davidradl commented on code in PR #27793:
URL: https://github.com/apache/flink/pull/27793#discussion_r2964958277
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docs/data/sql_functions.yml:
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@@ -722,7 +722,21 @@ temporal:
TO_TIMESTAMP_LTZ('2023-01-01 00:00:00', 'yyyy-MM-dd HH:mm:ss',
'Asia/Shanghai') parses in Shanghai time zone.
- sql: TO_TIMESTAMP(string1[, string2])
table: toTimestamp(STRING1[, STRING2])
- description: "Converts date time string string1 with format string2 (by
default: 'yyyy-MM-dd HH:mm:ss') to a timestamp, without time zone."
+ description: |
+ Converts a datetime string to a TIMESTAMP without time zone.
+
+ - string1: the datetime string to parse
+ - string2: the format pattern (default 'yyyy-MM-dd HH:mm:ss'). The
pattern follows Java's DateTimeFormatter syntax, where 'S' represents
fractional seconds (e.g., 'SSS' for milliseconds, 'SSSSSS' for microseconds,
'SSSSSSSSS' for nanoseconds).
+
+ The output precision depends on the variant used:
+ - 1-arg variant: always returns TIMESTAMP(3).
+ - 2-arg variant: precision is inferred from the number of trailing 'S'
characters in the format pattern, with a minimum of 3. E.g., format 'yyyy-MM-dd
HH:mm:ss.SS' returns TIMESTAMP(3), format 'yyyy-MM-dd HH:mm:ss.SSSSSS' returns
TIMESTAMP(6).
Review Comment:
what happens when the number of S's is not 3, 6 or 9.
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