIMESTAMP_LTZ type.
+ *
+ * <p>Supported function signatures:
+ *
+ * <ul>
+ * <li>{@code TO_TIMESTAMP_LTZ(numeric)} -> TIMESTAMP_LTZ(3) <br>
+ * Converts numeric epoch time in milliseconds to timestamp with local
timezone
+ * <li>{@code TO_TIMESTAMP_LTZ(numeric, precision)} ->
TIMESTAMP_LTZ(precision) <br>
+ * Converts numeric epoch time to timestamp with specified precision (0
as seconds, 3 as
+ * milliseconds)
+ * <li>{@code TO_TIMESTAMP_LTZ(timestamp)} -> TIMESTAMP_LTZ(3) <br>
+ * Parses string timestamp using default format 'yyyy-MM-dd HH:mm:ss'
+ * <li>{@code TO_TIMESTAMP_LTZ(timestamp, format)} -> TIMESTAMP_LTZ(3) <br>
+ * Parses string timestamp using input string of format
+ * <li>{@code TO_TIMESTAMP_LTZ(timestamp, format, timezone)} ->
TIMESTAMP_LTZ(3) <br>
+ * Parses string timestamp using input strings of format and timezone
+ * </ul>
+ *
+ * <p>Example:
+ *
+ * <pre>{@code
+ * TO_TIMESTAMP_LTZ('2023-01-01 10:00:00')} // Parses string using default
format
+ * TO_TIMESTAMP_LTZ(1234567890123)} // Converts epoch milliseconds
+ * TO_TIMESTAMP_LTZ(1234567890, 0) // Converts epoch seconds
+ * TO_TIMESTAMP_LTZ(1234567890123, 3) // Converts epoch milliseconds
+ * TO_TIMESTAMP_LTZ('2023-01-01 10:00:00') // Parses string using default
format
+ * TO_TIMESTAMP_LTZ('2023-01-01T10:00:00', 'yyyy-MM-dd\'T\'HH:mm:ss')} //
Parses string using input format
+ * TO_TIMESTAMP_LTZ('2023-01-01 10:00:00', 'yyyy-MM-dd HH:mm:ss', 'UTC')} //
Parses string using input format and timezone
+ * }</pre>
+ */
+@Internal
+public class ToTimestampLtzFunction extends BuiltInScalarFunction {
+
+ private static final int DEFAULT_PRECISION = 3;
+
+ public ToTimestampLtzFunction(SpecializedFunction.SpecializedContext
context) {
+ super(BuiltInFunctionDefinitions.TO_TIMESTAMP_LTZ, context);
+ }
+
+ public @Nullable TimestampData eval(Integer epoch, Integer precision) {
+ if (epoch == null || precision == null) {
+ return null;
+ }
+
+ return DateTimeUtils.toTimestampData(epoch, precision);
+ }
+
+ public @Nullable TimestampData eval(Long epoch, Integer precision) {
+ if (epoch == null || precision == null) {
+ return null;
+ }
+
+ return DateTimeUtils.toTimestampData(epoch, precision);
+ }
+
+ public @Nullable TimestampData eval(Double epoch, Integer precision) {
+ if (epoch == null || precision == null) {
+ return null;
+ }
+
+ return DateTimeUtils.toTimestampData(epoch, precision);
+ }
+
+ public @Nullable TimestampData eval(Float value, Integer precision) {
+ if (value == null || precision == null) {
+ return null;
+ }
+ return DateTimeUtils.toTimestampData(value.doubleValue(), precision);
+ }
+
+ public @Nullable TimestampData eval(Byte value, Integer precision) {
+ if (value == null || precision == null) {
+ return null;
+ }
+ return DateTimeUtils.toTimestampData(value.longValue(), precision);
+ }
+
Review Comment:
Modified.
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