THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
This FLIP propose to disable the cast between numeric and timestamp, and proposed use current function TO_TIMESTAMP(FROM_UNIXTIMESTAMP(epochSeconds - zoneOffset)) as a migration plan.
function | current behavior | existed problem | migration plan |
CAST(44 AS TIMESTAMP) | TIMESTAMP(0) NOT NULL #session timezone: UTC 1970-01-01 00:00:44 #session timezone: UTC+8 1970-01-01 00:00:44 | The time in BIGINT type usually represents a unixtime semantic, which represents the elapsed time since java epoch(1970-01-01 00:00:00 UTC+0), when convert to a timestamp we should consider local time zone | This is an invalid behavior, disable the invalid CAST behavior, to get same behavior, user can workaround with: #session timezone: UTC
1970-01-01 00:00:44 #session timezone: UTC+8 TO_TIMESTAMP(FROM_UNIXTIMESTAMP(44 - 8 * 60 * 60)) 1970-01-01 00:00:44 |
CAST(TIMESTAMP ‘1970-01-01 00:00:44’ AS BIGINT) | BIGINT NOT NULL #session timezone: UTC 44 #session timezone: UTC+8 44 | The inverse conversion of above, this conversion is used rarely. | UNIX_TIMESTAMP(TIMESTAMP ‘1970-01-01 00:00:44’) #session timezone: UTC 44 #session timezone: UTC+8 -28756 |
...