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MDEV-6289 : Unexpected results when querying information_schema

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- When traversing JOIN_TABs with first_linear_tab/next_linear_tab(), don't forget
  to enter the semi-join nest when it is the first table in the join order.
  Failure to do so could cause e.g. I_S tables not to be filled.
This commit is contained in:
Sergey Petrunya 2014-07-23 19:53:29 +04:00
parent 07cb53c58b
commit 6b353dd1de
8 changed files with 158 additions and 27 deletions
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37
mysql-test/r/subselect_mat.result
View File

@ -2108,6 +2108,43 @@ EXECUTE stmt;
a
DROP TABLE t1, t2;
DROP VIEW v2;
#
# MDEV-6289 : Unexpected results when querying information_schema
#
CREATE TABLE t1 (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
db varchar(254) NOT NULL DEFAULT '',
PRIMARY KEY (id),
UNIQUE KEY db (db)
) DEFAULT CHARSET=utf8;
INSERT INTO t1 (db) VALUES ('mysqltest1'),('mysqltest2'),('mysqltest3'),('mysqltest4');
drop database if exists mysqltest1;
drop database if exists mysqltest2;
drop database if exists mysqltest3;
drop database if exists mysqltest4;
create database mysqltest1;
create database mysqltest2;
create database mysqltest3;
create database mysqltest4;
SELECT db FROM t1 WHERE db IN (SELECT SCHEMA_NAME FROM information_schema.SCHEMATA) ORDER BY db DESC;
db
mysqltest4
mysqltest3
mysqltest2
mysqltest1
EXPLAIN EXTENDED
SELECT db FROM t1 WHERE db IN (SELECT SCHEMA_NAME FROM information_schema.SCHEMATA) ORDER BY db DESC;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 2 100.00 Using temporary; Using filesort
1 PRIMARY t1 eq_ref db db 764 information_schema.SCHEMATA.SCHEMA_NAME 1 100.00 Using where; Using index
2 MATERIALIZED SCHEMATA ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t1`.`db` AS `db` from `test`.`t1` semi join (`information_schema`.`SCHEMATA`) where (`test`.`t1`.`db` = `information_schema`.`SCHEMATA`.`SCHEMA_NAME`) order by `test`.`t1`.`db` desc
drop table t1;
drop database mysqltest1;
drop database mysqltest2;
drop database mysqltest3;
drop database mysqltest4;
# End of 5.5 tests
set @subselect_mat_test_optimizer_switch_value=null;
set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off';

37
mysql-test/r/subselect_sj_mat.result
View File

@ -2148,4 +2148,41 @@ EXECUTE stmt;
a
DROP TABLE t1, t2;
DROP VIEW v2;
#
# MDEV-6289 : Unexpected results when querying information_schema
#
CREATE TABLE t1 (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
db varchar(254) NOT NULL DEFAULT '',
PRIMARY KEY (id),
UNIQUE KEY db (db)
) DEFAULT CHARSET=utf8;
INSERT INTO t1 (db) VALUES ('mysqltest1'),('mysqltest2'),('mysqltest3'),('mysqltest4');
drop database if exists mysqltest1;
drop database if exists mysqltest2;
drop database if exists mysqltest3;
drop database if exists mysqltest4;
create database mysqltest1;
create database mysqltest2;
create database mysqltest3;
create database mysqltest4;
SELECT db FROM t1 WHERE db IN (SELECT SCHEMA_NAME FROM information_schema.SCHEMATA) ORDER BY db DESC;
db
mysqltest4
mysqltest3
mysqltest2
mysqltest1
EXPLAIN EXTENDED
SELECT db FROM t1 WHERE db IN (SELECT SCHEMA_NAME FROM information_schema.SCHEMATA) ORDER BY db DESC;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 2 100.00 Using temporary; Using filesort
1 PRIMARY t1 eq_ref db db 764 information_schema.SCHEMATA.SCHEMA_NAME 1 100.00 Using where; Using index
2 MATERIALIZED SCHEMATA ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 select `test`.`t1`.`db` AS `db` from `test`.`t1` semi join (`information_schema`.`SCHEMATA`) where (`test`.`t1`.`db` = `information_schema`.`SCHEMATA`.`SCHEMA_NAME`) order by `test`.`t1`.`db` desc
drop table t1;
drop database mysqltest1;
drop database mysqltest2;
drop database mysqltest3;
drop database mysqltest4;
# End of 5.5 tests

