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MDEV-452 Add full support for auto-initialized/updated timestamp and datetime

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Generalized support for auto-updated and/or auto-initialized timestamp
and datetime columns. This patch is a reimplementation of MySQL's
"WL#5874: CURRENT_TIMESTAMP as DEFAULT for DATETIME columns". In order to
ease future merges, this implementation reused few function and variable
names from MySQL's patch, however the implementation is quite different.

TODO:
The only unresolved problem in this patch is the semantics of LOAD DATA for
TIMESTAMP and DATETIME columns in the cases when there are missing or NULL
columns. I couldn't fully comprehend the logic behind MySQL's behavior and
its relationship with their own documentation, so I left the results to be
more consistent with all other LOAD cases.

The problematic test cases can be seen by running the test file function_defaults,
and observing the test case differences. Those were left on purpose for discussion.
This commit is contained in:
unknown
2012-10-17 15:43:56 +03:00
parent 620d14f8c3
commit bc4a456758
61 changed files with 5375 additions and 540 deletions
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4
mysql-test/r/mysqldump.result
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@ -5239,7 +5239,7 @@ Error 1146 Table 'mysql.event' doesn't exist
SHOW CREATE TABLE mysql.general_log;
Table Create Table
general_log CREATE TABLE `general_log` (
`event_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`event_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
`user_host` mediumtext NOT NULL,
`thread_id` int(11) NOT NULL,
`server_id` int(10) unsigned NOT NULL,
@ -5249,7 +5249,7 @@ general_log CREATE TABLE `general_log` (
SHOW CREATE TABLE mysql.slow_log;
Table Create Table
slow_log CREATE TABLE `slow_log` (
`start_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`start_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
`user_host` mediumtext NOT NULL,
`query_time` time(6) NOT NULL,
`lock_time` time(6) NOT NULL,