mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-19 05:22:25 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Merge spetrunia@bk-internal.mysql.com:/home/bk/mysql-5.0

Browse source 
into mysql.com:/home/psergey/mysql-5.0-bug19618
This commit is contained in:
sergefp@mysql.com 2006-05-16 13:46:30 +04:00
commit b7c52881d1
3 changed files with 109 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
mysql-test/r/func_in.result
View file

@ -326,3 +326,20 @@ deallocate prepare s;
set @str=NULL;
drop table t2;
drop table t1;
create table t1 (
some_id smallint(5) unsigned,
key (some_id)
);
insert into t1 values (1),(2);
select some_id from t1 where some_id not in(2,-1);
some_id
1
select some_id from t1 where some_id not in(-4,-1,-4);
some_id
1
2
select some_id from t1 where some_id not in(-4,-1,3423534,2342342);
some_id
1
2
drop table t1;

12
mysql-test/t/func_in.test
View file

@ -220,3 +220,15 @@ set @str=NULL;
drop table t2;
drop table t1;
# BUG#19618: Crash in range optimizer for
# "unsigned_keypart NOT IN(negative_number,...)"
# (introduced in fix BUG#15872)
create table t1 (
some_id smallint(5) unsigned,
key (some_id)
);
insert into t1 values (1),(2);
select some_id from t1 where some_id not in(2,-1);
select some_id from t1 where some_id not in(-4,-1,-4);
select some_id from t1 where some_id not in(-4,-1,3423534,2342342);
drop table t1;

109
sql/opt_range.cc
View file

@ -3503,17 +3503,46 @@ static SEL_TREE *get_func_mm_tree(PARAM *param, Item_func *cond_func,
if (inv)
{
/*
We get here for conditions like "t.keypart NOT IN (....)".
If the IN-list contains only constants (and func->array is an ordered
array of them), we construct the appropriate SEL_ARG tree manually,
because constructing it using the range analyzer (as
AND_i( t.keypart != c_i)) will cause lots of memory to be consumed
(see BUG#15872).
*/
if (func->array && func->cmp_type != ROW_RESULT)
{
/*
We get here for conditions in form "t.key NOT IN (c1, c2, ...)"
(where c{i} are constants).
Our goal is to produce a SEL_ARG graph that represents intervals:
($MIN<t.key<c1) OR (c1<t.key<c2) OR (c2<t.key<c3) OR ... (*)
where $MIN is either "-inf" or NULL.
The most straightforward way to handle NOT IN would be to convert
it to "(t.key != c1) AND (t.key != c2) AND ..." and let the range
optimizer to build SEL_ARG graph from that. However that will cause
the range optimizer to use O(N^2) memory (it's a bug, not filed),
and people do use big NOT IN lists (see BUG#15872). Also, for big
NOT IN lists constructing/using graph (*) does not make the query
faster.
So, we will handle NOT IN manually in the following way:
* if the number of entries in the NOT IN list is less then
NOT_IN_IGNORE_THRESHOLD, we will construct SEL_ARG graph (*)
manually.
* Otherwise, we will construct a smaller graph: for
"t.key NOT IN (c1,...cN)" we construct a graph representing
($MIN < t.key) OR (cN < t.key) // here sequence of c_i is
// ordered.
A note about partially-covering indexes: for those (e.g. for
"a CHAR(10), KEY(a(5))") the handling is correct (albeit not very
efficient):
Instead of "t.key < c1" we get "t.key <= prefix-val(c1)".
Combining the intervals in (*) together, we get:
(-inf<=t.key<=c1) OR (c1<=t.key<=c2) OR (c2<=t.key<=c3) OR ...
i.e. actually we get intervals combined into one interval:
(-inf<=t.key<=+inf). This doesn't make much sense but it doesn't
cause any problems.
*/
MEM_ROOT *tmp_root= param->mem_root;
param->thd->mem_root= param->old_root;
/*
Create one Item_type constant object. We'll need it as
get_mm_parts only accepts constant values wrapped in Item_Type
@ -3522,25 +3551,35 @@ static SEL_TREE *get_func_mm_tree(PARAM *param, Item_func *cond_func,
per-statement mem_root (while thd->mem_root is currently pointing
to mem_root local to range optimizer).
*/
MEM_ROOT *tmp_root= param->mem_root;
param->thd->mem_root= param->old_root;
Item *value_item= func->array->create_item();
param->thd->mem_root= tmp_root;
if (!value_item)
break;
/* Get a SEL_TREE for "-inf < X < c_0" interval */
func->array->value_to_item(0, value_item);
tree= get_mm_parts(param, cond_func, field, Item_func::LT_FUNC,
value_item, cmp_type);
if (!tree)
/* Get a SEL_TREE for "(-inf|NULL) < X < c_0" interval. */
uint i=0;
do
{
func->array->value_to_item(i, value_item);
tree= get_mm_parts(param, cond_func, field, Item_func::LT_FUNC,
value_item, cmp_type);
if (!tree)
break;
i++;
} while (i < func->array->count && tree->type == SEL_TREE::IMPOSSIBLE);
if (!tree || tree->type == SEL_TREE::IMPOSSIBLE)
{
/* We get here in cases like "t.unsigned NOT IN (-1,-2,-3) */
tree= NULL;
break;
}
#define NOT_IN_IGNORE_THRESHOLD 1000
SEL_TREE *tree2;
if (func->array->count < NOT_IN_IGNORE_THRESHOLD)
{
for (uint i=1; i < func->array->count; i++)
for (; i < func->array->count; i++)
{
if (func->array->compare_elems(i, i-1))
{
@ -3548,32 +3587,44 @@ static SEL_TREE *get_func_mm_tree(PARAM *param, Item_func *cond_func,
func->array->value_to_item(i, value_item);
tree2= get_mm_parts(param, cond_func, field, Item_func::LT_FUNC,
value_item, cmp_type);
if (!tree2)
{
tree= NULL;
break;
}
/* Change all intervals to be "c_{i-1} < X < c_i" */
for (uint idx= 0; idx < param->keys; idx++)
{
SEL_ARG *new_interval;
if ((new_interval= tree2->keys[idx]))
SEL_ARG *new_interval, *last_val;
if (((new_interval= tree2->keys[idx])) &&
((last_val= tree->keys[idx]->last())))
{
SEL_ARG *last_val= tree->keys[idx]->last();
new_interval->min_value= last_val->max_value;
new_interval->min_flag= NEAR_MIN;
}
}
/*
The following doesn't try to allocate memory so no need to
check for NULL.
*/
tree= tree_or(param, tree, tree2);
}
}
}
else
func->array->value_to_item(func->array->count - 1, value_item);
/*
Get the SEL_TREE for the last "c_last < X < +inf" interval
(value_item cotains c_last already)
*/
tree2= get_mm_parts(param, cond_func, field, Item_func::GT_FUNC,
value_item, cmp_type);
tree= tree_or(param, tree, tree2);
if (tree && tree->type != SEL_TREE::IMPOSSIBLE)
{
/*
Get the SEL_TREE for the last "c_last < X < +inf" interval
(value_item cotains c_last already)
*/
tree2= get_mm_parts(param, cond_func, field, Item_func::GT_FUNC,
value_item, cmp_type);
tree= tree_or(param, tree, tree2);
}
}
else
{