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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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23
mysql-test/t/function_defaults.test Normal file
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--echo #
--echo # Test of function defaults for any server, including embedded.
--echo #
--source include/have_innodb.inc
--echo #
--echo # Function defaults run 1. No microsecond precision.
--echo #
let $current_timestamp=CURRENT_TIMESTAMP;
let $now=NOW();
let $timestamp=TIMESTAMP;
let $datetime=DATETIME;
source 'include/function_defaults.inc';
--echo #
--echo # Function defaults run 2. Six digits scale on seconds precision.
--echo #
let $current_timestamp=CURRENT_TIMESTAMP(6);
let $now=NOW(6);
let $timestamp=TIMESTAMP(6);
let $datetime=DATETIME(6);
source 'include/function_defaults.inc';