When using Unique Keys with nullable parts in RBR, the slave can
choose the wrong row to update. This happens because a table with
an unique key containing nullable parts cannot strictly guarantee
uniqueness. As stated in the manual, for all engines, a UNIQUE
index allows multiple NULL values for columns that can contain
NULL.
We fix this at the slave by extending the checks before assuming
that the row found through an unique index is is the correct
one. This means that when a record (R) is fetched from the storage
engine and a key that is not primary (K) is used, the server does
the following:
- If K is unique and has no nullable parts, it returns R;
- Otherwise, if any field in the before image that is part of K
is null do an index scan;
- If there is no NULL field in the BI part of K, then return R.
A side change: renamed the existing test case file and added a
test case covering the changes in this patch.
Problems:
- regression (compating to version 5.1) in metadata for BLOB types
- inconsistency between length metadata in server and embedded for BLOB types
- wrong max_length calculation in items derived from BLOB columns
@ libmysqld/lib_sql.cc
Calculating length metadata in embedded similary to server version,
using new function char_to_byte_length_safe().
@ mysql-test/r/ctype_utf16.result
Adding tests
@ mysql-test/r/ctype_utf32.result
Adding tests
@ mysql-test/r/ctype_utf8.result
Adding tests
@ mysql-test/r/ctype_utf8mb4.result
Adding tests
@ mysql-test/t/ctype_utf16.test
Adding tests
@ mysql-test/t/ctype_utf32.test
Adding tests
@ mysql-test/t/ctype_utf8.test
Adding tests
@ mysql-test/t/ctype_utf8mb4.test
Adding tests
@ sql/field.cc
Overriding char_length() for Field_blob:
unlike in generic Item::char_length() we don't
divide to mbmaxlen for BLOBs.
@ sql/field.h
- Making Field::char_length() virtual
- Adding prototype for Field_blob::char_length()
@ sql/item.h
- Adding new helper function char_to_byte_length_safe()
- Using new function
@ sql/protocol.cc
Using new function char_to_byte_length_safe().
modified:
libmysqld/lib_sql.cc
mysql-test/r/ctype_utf16.result
mysql-test/r/ctype_utf32.result
mysql-test/r/ctype_utf8.result
mysql-test/r/ctype_utf8mb4.result
mysql-test/t/ctype_utf16.test
mysql-test/t/ctype_utf32.test
mysql-test/t/ctype_utf8.test
mysql-test/t/ctype_utf8mb4.test
sql/field.cc
sql/field.h
sql/item.h
sql/protocol.cc
innodb.innodb [ fail ]
Test ended at 2010-06-02 15:04:06
CURRENT_TEST: innodb.innodb
--- /usr/w/mysql-trunk-innodb/mysql-test/suite/innodb/r/innodb.result 2010-05-23 23:10:26.576407000 +0300
+++ /usr/w/mysql-trunk-innodb/mysql-test/suite/innodb/r/innodb.reject 2010-06-02 15:04:05.000000000 +0300
@@ -2648,7 +2648,7 @@
create table t4 (s1 char(2) binary,primary key (s1)) engine=innodb;
insert into t1 values (0x41),(0x4120),(0x4100);
insert into t2 values (0x41),(0x4120),(0x4100);
-ERROR 23000: Duplicate entry 'A\x00' for key 'PRIMARY'
+ERROR 23000: Duplicate entry 'A' for key 'PRIMARY'
insert into t2 values (0x41),(0x4120);
The change in the printout was introduced in:
------------------------------------------------------------
revno: 3008.6.2
revision-id: sergey.glukhov@sun.com-20100527160143-57nas8nplzpj26dz
parent: sergey.glukhov@sun.com-20100527155443-24vqi9o8rpnkyci7
committer: Sergey Glukhov <Sergey.Glukhov@sun.com>
branch nick: mysql-trunk-bugfixing
timestamp: Thu 2010-05-27 20:01:43 +0400
message:
Bug#52430 Incorrect key in the error message for duplicate key error involving BINARY type
For BINARY(N) strip trailing zeroes to make the error message nice-looking
@ mysql-test/r/errors.result
test case
@ mysql-test/r/type_binary.result
result fix
@ mysql-test/t/errors.test
test case
@ sql/key.cc
For BINARY(N) strip trailing zeroes to make the error message nice-looking
and its author (Sergey) did not notice the test failure because that test
has been disabled in his tree.
