UNION could convert fixed-point FLOAT(M,D)/DOUBLE(M,D) columns
to FLOAT/DOUBLE when aggregating data types from the SELECT
substatements. While there is nothing particularly wrong with
this behavior, especially when M is greater than the hardware
precision limits, it could be confusing in cases when all
SELECT statements in a union have the same
FLOAT(M,D)/DOUBLE(M,D) columns with equal precision
specifications listed in the same position.
Since the manual is quite vague on what data type should be
returned in such cases, the bug was fixed by implementing the
most 'expected' behavior: do not convert FLOAT(M,D)/DOUBLE(M,D)
to anything else if all SELECT statements in a UNION have the
same precision for that column.
mysql-test/r/union.result:
Added a test case for bug #43432.
mysql-test/t/union.test:
Added a test case for bug #43432.
sql/field.cc:
Replaced FLT_DIG+6 and DBL_DIG+7 with a symbolic constant.
sql/item.cc:
Do not convert FLOAT(M,D)/DOUBLE(M,D)
to anything else if all SELECT statements in a UNION have the
same precision for that column.
sql/mysql_priv.h:
Added a symbolic constant for FLT_DIG+6 and DBL_DIG+7.
UNION could convert fixed-point FLOAT(M,D)/DOUBLE(M,D) columns
to FLOAT/DOUBLE when aggregating data types from the SELECT
substatements. While there is nothing particularly wrong with
this behavior, especially when M is greater than the hardware
precision limits, it could be confusing in cases when all
SELECT statements in a union have the same
FLOAT(M,D)/DOUBLE(M,D) columns with equal precision
specifications listed in the same position.
Since the manual is quite vague on what data type should be
returned in such cases, the bug was fixed by implementing the
most 'expected' behavior: do not convert FLOAT(M,D)/DOUBLE(M,D)
to anything else if all SELECT statements in a UNION have the
same precision for that column.
set but is ignored".
This patch makes @@session.max_allowed_packed and
@@session.net_buffer_length read-only as suggested in the bug
report. The user will have to use SET GLOBAL (and reconnect)
to alter the session values of these variables.
The error string ER_VARIABLE_IS_READONLY is introduced.
Tests are modified accordingly.
sql/set_var.cc:
The class sys_var_thd_ulong_session_readonly is introduced as
a specialization of sys_var_thd_ulong implementing a read-only
session variable. The class overrides check() and
check_default() to achieve the read-only property for the
session part of the variable.
sql/set_var.h:
The class sys_var_thd_ulong_session_readonly is introduced as
a specialization of sys_var_thd_ulong implementing a read-only
session variable. The class overrides check() and
check_default() to achieve the read-only property for the
session part of the variable.
sql/share/errmsg.txt:
New error ER_VARIABLE_IS_READONLY.
set but is ignored".
This patch makes @@session.max_allowed_packed and
@@session.net_buffer_length read-only as suggested in the bug
report. The user will have to use SET GLOBAL (and reconnect)
to alter the session values of these variables.
The error string ER_VARIABLE_IS_READONLY is introduced.
Tests are modified accordingly.
subselects into account
It is forbidden to use the SELECT INTO construction inside UNION statements
unless on the last SELECT of the union. The parser records whether it
has seen INTO or not when parsing a UNION statement. But if the INTO was
legally used in an outer query, an error is thrown if UNION is seen in a
subquery. Fixed in 5.0 by remembering the nesting level of INTO tokens and
mitigate the error unless it collides with the UNION.
mysql-test/r/union.result:
Bug#32858: Test result
mysql-test/t/union.test:
Bug#32858: Test case
sql/sql_class.cc:
Bug#32858: Initializing new member
sql/sql_class.h:
Bug#32858: Added property nest_level to select_result class.
sql/sql_yacc.yy:
Bug#32858: The fix.
subselects into account
It is forbidden to use the SELECT INTO construction inside UNION statements
unless on the last SELECT of the union. The parser records whether it
has seen INTO or not when parsing a UNION statement. But if the INTO was
legally used in an outer query, an error is thrown if UNION is seen in a
subquery. Fixed in 5.0 by remembering the nesting level of INTO tokens and
mitigate the error unless it collides with the UNION.
