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BUG#49902 - SELECT returns incorrect results

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Queries optimized with GROUP_MIN_MAX didn't cleanup KEYREAD
optimization properly. As a result subsequent queries may
return incomplete rows (fields are initialized to default
values).

mysql-test/r/group_min_max.result:
  A test case for BUG#49902.
mysql-test/t/group_min_max.test:
  A test case for BUG#49902.
sql/opt_range.cc:
  Refactor of KEYREAD optimization switch so that KEYREAD
  handler state is in sync with st_table::key_read flag.
  
  All SQL code is supposed to switch KEYREAD optimization
  via st_table::set_keyread().
sql/opt_sum.cc:
  Refactor of KEYREAD optimization switch so that KEYREAD
  handler state is in sync with st_table::key_read flag.
  
  All SQL code is supposed to switch KEYREAD optimization
  via st_table::set_keyread().
sql/sql_select.cc:
  Refactor of KEYREAD optimization switch so that KEYREAD
  handler state is in sync with st_table::key_read flag.
  
  All SQL code is supposed to switch KEYREAD optimization
  via st_table::set_keyread().
sql/sql_update.cc:
  Refactor of KEYREAD optimization switch so that KEYREAD
  handler state is in sync with st_table::key_read flag.
  
  All SQL code is supposed to switch KEYREAD optimization
  via st_table::set_keyread().
sql/table.cc:
  Refactor of KEYREAD optimization switch so that KEYREAD
  handler state is in sync with st_table::key_read flag.
  
  All SQL code is supposed to switch KEYREAD optimization
  via st_table::set_keyread().
sql/table.h:
  Refactor of KEYREAD optimization switch so that KEYREAD
  handler state is in sync with st_table::key_read flag.
  
  All SQL code is supposed to switch KEYREAD optimization
  via st_table::set_keyread().
This commit is contained in:
Sergey Vojtovich 2010-02-09 12:53:13 +04:00
parent c12c9780cd
commit 0897669cba
8 changed files with 62 additions and 87 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
mysql-test/r/group_min_max.result
View File

@ -2524,4 +2524,17 @@ SELECT a, MAX(b) FROM t WHERE b GROUP BY a;
a MAX(b)
2 1
DROP TABLE t;
CREATE TABLE t1(a INT NOT NULL, b INT NOT NULL, KEY (b));
INSERT INTO t1 VALUES(1,1),(2,1);
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
SELECT 1 AS c, b FROM t1 WHERE b IN (1,2) GROUP BY c, b;
c b
1 1
SELECT a FROM t1 WHERE b=1;
a
1
2
DROP TABLE t1;
End of 5.1 tests

10
mysql-test/t/group_min_max.test
View File

@ -1044,4 +1044,14 @@ SELECT a, MAX(b) FROM t WHERE b GROUP BY a;
DROP TABLE t;
#
# BUG#49902 - SELECT returns incorrect results
#
CREATE TABLE t1(a INT NOT NULL, b INT NOT NULL, KEY (b));
INSERT INTO t1 VALUES(1,1),(2,1);
ANALYZE TABLE t1;
SELECT 1 AS c, b FROM t1 WHERE b IN (1,2) GROUP BY c, b;
SELECT a FROM t1 WHERE b=1;
DROP TABLE t1;
--echo End of 5.1 tests

