af1beb6ce4
Fix: #3946 CL: 1. Add prepare phase for `from_unixtime()`, `date_format()` and `convert_tz()` 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()` 5. Comment out the `push_handler_test`, it can not run in DEBUG mode, will be fixed later. 6. Remove `timezone_db.h/cpp` and add `timezone_utils.h/cpp` 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.
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1.2 KiB
title, language
| title | language |
|---|---|
| to_date | en |
to_date
description
Syntax
DATE TO_DATE(DATETIME)
Return the DATE part of DATETIME value.
example
mysql> select to_date("2020-02-02 00:00:00");
+--------------------------------+
| to_date('2020-02-02 00:00:00') |
+--------------------------------+
| 2020-02-02 |
+--------------------------------+
##keyword
TO_DATE