into linux-st28.site:/home/martin/mysql/src/bug32848/my51-bug32848
sql/field.cc:
Auto merged
sql/field.h:
Auto merged
sql/item.cc:
Auto merged
sql/sql_select.cc:
Auto merged
mysql-test/r/union.result:
Bug#32848: Manual merge
mysql-test/t/union.test:
Bug#32848: Manual merge
into linux-st28.site:/home/martin/mysql/src/bug32848/my51-bug32848-gca
mysql-test/r/union.result:
Auto merged
mysql-test/t/union.test:
Auto merged
sql/field.h:
Auto merged
sql/sql_select.cc:
Auto merged
sql/field.cc:
Bug#32848: Manual merge
sql/item.cc:
Bug#32848: Manual merge
into linux-st28.site:/home/martin/mysql/src/bug32848/my50-bug32848
sql/field.cc:
Auto merged
sql/field.h:
Auto merged
sql/item.cc:
Auto merged
sql/sql_select.cc:
Auto merged
mysql-test/r/union.result:
Bug#32848: Manual merge
mysql-test/t/union.test:
Bug#32848: Manual merge
into magare.gmz:/home/kgeorge/mysql/work/B19390-5.1-opt
client/mysql.cc:
Auto merged
client/mysqltest.c:
Auto merged
mysql-test/r/func_gconcat.result:
Auto merged
mysql-test/suite/rpl/r/rpl_trigger.result:
Auto merged
mysql-test/suite/rpl/t/rpl_trigger.test:
Auto merged
mysql-test/t/func_gconcat.test:
Auto merged
sql/item_sum.cc:
Auto merged
sql/item_timefunc.cc:
Auto merged
sql/log.cc:
Auto merged
sql/set_var.cc:
Auto merged
sql/sp.cc:
Auto merged
sql/sql_class.cc:
Auto merged
sql/sql_class.h:
Auto merged
sql/unireg.cc:
Auto merged
mysql-test/r/union.result:
Merged bug 27848 to 5.1-opt
mysql-test/t/union.test:
Merged bug 27848 to 5.1-opt
sql/sql_yacc.yy:
Merged bug 27848 to 5.1-opt
into linux-st28.site:/home/martin/mysql/src/bug32858/my50-bug32858-push
sql/sql_class.cc:
Auto merged
sql/sql_class.h:
Auto merged
sql/sql_yacc.yy:
Auto merged
mysql-test/r/union.result:
Bug#32858: Manual merge
mysql-test/t/union.test:
Bug#32858: Manual merge
In a union without braces, the order by at the end is applied to the
overall union. It therefore should not interfere with the individual
select parts of the union.
Fixed by changing our parser rules appropriately.
mysql-test/r/union.result:
Added a test case for bug #27848.
mysql-test/t/union.test:
Added a test case for bug #27848.
In a union without braces, the order by at the end is applied to the
overall union. It therefore should not interfere with the individual
select parts of the union.
Fixed by changing our parser rules appropriately.
subselects into account
It is forbidden to use the SELECT INTO construction inside UNION statements
unless on the last SELECT of the union. The parser records whether it
has seen INTO or not when parsing a UNION statement. But if the INTO was
legally used in an outer query, an error is thrown if UNION is seen in a
subquery. Fixed in 5.0 by remembering the nesting level of INTO tokens and
mitigate the error unless it collides with the UNION.
mysql-test/r/union.result:
Bug#32858: Test result
mysql-test/t/union.test:
Bug#32858: Test case
sql/sql_class.cc:
Bug#32858: Initializing new member
sql/sql_class.h:
Bug#32858: Added property nest_level to select_result class.
sql/sql_yacc.yy:
Bug#32858: The fix.
subselects into account
It is forbidden to use the SELECT INTO construction inside UNION statements
unless on the last SELECT of the union. The parser records whether it
has seen INTO or not when parsing a UNION statement. But if the INTO was
legally used in an outer query, an error is thrown if UNION is seen in a
subquery. Fixed in 5.0 by remembering the nesting level of INTO tokens and
mitigate the error unless it collides with the UNION.