15
sql/opt_range.cc
View File

@ -1171,11 +1171,7 @@ QUICK_RANGE_SELECT::~QUICK_RANGE_SELECT()
if (file)
{
range_end();
if (head->key_read)
{
head->key_read= 0;
file->extra(HA_EXTRA_NO_KEYREAD);
}
head->set_keyread(FALSE);
if (free_file)
{
DBUG_PRINT("info", ("Freeing separate handler 0x%lx (free: %d)", (long) file,
@ -1377,10 +1373,7 @@ end:
head->file= file;
/* We don't have to set 'head->keyread' here as the 'file' is unique */
if (!head->no_keyread)
{
head->key_read= 1;
head->mark_columns_used_by_index(index);
}
head->prepare_for_position();
head->file= org_file;
bitmap_copy(&column_bitmap, head->read_set);
@ -8165,7 +8158,7 @@ int QUICK_INDEX_MERGE_SELECT::read_keys_and_merge()
DBUG_ENTER("QUICK_INDEX_MERGE_SELECT::read_keys_and_merge");
/* We're going to just read rowids. */
file->extra(HA_EXTRA_KEYREAD);
head->set_keyread(TRUE);
head->prepare_for_position();
cur_quick_it.rewind();
@ -8241,7 +8234,7 @@ int QUICK_INDEX_MERGE_SELECT::read_keys_and_merge()
delete unique;
doing_pk_scan= FALSE;
/* index_merge currently doesn't support "using index" at all */
file->extra(HA_EXTRA_NO_KEYREAD);
head->set_keyread(FALSE);
init_read_record(&read_record, thd, head, (SQL_SELECT*) 0, 1 , 1, TRUE);
DBUG_RETURN(result);
}
@ -10628,7 +10621,7 @@ int QUICK_GROUP_MIN_MAX_SELECT::reset(void)
int result;
DBUG_ENTER("QUICK_GROUP_MIN_MAX_SELECT::reset");
file->extra(HA_EXTRA_KEYREAD); /* We need only the key attributes */
head->set_keyread(TRUE); /* We need only the key attributes */
if ((result= file->ha_index_init(index,1)))
DBUG_RETURN(result);
if (quick_prefix_select && quick_prefix_select->reset())

17
sql/opt_sum.cc
View File

@ -326,11 +326,7 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
if (!error && reckey_in_range(0, &ref, item_field->field,
conds, range_fl, prefix_len))
error= HA_ERR_KEY_NOT_FOUND;
if (table->key_read)
{
table->key_read= 0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
table->set_keyread(FALSE);
table->file->ha_index_end();
if (error)
{
@ -413,11 +409,7 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
if (!error && reckey_in_range(1, &ref, item_field->field,
conds, range_fl, prefix_len))
error= HA_ERR_KEY_NOT_FOUND;
if (table->key_read)
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
table->set_keyread(FALSE);
table->file->ha_index_end();
if (error)
{
@ -876,10 +868,7 @@ static bool find_key_for_maxmin(bool max_fl, TABLE_REF *ref,
converted (for example to upper case)
*/
if (field->part_of_key.is_set(idx))
{
table->key_read= 1;
table->file->extra(HA_EXTRA_KEYREAD);
}
table->set_keyread(TRUE);
return 1;
}
}