33
mysql-test/t/subselect_sj_mat.test
View File

@ -1808,5 +1808,38 @@ EXECUTE stmt;
DROP TABLE t1, t2;
DROP VIEW v2;
--echo #
--echo # MDEV-6289 : Unexpected results when querying information_schema
--echo #
CREATE TABLE t1 (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
db varchar(254) NOT NULL DEFAULT '',
PRIMARY KEY (id),
UNIQUE KEY db (db)
) DEFAULT CHARSET=utf8;
INSERT INTO t1 (db) VALUES ('mysqltest1'),('mysqltest2'),('mysqltest3'),('mysqltest4');
--disable_warnings
drop database if exists mysqltest1;
drop database if exists mysqltest2;
drop database if exists mysqltest3;
drop database if exists mysqltest4;
--enable_warnings
create database mysqltest1;
create database mysqltest2;
create database mysqltest3;
create database mysqltest4;
SELECT db FROM t1 WHERE db IN (SELECT SCHEMA_NAME FROM information_schema.SCHEMATA) ORDER BY db DESC;
EXPLAIN EXTENDED
SELECT db FROM t1 WHERE db IN (SELECT SCHEMA_NAME FROM information_schema.SCHEMATA) ORDER BY db DESC;
drop table t1;
drop database mysqltest1;
drop database mysqltest2;
drop database mysqltest3;
drop database mysqltest4;
--echo # End of 5.5 tests

5
sql/item_subselect.cc
View File

@ -3200,8 +3200,9 @@ int subselect_single_select_engine::exec()
pushed down into the subquery. Those optimizations are ref[_or_null]
acceses. Change them to be full table scans.
*/
for (JOIN_TAB *tab= first_linear_tab(join, WITHOUT_CONST_TABLES); tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
JOIN_TAB *tab;
for (tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab; tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
if (tab && tab->keyuse)
{

3
sql/sql_delete.cc
View File

@ -673,7 +673,8 @@ multi_delete::initialize_tables(JOIN *join)
walk= delete_tables;
for (JOIN_TAB *tab= first_linear_tab(join, WITH_CONST_TABLES);
for (JOIN_TAB *tab= first_linear_tab(join, WITHOUT_BUSH_ROOTS,
WITH_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITHOUT_BUSH_ROOTS))
{