There were two problems when inferring the correct field types resulting from
UNION queries.
- If the type is NULL for all corresponding fields in the UNION, the resulting
type would be NULL, while the type is BINARY(0) if there is just a single
SELECT NULL.
- If one SELECT in the UNION uses a subselect, a temporary table is created
to represent the subselect, and the result type defaults to a STRING type,
hiding the fact that the type was unknown(just a NULL value).
Fixed by remembering whenever a field was created from a NULL value and pass
type NULL to the type coercion if that is the case, and creating a string field
as result of UNION only if the type would otherwise be NULL.
mysql-test/r/union.result:
Bug#32848: Test result
mysql-test/t/union.test:
Bug#32848: Test case
sql/field.cc:
Bug#32848: Initialization of new field
sql/field.h:
Bug#32848: New member to record when a field was created from a NULL value.
sql/item.cc:
Bug#32848:
A field created from a NULL value will submit NULL as type to the
type coercion procedure.
If Item_type_holder has not inferred the correct type after processing all
SELECTs in a UNION, a string field is created.
sql/sql_select.cc:
Bug#32848: Recording when a field is created from a NULL value.
There were two problems when inferring the correct field types resulting from
UNION queries.
- If the type is NULL for all corresponding fields in the UNION, the resulting
type would be NULL, while the type is BINARY(0) if there is just a single
SELECT NULL.
- If one SELECT in the UNION uses a subselect, a temporary table is created
to represent the subselect, and the result type defaults to a STRING type,
hiding the fact that the type was unknown(just a NULL value).
Fixed by remembering whenever a field was created from a NULL value and pass
type NULL to the type coercion if that is the case, and creating a string field
as result of UNION only if the type would otherwise be NULL.
into mysql.com:/home/hf/work/mrg/mysql-5.1-opt
mysql-test/r/subselect3.result:
Auto merged
mysql-test/r/union.result:
Auto merged
mysql-test/t/union.test:
Auto merged
sql/item.h:
Auto merged
sql/item_sum.cc:
Auto merged
sql/item_sum.h:
Auto merged
sql/opt_range.cc:
Auto merged
sql/sql_insert.cc:
Auto merged
sql/sql_yacc.yy:
Auto merged
mysql-test/r/subselect.result:
merging
mysql-test/t/subselect.test:
merging
sql/sql_base.cc:
mergin
sql/sql_class.h:
merging
sql/sql_select.cc:
merging
INTO clause can be specified only for the last select of a UNION and it
receives the result of the whole query. But it was wrongly allowed in
non-last selects of a UNION which leads to a confusing query result.
Now INTO allowed only in the last select of a UNION.
mysql-test/t/union.test:
Added a test case for the bug#23345: Wrongly allowed INTO in a non-last select of a UNION.
mysql-test/r/union.result:
Added a test case for the bug#23345: Wrongly allowed INTO in a non-last select of a UNION.
sql/sql_yacc.yy:
Bug#23345: Wrongly allowed INTO in a non-last select of a UNION.
Now INTO allowed only in the last select of a UNION.
INTO clause can be specified only for the last select of a UNION and it
receives the result of the whole query. But it was wrongly allowed in
non-last selects of a UNION which leads to a confusing query result.
Now INTO allowed only in the last select of a UNION.
construct references invalid name.
Derived tables currently cannot use outer references.
Thus there is no outer context for them.
The 4.1 code takes this fact into account while the
Item_field::fix_outer_field code of 5.0 lost the check that blocks
any attempts to resolve names in outer context for derived tables.
mysql-test/r/union.result:
Added a test case for bug #26661.
mysql-test/t/union.test:
Added a test case for bug #26661.
sql/item.cc:
Fixed bug #26661.
Derived tables currently cannot use outer references.
Thus there is no outer context for them.
The 4.1 code takes this fact into account while the
Item_field::fix_outer_field code of 5.0 lost the check that blocks
any attempts to resolve names in outer context for derived tables.
construct references invalid name.