66
sql/sql_select.cc
View File

@ -6594,10 +6594,7 @@ make_join_readinfo(JOIN *join, ulonglong options)
case JT_CONST: // Only happens with left join
if (table->covering_keys.is_set(tab->ref.key) &&
!table->no_keyread)
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
table->set_keyread(TRUE);
break;
case JT_ALL:
/*
@ -6658,10 +6655,7 @@ make_join_readinfo(JOIN *join, ulonglong options)
if (tab->select && tab->select->quick &&
tab->select->quick->index != MAX_KEY && //not index_merge
table->covering_keys.is_set(tab->select->quick->index))
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
table->set_keyread(TRUE);
else if (!table->covering_keys.is_clear_all() &&
!(tab->select && tab->select->quick))
{ // Only read index tree
@ -6745,11 +6739,7 @@ void JOIN_TAB::cleanup()
limit= 0;
if (table)
{
if (table->key_read)
{
table->key_read= 0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
table->set_keyread(FALSE);
table->file->ha_index_or_rnd_end();
/*
We need to reset this for next select
@ -11595,16 +11585,11 @@ join_read_const_table(JOIN_TAB *tab, POSITION *pos)
!table->no_keyread &&
(int) table->reginfo.lock_type <= (int) TL_READ_HIGH_PRIORITY)
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
table->set_keyread(TRUE);
tab->index= tab->ref.key;
}
error=join_read_const(tab);
if (table->key_read)
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
table->set_keyread(FALSE);
if (error)
{
tab->info="unique row not found";
@ -11959,12 +11944,8 @@ join_read_first(JOIN_TAB *tab)
{
int error;
TABLE *table=tab->table;
if (!table->key_read && table->covering_keys.is_set(tab->index) &&
!table->no_keyread)
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
if (table->covering_keys.is_set(tab->index) && !table->no_keyread)
table->set_keyread(TRUE);
tab->table->status=0;
tab->read_record.read_record=join_read_next;
tab->read_record.table=table;
@ -11998,12 +11979,8 @@ join_read_last(JOIN_TAB *tab)
{
TABLE *table=tab->table;
int error;
if (!table->key_read && table->covering_keys.is_set(tab->index) &&
!table->no_keyread)
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
if (table->covering_keys.is_set(tab->index) && !table->no_keyread)
table->set_keyread(TRUE);
tab->table->status=0;
tab->read_record.read_record=join_read_prev;
tab->read_record.table=table;
@ -13413,11 +13390,8 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
If ref_key used index tree reading only ('Using index' in EXPLAIN),
and best_key doesn't, then revert the decision.
*/
if (!table->covering_keys.is_set(best_key) && table->key_read)
{
table->key_read= 0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
if (!table->covering_keys.is_set(best_key))
table->set_keyread(FALSE);
if (!quick_created)
{
tab->index= best_key;
@ -13430,10 +13404,7 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
select->quick= 0;
}
if (table->covering_keys.is_set(best_key))
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
table->set_keyread(TRUE);
table->file->ha_index_or_rnd_end();
if (join->select_options & SELECT_DESCRIBE)
{
@ -13607,11 +13578,8 @@ create_sort_index(THD *thd, JOIN *join, ORDER *order,
We can only use 'Only index' if quick key is same as ref_key
and in index_merge 'Only index' cannot be used
*/
if (table->key_read && ((uint) tab->ref.key != select->quick->index))
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
if (((uint) tab->ref.key != select->quick->index))
table->set_keyread(FALSE);
}
else
{
@ -13667,11 +13635,7 @@ create_sort_index(THD *thd, JOIN *join, ORDER *order,
tab->type=JT_ALL; // Read with normal read_record
tab->read_first_record= join_init_read_record;
tab->join->examined_rows+=examined_rows;
if (table->key_read) // Restore if we used indexes
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
table->set_keyread(FALSE); // Restore if we used indexes
DBUG_RETURN(table->sort.found_records == HA_POS_ERROR);
err:
DBUG_RETURN(-1);

9
sql/sql_update.cc
View File

@ -397,10 +397,7 @@ int mysql_update(THD *thd,
matching rows before updating the table!
*/
if (used_index < MAX_KEY && old_covering_keys.is_set(used_index))
{
table->key_read=1;
table->mark_columns_used_by_index(used_index);
}
else
{
table->use_all_columns();
@ -844,11 +841,7 @@ int mysql_update(THD *thd,
err:
delete select;
free_underlaid_joins(thd, select_lex);
if (table->key_read)
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
table->set_keyread(FALSE);
thd->abort_on_warning= 0;
DBUG_RETURN(1);
}

5
sql/table.cc
View File

@ -4374,7 +4374,7 @@ void st_table::mark_columns_used_by_index(uint index)
MY_BITMAP *bitmap= &tmp_set;
DBUG_ENTER("st_table::mark_columns_used_by_index");
(void) file->extra(HA_EXTRA_KEYREAD);
set_keyread(TRUE);
bitmap_clear_all(bitmap);
mark_columns_used_by_index_no_reset(index, bitmap);
column_bitmaps_set(bitmap, bitmap);
@ -4397,8 +4397,7 @@ void st_table::restore_column_maps_after_mark_index()
{
DBUG_ENTER("st_table::restore_column_maps_after_mark_index");
key_read= 0;
(void) file->extra(HA_EXTRA_NO_KEYREAD);
set_keyread(FALSE);
default_column_bitmaps();
file->column_bitmaps_signal();
DBUG_VOID_RETURN;

14
sql/table.h
View File

@ -902,6 +902,20 @@ struct st_table {
inline bool needs_reopen_or_name_lock()
{ return s->version != refresh_version; }
bool is_children_attached(void);
inline void set_keyread(bool flag)
{
DBUG_ASSERT(file);
if (flag && !key_read)
{
key_read= 1;
file->extra(HA_EXTRA_KEYREAD);
}
else if (!flag && key_read)
{
key_read= 0;
file->extra(HA_EXTRA_NO_KEYREAD);
}
}
};
enum enum_schema_table_state