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Fix Bug#13894 Server crashes on update of CSV table

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This commit is contained in:
petr@mysql.com
2005-11-05 15:08:15 +03:00
parent 085b48427d
commit a1f56ea5a6
3 changed files with 47 additions and 10 deletions
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20
mysql-test/r/csv.result
View File

@ -4929,3 +4929,23 @@ Warnings:
Note 1051 Unknown table 't2'
Note 1051 Unknown table 't3'
Note 1051 Unknown table 't4'
DROP TABLE IF EXISTS bug13894;
CREATE TABLE bug13894 ( val integer ) ENGINE = CSV;
INSERT INTO bug13894 VALUES (5);
INSERT INTO bug13894 VALUES (10);
INSERT INTO bug13894 VALUES (11);
INSERT INTO bug13894 VALUES (10);
SELECT * FROM bug13894;
val
5
10
11
10
UPDATE bug13894 SET val=6 WHERE val=10;
SELECT * FROM bug13894;
val
5
11
6
6
DROP TABLE bug13894;

18
mysql-test/t/csv.test
View File

@ -1314,4 +1314,22 @@ select period from t1;
drop table if exists t1,t2,t3,t4;
#
# Bug #13894 Server crashes on update of CSV table
#
--disable_warnings
DROP TABLE IF EXISTS bug13894;
--enable_warnings
CREATE TABLE bug13894 ( val integer ) ENGINE = CSV;
INSERT INTO bug13894 VALUES (5);
INSERT INTO bug13894 VALUES (10);
INSERT INTO bug13894 VALUES (11);
INSERT INTO bug13894 VALUES (10);
SELECT * FROM bug13894;
UPDATE bug13894 SET val=6 WHERE val=10;
SELECT * FROM bug13894;
DROP TABLE bug13894;
# End of 4.1 tests

17
sql/examples/ha_tina.cc
View File

@ -59,11 +59,15 @@ static int tina_init= 0;
*****************************************************************************/
/*
Used for sorting chains.
Used for sorting chains with qsort().
*/
int sort_set (tina_set *a, tina_set *b)
{
return ( a->begin > b->begin ? 1 : ( a->begin < b->begin ? -1 : 0 ) );
/*
We assume that intervals do not intersect. So, it is enought to compare
any two points. Here we take start of intervals for comparison.
*/
return ( a->begin > b->begin ? -1 : ( a->begin < b->begin ? 1 : 0 ) );
}
static byte* tina_get_key(TINA_SHARE *share,uint *length,
@ -739,13 +743,8 @@ int ha_tina::rnd_end()
qsort(chain, (size_t)(chain_ptr - chain), sizeof(tina_set), (qsort_cmp)sort_set);
for (ptr= chain; ptr < chain_ptr; ptr++)
{
/* We peek a head to see if this is the last chain */
if (ptr+1 == chain_ptr)
memmove(share->mapped_file + ptr->begin, share->mapped_file + ptr->end,
length - (size_t)ptr->end);
else
memmove((caddr_t)share->mapped_file + ptr->begin, (caddr_t)share->mapped_file + ptr->end,
(size_t)((ptr++)->begin - ptr->end));
memmove(share->mapped_file + ptr->begin, share->mapped_file + ptr->end,
length - (size_t)ptr->end);
length= length - (size_t)(ptr->end - ptr->begin);
}