Derived tables currently cannot use outer references.
Thus there is no outer context for them.
The 4.1 code takes this fact into account while the
Item_field::fix_outer_field code of 5.0 lost the check that blocks
any attempts to resolve names in outer context for derived tables.
A better fix for bug#10025.
Fixed test case plus added new tests.
After fixing Bug#20208 "Blobs greater than 8K are being truncated to 8K"
the fix to bug#10025 "Misleading error with COLLATE mediumtext and UNION"
became more accurate. Earlier mediumtext got converted to longtext,
although mediumtext was enough to contain the results. Now it converts
correctly to mediumtext, if the length does not exceed that and if none
of the original fields were type longtext.
Type longtext still converts correctly to type longtext, as the extra
tests prove.
mysql-test/r/union.result:
Fixed an earlier test case plus added two new tests.
mysql-test/t/union.test:
Fixed an earlier test case plus added two new tests.
A better fix for bug#10025.
Fixed test case plus added new tests.
After fixing Bug#20208 "Blobs greater than 8K are being truncated to 8K"
the fix to bug#10025 "Misleading error with COLLATE mediumtext and UNION"
became more accurate. Earlier mediumtext got converted to longtext,
although mediumtext was enough to contain the results. Now it converts
correctly to mediumtext, if the length does not exceed that and if none
of the original fields were type longtext.
Type longtext still converts correctly to type longtext, as the extra
tests prove.
into neptunus.(none):/home/msvensson/mysql/mysql-5.0-maint
client/mysql.cc:
Auto merged
client/mysqltest.c:
Auto merged
mysql-test/mysql-test-run.pl:
Auto merged
mysql-test/r/date_formats.result:
Auto merged
mysql-test/r/union.result:
Auto merged
mysql-test/t/union.test:
Auto merged
sql/field.cc:
Auto merged
sql/item.cc:
Auto merged
sql/item_func.cc:
Auto merged
sql/item_func.h:
Auto merged
sql/item_strfunc.cc:
Auto merged
sql/item_strfunc.h:
Auto merged
sql/item_subselect.cc:
Auto merged
sql/item_sum.cc:
Auto merged
sql/sql_yacc.yy:
Auto merged
mysql-test/r/func_group.result:
Merge manually
mysql-test/t/func_group.test:
Merge manually
into moonbone.local:/work/autopush/12185-bug-5.0-opt-mysql
mysql-test/r/create.result:
Auto merged
mysql-test/t/innodb.test:
Auto merged
sql/field.cc:
Auto merged
sql/field.h:
Auto merged
sql/item.cc:
Auto merged
mysql-test/r/union.result:
SCCS merged
mysql-test/t/union.test:
SCCS merged
The Item::tmp_table_field_from_field_type() function creates Field_datetime
object instead of Field_timestamp object for timestamp field thus always
changing data type is a tmp table is used.
The Field_blob object constructor which is used in the
Item::tmp_table_field_from_field_type() is always setting packlength field of
newly created blob to 4. This leads to changing fields data type for example
from the blob to the longblob if a temporary table is used.
The Item::make_string_field() function always converts Field_string objects
to Field_varstring objects. This leads to changing data type from the
char/binary to varchar/varbinary.
Added appropriate Field_timestamp object constructor for using in the
Item::tmp_table_field_from_field_type() function.
Added Field_blob object constructor which sets pack length according to
max_length argument.
The Item::tmp_table_field_from_field_type() function now creates
Field_timestamp object for a timestamp field.
The Item_type_holder::display_length() now returns correct NULL length NULL
length.
The Item::make_string_field() function now doesn't change Field_string to
Field_varstring in the case of Item_type_holder.
