morningman opened a new pull request #3947: URL: https://github.com/apache/incubator-doris/pull/3947
Fix: #3946 CL: 1. Add prepare phase for `from_unixtime()` and `date_format()` functions, to handle the format string once for all. 2. Find the cctz timezone when init `runtime state`, so that don't need to find timezone for each rows. 3. Add constant rewrite rule for `utc_timestamp()` 4. Add doc for `to_date()` The performance shows bellow: 11,000,000 rows SQL1: `select count(from_unixtime(k1)) from tbl1;` Before: 8.85s After: 2.85s SQL2: `select count(from_unixtime(k1, '%Y-%m-%d %H:%i:%s')) from tbl1 limit 1;` Before: 10.73s After: 4.85s The date string format seems still slow, we may need a further enhancement about it. ---------------------------------------------------------------- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
