Problem:
mysqld --collation-server=xxx --character-set-server=yyy
didn't work as expected: collation_server was set not to xxx,
but to the default collation of character set "yyy".
With different argument order it worked as expected:
mysqld --character-set-server=yyy --collation-server=yyy
Fix:
initializate default_collation_name to 0
when processing --character-set-server
only if --collation-server has not been specified
in command line.
The problem was a call to convert_dirname() with a destination buffer
that did not have room for the trailing slash added by that function.
This could cause the instance manager to crash in some cases.
An UNIQUE KEY consisting of NOT NULL columns
was displayed as PRIMARY KEY in "DESC t1".
According to the code, that was intentional
behaviour for some reasons unknown to me.
This code was written before bitkeeper time,
so I cannot check who and why made this.
After discussing on dev-public, a decision
was made to remove this code
mysqldump.test calls my_print_defaults in a way that includes the systemwide
my.cnf, so the results will be beyond our control and depend on whatever the
user has in their my.cnf, namely the [mysqldump] section.
call my_print_defaults with --config-file rather than --defaults-extra-file
to prevent inclusion of system-wide defaults and use our config-file only.
- The setting of "ENV{'TZ'}" doesn't affect the timezone
used by MySQL Server on Windows.
- Explicitly set timezone in test cases before doing UTC/localtime
conversions so tests produce deterministic results
- The setting of "ENV{'TZ'}" doesn't affect the timezone
used by MySQL Server on Windows.
- Explicitly set timezone to "+03:00" in test case before
doing the calculatiosn to check that there is three hours
difference between utc and local time.
(Magnus' fix)
The AsBinary function returns VARCHAR data type with binary collation.
It can cause problem for clients that treat that kind of data as
different from BLOB type.
So now AsBinary returns BLOB.
with PREPARE fails with weird error".
More generally, re-executing a stored procedure with a complex SP cursor query
could lead to a crash.
The cause of the problem was that SP cursor queries were not optimized
properly at first execution: their parse tree belongs to sp_instr_cpush,
not sp_instr_copen, and thus the tree was tagged "EXECUTED" when the
cursor was declared, not when it was opened. This led to loss of optimization
transformations performed at first execution, as sp_instr_copen saw that the
query is already "EXECUTED" and therefore either not ran first-execution
related blocks or wrongly rolled back the transformations caused by
first-execution code.
The fix is to update the state of the parsed tree only when the tree is
executed, as opposed to when the instruction containing the tree is executed.
Assignment if i->state is moved to reset_lex_and_exec_core.
The problem was in redundant calls to strlen() in string functions,
where we may then return after checking only the small number of characters.
No test case is provided since it's a performance fix.
This bug in Field_string::cmp resulted in a wrong comparison
with keys in partial indexes over multi-byte character fields.
Given field a is declared as a varchar(16) collate utf8_unicode_ci
INDEX(a(4)) gives us an example of such an index.
Wrong key comparisons could lead to wrong result sets if
the selected query execution plan used a range scan by
a partial index over a utf8 character field.
This also caused wrong results in many other cases.
