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MDEV-29646: sformat('Num [{:20}]', 42) gives incorrect result in view

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The problem is that sformat does not assign the enough space for the
result string. The result string is allocated with the max_length of
argument, but the correst max_length should be based on the format
string.

The patch fixes the problem by using MAX_BLOB_WIDTH to assign length
This commit is contained in:
Weijun Huang 2023-03-31 01:18:24 +02:00 • committed by Daniel Black
parent 7d967423fe
commit f288d42cdb
3 changed files with 46 additions and 2 deletions
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25
mysql-test/main/func_sformat.result
View file

@ -434,7 +434,7 @@ create table t1 as select sformat(_ucs2 x'003D007B007D003D', _ucs2 x'04420435044
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`x` varchar(8) CHARACTER SET ucs2 COLLATE ucs2_general_ci DEFAULT NULL
`x` longtext CHARACTER SET ucs2 COLLATE ucs2_general_ci DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
set names latin1;
@ -468,3 +468,26 @@ set names latin1;
#
# End of 10.7 tests
#
#
# Start of 10.8 tests
#
#
# MDEV-29646 sformat('Num [{:20}]', 42) gives incorrect result in view
#
create view v1 as select sformat('Num [{:20}]', 42);
select * from v1;
sformat('Num [{:20}]', 42)
Num [ 42]
drop view v1;
create view v1 as SELECT sformat('Square root of [{:d}] is [{:.20}]', 2, sqrt(2));
select * from v1;
sformat('Square root of [{:d}] is [{:.20}]', 2, sqrt(2))
Square root of [2] is [1.4142135623730951455]
drop view v1;
create table t1 (a text, b int, c text);
insert t1 values ('[{} -> {}]', 10, '{}'), ('[{:20} <- {}]', 1, '{:30}');
select sformat(a,b,c) from t1;
sformat(a,b,c)
[10 -> {}]
[ 1 <- {:30}]
drop table t1;

21
mysql-test/main/func_sformat.test
View file

@ -253,3 +253,24 @@ set names latin1;
echo #;
echo # End of 10.7 tests;
echo #;
echo #;
echo # Start of 10.8 tests;
echo #;
echo #;
echo # MDEV-29646 sformat('Num [{:20}]', 42) gives incorrect result in view;
echo #;
create view v1 as select sformat('Num [{:20}]', 42);
select * from v1;
drop view v1;
create view v1 as SELECT sformat('Square root of [{:d}] is [{:.20}]', 2, sqrt(2));
select * from v1;
drop view v1;
create table t1 (a text, b int, c text);
insert t1 values ('[{} -> {}]', 10, '{}'), ('[{:20} <- {}]', 1, '{:30}');
select sformat(a,b,c) from t1;
drop table t1;

2
sql/item_strfunc.cc
View file

@ -1348,13 +1348,13 @@ bool Item_func_sformat::fix_length_and_dec()
for (uint i=0 ; i < arg_count ; i++)
{
char_length+= args[i]->max_char_length();
if (args[i]->result_type() == STRING_RESULT &&
Type_std_attributes::agg_item_set_converter(c, func_name_cstring(),
args+i, 1, flags, 1))
return TRUE;
}
char_length= MAX_BLOB_WIDTH;
fix_char_length_ulonglong(char_length);
return FALSE;
}