[FLINK-21624] Correct FLOOR/CEIL (TIMESTAMP/TIMESTAMP_LTZ/DATE TO WEEK) functions

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.13.0
• Component/s: Table SQL / API, Table SQL / Planner
• Labels: pull-request-available
• Assignee: Leonard Xu
• Reporter: Leonard Xu
• Created: 05/Mar/21 04:23
• Updated: 12/Mar/21 04:19
• Resolved: 12/Mar/21 04:19

Description

While using a simple query such as this
 
SELECT
   `ts`,
   FLOOR(`ts` TO WEEK) as `week_start`,
   CEIL(`ts` TO WEEK) as `week_end`
FROM some_table
 
I get some weird results like these:
 
2021-03-01T00:00|    2021-02-25T00:00|    2021-03-04T00:00
 
Which is obviously wrong since March 1st is on Monday, February 25th is Thursday as well as March 04th.
 
I've tried different combinations of timezone configurations and with both timestamps and dates, with the same results.
 
Is there anything obviously wrong in that query? Is there any configuration to keep in mind for the start of week day?
 
from user ML: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Flink-SQL-FLOORing-OR-CEILing-a-DATE-or-TIMESTAMP-to-WEEK-uses-Thursdays-as-week-start-td41838.html

Issue Links

• links to: GitHub Pull Request #15125