with previous rows.
The WHERE clause containing expression:
CONCAT(empty_field1, empty_field2, ..., 'literal constant', ...)
REGEXP 'regular expression'
may return wrong matches.
Optimization of the CONCAT function has been fixed.
mysql-test/r/func_concat.result:
Added test case for bug #36488.
mysql-test/t/func_concat.test:
Added test case for bug #36488.
sql/item_strfunc.cc:
Fixed bug #36488.
The Item_func_concat::val_str method is optimized to
use first non-empty argument of the CONCAT function for in-place
result accumulation. This optimization is acceptable if that
first argument is not a constant.
However, current implementation checks this condition only for
the first actual argument of the CONCAT function.
So, the Item_func_concat::val_str method can corrupt values
of, for example, literal strings by appending random data.
The Item_func_concat::val_str method has been modified to take
into account the ability to be modified in-place for the first
non-empty argument.
After merge fix
mysql-test/r/func_time.result:
After merge fix
mysql-test/r/func_concat.result:
After merge fix
mysql-test/r/cast.result:
After merge fix
sql/item_cmpfunc.h:
After merge fix
sql/item_cmpfunc.cc:
After merge fix
sql/field.cc:
After merge fix
mysql-test/r/cast.result:
Auto merged
mysql-test/t/func_time.test:
Auto merged
sql/item_cmpfunc.h:
Auto merged
sql/item_strfunc.cc:
Auto merged
sql/item_timefunc.cc:
Auto merged
sql/item_timefunc.h:
Auto merged
sql/opt_sum.cc:
Auto merged
sql/structs.h:
Auto merged
To calculate its max_length the CONCAT() function is simply sums max_lengths
of its arguments but when the collation of an argument differs from the
collation of the CONCAT() max_length will be wrong. This may lead to a data
truncation when a tmp table is used, in UNIONS for example.
The Item_func_concat::fix_length_and_dec() function now recalculates the
max_length of an argument when the mbmaxlen of the argument differs from the
mbmaxlen of the CONCAT().
mysql-test/t/func_concat.test:
Added test case for bug#15962:CONCAT() in UNION may lead to a data trucation.
mysql-test/r/func_concat.result:
Added test case for bug#15962:CONCAT() in UNION may lead to a data trucation.
sql/item_strfunc.cc:
Fixed bug#15962: CONCAT() in UNION may lead to a data trucation.
The Item_func_concat::fix_length_and_dec() function now recalculates the
max_length of an argument when the mbmaxlen of the argument differs from the
mbmaxlen of the CONCAT().
The Item_func_concat::val_str() function tries to make as less re-allocations
as possible. This results in appending strings returned by 2nd and next
arguments to the string returned by 1st argument if the buffer for the first
argument has enough free space. A constant subselect is evaluated only once
and its result is stored in an Item_cache_str. In the case when the first
argument of the concat() function is such a subselect Item_cache_str returns
the stored value and Item_func_concat::val_str() append values of other
arguments to it. But for the next row the value in the Item_cache_str isn't
restored because the subselect is a constant one and it isn't evaluated second
time. This results in appending string values of 2nd and next arguments to the
result of the previous Item_func_concat::val_str() call.
The Item_func_concat::val_str() function now checks whether the first argument
is a constant one and if so it doesn't append values of 2nd and next arguments
to the string value returned by it.
mysql-test/t/func_concat.test:
Added test case for bug#16716: subselect in concat() may lead to a wrong result.
mysql-test/r/func_concat.result:
Added test case for bug#16716: subselect in concat() may lead to a wrong result.
sql/item_strfunc.cc:
Fixed bug#16716: subselect in concat() may lead to a wrong result.
The Item_func_concat::val_str() function now checks whether the first argument
is a constant one and if so it doesn't append values of 2nd and next arguments
to the string value returned by it.
For numeric constants we only need to add, since the parser doesn't produce
negative numbers.
For strings we only add (we actually could substract 1 if given string is a constant
and it has '-number' form but we're not doing that because
* we set max_length bigger then necessary in other cases as well.
* the current solution is simpler and safer (bigger max_length is better then cutting out)
mysql-test/r/func_concat.result:
Test for BUG#6825
mysql-test/r/metadata.result:
Ajusted results according to fix of bug BUG#6825:length(-1) = 2 , not 1
mysql-test/t/func_concat.test:
Test for BUG#6825
Fixed bug in new code for regexp LIKE NULL
BUILD/SETUP.sh:
Fixes for gcc 3.1
BUILD/compile-solaris-sparc-debug:
Fixes for gcc 3.1
BUILD/compile-solaris-sparc-purify:
Fixes for gcc 3.1
BUILD/compile-solaris-sparc:
Fixes for gcc 3.1
Docs/manual.texi:
Fixed typo
include/violite.h:
Fixes for gcc 3.1
mysql-test/r/func_concat.result:
Updated test results
sql/item_cmpfunc.cc:
Fixed bug in new code for regexp LIKE NULL
Update of glibc patch from MySQL 4.0
Docs/glibc-2.2.5.patch:
Update of patch from MySQL 4.0
Docs/manual.texi:
ChangeLog
sql/item_strfunc.cc:
Fix bug in CONCAT_WS()
sql/share/italian/errmsg.txt:
Update of new error messages
