[branch-2.1](timezone) refactor tzdata load to accelerate and unify timezone parsing (#37062)#37269
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yiguolei merged 1 commit intoapache:branch-2.1from Jul 15, 2024
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…ezone parsing (apache#37062) 1. revert apache#25097. we decide to rely on OS. not maintain independent tzdata anymore to keep result consistency 2. refactor timezone load. removed rwlock. before: ```sql mysql [optest]>select count(convert_tz(d, 'Asia/Shanghai', 'America/Los_Angeles')), count(convert_tz(dt, 'America/Los_Angeles', '+00:00')) from dates; +-------------------------------------------------------------------------------------+--------------------------------------------------------+ | count(convert_tz(cast(d as DATETIMEV2(6)), 'Asia/Shanghai', 'America/Los_Angeles')) | count(convert_tz(dt, 'America/Los_Angeles', '+00:00')) | +-------------------------------------------------------------------------------------+--------------------------------------------------------+ | 16000000 | 16000000 | +-------------------------------------------------------------------------------------+--------------------------------------------------------+ 1 row in set (6.88 sec) ``` now: ```sql mysql [optest]>select count(convert_tz(d, 'Asia/Shanghai', 'America/Los_Angeles')), count(convert_tz(dt, 'America/Los_Angeles', '+00:00')) from dates; +-------------------------------------------------------------------------------------+--------------------------------------------------------+ | count(convert_tz(cast(d as DATETIMEV2(6)), 'Asia/Shanghai', 'America/Los_Angeles')) | count(convert_tz(dt, 'America/Los_Angeles', '+00:00')) | +-------------------------------------------------------------------------------------+--------------------------------------------------------+ | 16000000 | 16000000 | +-------------------------------------------------------------------------------------+--------------------------------------------------------+ 1 row in set (2.61 sec) ``` 3. now don't support timezone offset format string like 'UTC+8', like we already said in https://doris.apache.org/docs/dev/query/query-variables/time-zone/#usage 4. support case-insensitive timezone parsing in nereids. 5. a bug when parse timezone using nereids. should check DST by input, but wrongly by now before. now fixed. doc pr: apache/doris-website#810
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pick #37062
before:
now:
https://doris.apache.org/docs/dev/query/query-variables/time-zone/#usage
doc pr: apache/doris-website#810