------------------------------------------------------------
revno: 3495
committer: Marko Mäkelä <marko.makela@oracle.com>
branch nick: 5.1-innodb
timestamp: Wed 2010-06-02 13:37:14 +0300
message:
Bug#53674: InnoDB: Error: unlock row could not find a 4 mode lock on the record
In semi-consistent read, only unlock freshly locked non-matching records.
lock_rec_lock_fast(): Return LOCK_REC_SUCCESS,
LOCK_REC_SUCCESS_CREATED, or LOCK_REC_FAIL instead of TRUE/FALSE.
enum db_err: Add DB_SUCCESS_LOCKED_REC for indicating a successful
operation where a record lock was created.
lock_sec_rec_read_check_and_lock(),
lock_clust_rec_read_check_and_lock(), lock_rec_enqueue_waiting(),
lock_rec_lock_slow(), lock_rec_lock(), row_ins_set_shared_rec_lock(),
row_ins_set_exclusive_rec_lock(), sel_set_rec_lock(),
row_sel_get_clust_rec_for_mysql(): Return DB_SUCCESS_LOCKED_REC if a
new record lock was created. Adjust callers.
row_unlock_for_mysql(): Correct the function documentation.
row_prebuilt_t::new_rec_locks: Correct the documentation.
MTR will ignore fully qualified test name entries in disabled.def
lists. Therefore, it would still run the test case, even if it is
listed.
This patch fix this by extending the check when marking the test
case as disabled to take into consideration not only the cases that
contain the simple test name but also those that contain fully
qualified test names.
errors
In the fix of BUG#39934 in 5.1-rep+3, errors are generated when
binlog_format=row and a statement modifies a table restricted to
statement-logging (ER_BINLOG_ROW_MODE_AND_STMT_ENGINE); or if
binlog_format=statement and a statement modifies a table restricted to
row-logging (ER_BINLOG_STMT_MODE_AND_ROW_ENGINE).
However, some DDL statements that lock tables (e.g. ALTER TABLE,
CREATE INDEX and CREATE TRIGGER) were causing spurious errors,
although no row might be inserted into the binary log.
To fix the problem, we tagged statements that may generate
rows into the binary log and thence the warning messages are
only printed out when the appropriate conditions hold and rows
might be changed.
breaks
When a "CREATE TEMPORARY TABLE SELECT * FROM" was executed the OPTION_KEEP_LOG was
not set into the thd->variables.option_bits. For that reason, if the transaction
had updated only transactional engines and was rolled back at the end (.e.g due to
a deadlock) the changes were not written to the binary log, including the creation
of the temporary table.
To fix the problem, we have set the OPTION_KEEP_LOG into the
thd->variables.option_bits when a "CREATE TEMPORARY TABLE
SELECT * FROM" is executed.
- revid:sp1r-svoj@mysql.com/june.mysql.com-20080324111246-00461
- revid:sp1r-svoj@mysql.com/june.mysql.com-20080414125521-40866
BUG#35274 - merge table doesn't need any base tables, gives
error 124 when key accessed
SELECT queries that use index against a merge table with empty
underlying tables list may return with error "Got error 124 from
storage engine".
The problem was that wrong error being returned.
when it should use index
Sometimes the LEFT/RIGHT JOIN with an empty table caused an
unnecessary filesort.
Sample query, where t1.i1 is indexed and t3 is empty:
SELECT t1.*, t2.* FROM t1 JOIN t2 ON t1.i1 = t2.i2
LEFT JOIN t3 ON t2.i2 = t3.i3
ORDER BY t1.i1 LIMIT 5;
The server erroneously used an item of empty outer-joined
table as a common constant of a Item_equal (multi-equivalence
expression).
By the fix for the bug 16590 the constant status of such
an item has been propagated to st_table::const_key_parts
map bits related to other Item_equal argument-related
key parts (those are obviously not constant in our case).
As far as test_if_skip_sort_order function skips constant
prefixes of testing keys, this caused an ignorance of
available indices, since some prefixes were marked as
constant by mistake.
and .tar.gz, windows vs linux..
On Intel x86 machines index selection by the MySQL query
optimizer could sometimes depend on the compiler version and
optimization flags used to build the server binary.
The problem was a result of a known issue with floating point
calculations on x86: since internal FPU precision (80 bit)
differs from precision used by programs (32-bit float or 64-bit
double), the result of calculating a complex expression may
depend on how FPU registers are allocated by the compiler and
whether intermediate values are spilled from FPU to memory. In
this particular case compiler versions and optimization flags
had an effect on cost calculation when choosing the best index
in best_access_path().
A possible solution to this problem which has already been
implemented in mysql-trunk is to limit FPU internal precision
to 64 bits. So the fix is a backport of the relevant code to
5.1 from mysql-trunk.
The problem is that if a NULL is stored in an Item_cache_decimal object,
the associated my_decimal object is not initialized. However, it is still
accessed when val_int() is called. The fix is to check for null_value
within val_int(), and return without accessing the my_decimal object when
the cached value is NULL.
Bug#52122 reports the same issue for val_real(), and this patch also includes
fixes for val_real() and val_str() and corresponding test cases from that
bug report.
Also, NULL is returned from val_decimal() when value is null. This will
avoid that callers access an uninitialized my_decimal object.
Made similar changes to all other Item_cache classes. Now all val_*
methods should return a well defined value when actual value is NULL.
