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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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18
sql/sql_string.cc
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@ -502,6 +502,24 @@ bool String::append(IO_CACHE* file, uint32 arg_length)
return FALSE;
}
/**
Append a parenthesized number to String.
Used in various pieces of SHOW related code.
@param nr Number
@param radix Radix, optional parameter, 10 by default.
*/
bool String::append_parenthesized(long nr, int radix)
{
char buff[64], *end;
buff[0]= '(';
end= int10_to_str(nr, buff + 1, radix);
*end++ = ')';
return append(buff, (uint) (end - buff));
}
bool String::append_with_prefill(const char *s,uint32 arg_length,
uint32 full_length, char fill_char)
{