Details
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Bug
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Status: Stalled (View Workflow)
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Minor
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Resolution: Unresolved
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10.3(EOL)
Description
Note: I don't really know if there is anything that can be done about it apart from documenting; but before documenting, the expected behavior and limitations should be clearly defined.
I'm using the autumn DST switch, the one that goes one hour back.
- set system time zone to Europe/Helsinki and system time to 28 OCT 2018 00:57:50 UTC, which is 28 OCT 2018 03:57:50 local time before DST switch;
- start the server, insert some data into a previously empty versioned table, create some historical records;
- wait for the the switch to happen;
- create some more historical records;
- check results
=> at this time, SELECT * FROM and SELECT * FROM ... FOR SYSTEM_TIME AS OF CURRENT_TIMESTAMP show different results, even though the current documentation says:
If the FOR SYSTEM_TIME clause is not used, the table will show the current data, as if one had specified FOR SYSTEM_TIME AS OF CURRENT_TIMESTAMP.
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10.3 461de7edeae |
MariaDB [test]> select *, row_start, row_end from t1 for system_time as of current_timestamp;
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+------+----------------------------+----------------------------+
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| i | row_start | row_end |
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+------+----------------------------+----------------------------+
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| 222 | 2018-10-28 03:00:38.955943 | 2038-01-19 05:14:07.999999 |
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+------+----------------------------+----------------------------+
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1 row in set (0.00 sec)
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MariaDB [test]> select *, row_start, row_end from t1;
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+------+----------------------------+----------------------------+
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| i | row_start | row_end |
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+------+----------------------------+----------------------------+
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| 1 | 2018-10-28 03:59:09.810778 | 2038-01-19 05:14:07.999999 |
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| 222 | 2018-10-28 03:00:38.955943 | 2038-01-19 05:14:07.999999 |
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| 4 | 2018-10-28 03:59:09.810778 | 2038-01-19 05:14:07.999999 |
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+------+----------------------------+----------------------------+
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3 rows in set (0.00 sec)
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MariaDB [test]> select @@system_versioning_asof;
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+--------------------------+
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| @@system_versioning_asof |
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+--------------------------+
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| DEFAULT |
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+--------------------------+
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1 row in set (0.00 sec)
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Here is the whole data:
MariaDB [test]> select *, row_start, row_end from t1 for system_time all;
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+------+----------------------------+----------------------------+
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| i | row_start | row_end |
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+------+----------------------------+----------------------------+
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| 1 | 2018-10-28 03:59:09.810778 | 2038-01-19 05:14:07.999999 |
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| 222 | 2018-10-28 03:00:38.955943 | 2038-01-19 05:14:07.999999 |
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| 3 | 2018-10-28 03:59:09.810778 | 2018-10-28 03:59:15.529043 |
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| 4 | 2018-10-28 03:59:09.810778 | 2038-01-19 05:14:07.999999 |
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| 2 | 2018-10-28 03:59:09.810778 | 2018-10-28 03:59:26.361535 |
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| 22 | 2018-10-28 03:59:26.361535 | 2018-10-28 03:00:38.955943 |
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+------+----------------------------+----------------------------+
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6 rows in set (0.00 sec)
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Timestamps 03:59:xx signify events which happened before the switch, and 03:00:xx are those that happened after the switch.
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Issue Links
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