The Item::tmp_table_field_from_field_type() function now uses the Field_blob
constructor which sets packlength according to max_length.
mysql-test/t/union.test:
Added test case for bug#12185: Data type aggregation may produce wrong result
Corrected test case after fix for bug#12185
mysql-test/t/innodb.test:
Corrected test case after fix for bug#12185
mysql-test/r/union.result:
Added test case for bug#12185: Data type aggregation may produce wrong result
Corrected test case after fix for bug#12185
mysql-test/r/innodb.result:
Corrected test case after fix for bug#12185
mysql-test/r/create.result:
Corrected the test case after fixing bug#12185
sql/field.h:
Fixed bug#12185: Data type aggregation may produce wrong result
Added Field_blob object constructor which sets packlength according to
max_length argument.
sql/item.cc:
Fixed bug#12185: Data type aggregation may produce wrong result
The Item::make_string_field() function now doesn't change Field_string to
Field_varstring in the case of Item_type_holder.
The Item::tmp_table_field_from_field_type() function now creates
Field_timestamp object for a timestamp field.
The Item::tmp_table_field_from_field_type() function now uses the Field_blob
constructor which sets packlength according to max_length.
The Item_type_holder::display_length() now returns correct NULL length NULL
length.
sql/field.cc:
Fixed bug#12185: Data type aggregation may produce wrong result
Added appropriate Field_timestamp object constructor for using in the
Item::tmp_table_field_from_field_type() function.
The Item::tmp_table_field_from_field_type() function creates Field_datetime
object instead of Field_timestamp object for timestamp field thus always
changing data type is a tmp table is used.
The Field_blob object constructor which is used in the
Item::tmp_table_field_from_field_type() is always setting packlength field of
newly created blob to 4. This leads to changing fields data type for example
from the blob to the longblob if a temporary table is used.
The Item::make_string_field() function always converts Field_string objects
to Field_varstring objects. This leads to changing data type from the
char/binary to varchar/varbinary.
Added appropriate Field_timestamp object constructor for using in the
Item::tmp_table_field_from_field_type() function.
Added Field_blob object constructor which sets pack length according to
max_length argument.
The Item::tmp_table_field_from_field_type() function now creates
Field_timestamp object for a timestamp field.
The Item_type_holder::display_length() now returns correct NULL length NULL
length.
The Item::make_string_field() function now doesn't change Field_string to
Field_varstring in the case of Item_type_holder.
The Item::tmp_table_field_from_field_type() function now uses the Field_blob
constructor which sets packlength according to max_length.
This was only demonstrated by the use of PASSWORD(), it was not related to
that function at all. The calculation of the size of a field in the results
of a UNION did not take into account the possible growth of a string field
when being converted to the aggregated character set.
mysql-test/r/union.result:
Add new results
mysql-test/t/union.test:
Add new regression test
sql/item.cc:
Fix calculation of max_length when figuring out the type of a column in
a UNION. It needs to take into account any expansion of field size due to
charset conversions.
This was only demonstrated by the use of PASSWORD(), it was not related to
that function at all. The calculation of the size of a field in the results
of a UNION did not take into account the possible growth of a string field
when being converted to the aggregated character set.
resulted in a wrong error message.
The nest_level counter indicates the depth of nesting for a subselect. It is
needed to properly resolve aggregate functions in nested subselects. Obviously
it shouldn't be incremented for UNION parts because they have the same level of
nesting. This counter was incremented by 1 in the mysql_new_select() function
for any new select and wasn't decremented for UNION parts. This resulted in
wrongly reported error messages.
Now the nest_level counter is decremented by 1 for any union part.
mysql-test/t/union.test:
Added test case for the bug#18175: The nest_level counter wasn't decremented for union parts which
resulted in a wrong error message.
mysql-test/r/union.result:
Added test case for the bug#18175: The nest_level counter wasn't decremented for union parts which
resulted in a wrong error message.
sql/sql_yacc.yy:
Fixed bug#18175: The nest_level counter wasn't decremented for union parts which
resulted in a wrong error message.
Now the nest_level counter is decremented by 1 for any union part.
resulted in a wrong error message.
The nest_level counter indicates the depth of nesting for a subselect. It is
needed to properly resolve aggregate functions in nested subselects. Obviously
it shouldn't be incremented for UNION parts because they have the same level of
nesting. This counter was incremented by 1 in the mysql_new_select() function
for any new select and wasn't decremented for UNION parts. This resulted in
wrongly reported error messages.
Now the nest_level counter is decremented by 1 for any union part.