61
sql/sql_select.cc
View File

@ -1332,7 +1332,8 @@ JOIN::optimize()
Perform the optimization on fields evaluation mentioned above
for all on expressions.
*/
for (JOIN_TAB *tab= first_linear_tab(this, WITHOUT_CONST_TABLES); tab;
JOIN_TAB *tab;
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES); tab;
tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
if (*tab->on_expr_ref)
@ -1355,7 +1356,7 @@ JOIN::optimize()
Perform the optimization on fields evaliation mentioned above
for all used ref items.
*/
for (JOIN_TAB *tab= first_linear_tab(this, WITHOUT_CONST_TABLES); tab;
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES); tab;
tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
uint key_copy_index=0;
@ -1980,7 +1981,8 @@ bool JOIN::setup_subquery_caches()
if (conds)
conds= conds->transform(&Item::expr_cache_insert_transformer,
(uchar*) thd);
for (JOIN_TAB *tab= first_linear_tab(this, WITHOUT_CONST_TABLES);
JOIN_TAB *tab;
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab; tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
if (tab->select_cond)
@ -2143,7 +2145,8 @@ JOIN::reinit()
/* need to reset ref access state (see join_read_key) */
if (join_tab)
{
for (JOIN_TAB *tab= first_linear_tab(this, WITH_CONST_TABLES); tab;
JOIN_TAB *tab;
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITH_CONST_TABLES); tab;
tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
tab->ref.key_err= TRUE;
@ -2907,8 +2910,9 @@ JOIN::destroy()
{
if (join_tab != tmp_join->join_tab)
{
for (JOIN_TAB *tab= first_linear_tab(this, WITH_CONST_TABLES); tab;
tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
JOIN_TAB *tab;
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITH_CONST_TABLES);
tab; tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
tab->cleanup();
}
@ -7520,14 +7524,24 @@ JOIN_TAB *next_top_level_tab(JOIN *join, JOIN_TAB *tab)
}
JOIN_TAB *first_linear_tab(JOIN *join, enum enum_with_const_tables const_tbls)
JOIN_TAB *first_linear_tab(JOIN *join,
enum enum_with_bush_roots include_bush_roots,
enum enum_with_const_tables const_tbls)
{
JOIN_TAB *first= join->join_tab;
if (const_tbls == WITHOUT_CONST_TABLES)
first+= join->const_tables;
if (first < join->join_tab + join->top_join_tab_count)
return first;
return NULL; /* All tables were const tables */
if (first >= join->join_tab + join->top_join_tab_count)
return NULL; /* All are const tables */
if (first->bush_children && include_bush_roots == WITHOUT_BUSH_ROOTS)
{
/* This JOIN_TAB is a SJM nest; Start from first table in nest */
return first->bush_children->start;
}
return first;
}
@ -8364,9 +8378,10 @@ inline void add_cond_and_fix(THD *thd, Item **e1, Item *e2)
static void add_not_null_conds(JOIN *join)
{
JOIN_TAB *tab;
DBUG_ENTER("add_not_null_conds");
for (JOIN_TAB *tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
for (tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
@ -8537,7 +8552,7 @@ make_outerjoin_info(JOIN *join)
tab->table->pos_in_table_list being set.
*/
JOIN_TAB *tab;
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
for (tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
@ -8549,7 +8564,7 @@ make_outerjoin_info(JOIN *join)
}
}
for (JOIN_TAB *tab= first_linear_tab(join, WITHOUT_CONST_TABLES); tab;
for (JOIN_TAB *tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES); tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
TABLE *table= tab->table;
@ -9309,7 +9324,7 @@ bool generate_derived_keys(DYNAMIC_ARRAY *keyuse_array)
void JOIN::drop_unused_derived_keys()
{
JOIN_TAB *tab;
for (tab= first_linear_tab(this, WITHOUT_CONST_TABLES);
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
@ -9997,7 +10012,7 @@ void check_join_cache_usage_for_tables(JOIN *join, ulonglong options,
JOIN_TAB *tab;
JOIN_TAB *prev_tab;
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
for (tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
@ -10005,7 +10020,7 @@ void check_join_cache_usage_for_tables(JOIN *join, ulonglong options,
}
uint idx= join->const_tables;
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
for (tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
@ -10099,7 +10114,8 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
tab->partial_join_cardinality= 1;
JOIN_TAB *prev_tab= NULL;
for (tab= first_linear_tab(join, WITHOUT_CONST_TABLES), i= join->const_tables;
i= join->const_tables;
for (tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
prev_tab=tab, tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
@ -10124,7 +10140,7 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
check_join_cache_usage_for_tables(join, options, no_jbuf_after);
JOIN_TAB *first_tab;
for (tab= first_tab= first_linear_tab(join, WITHOUT_CONST_TABLES);
for (tab= first_tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITHOUT_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITH_BUSH_ROOTS))
{
@ -10800,7 +10816,8 @@ void JOIN::cleanup(bool full)
}
if (full)
{
JOIN_TAB *sort_tab= first_linear_tab(this, WITHOUT_CONST_TABLES);
JOIN_TAB *sort_tab= first_linear_tab(this, WITH_BUSH_ROOTS,
WITHOUT_CONST_TABLES);
if (pre_sort_join_tab)
{
if (sort_tab && sort_tab->select == pre_sort_join_tab->select)
@ -10847,7 +10864,7 @@ void JOIN::cleanup(bool full)
}
else
{
for (tab= first_linear_tab(this, WITH_CONST_TABLES); tab;
for (tab= first_linear_tab(this, WITH_BUSH_ROOTS, WITH_CONST_TABLES); tab;
tab= next_linear_tab(this, tab, WITH_BUSH_ROOTS))
{
if (tab->table)
@ -11009,7 +11026,9 @@ only_eq_ref_tables(JOIN *join,ORDER *order,table_map tables)
static void update_depend_map(JOIN *join)
{
for (JOIN_TAB *join_tab= first_linear_tab(join, WITH_CONST_TABLES); join_tab;
JOIN_TAB *join_tab;
for (join_tab= first_linear_tab(join, WITH_BUSH_ROOTS, WITH_CONST_TABLES);
join_tab;
join_tab= next_linear_tab(join, join_tab, WITH_BUSH_ROOTS))
{
TABLE_REF *ref= &join_tab->ref;

4
sql/sql_select.h
View File

@ -1458,7 +1458,9 @@ private:
enum enum_with_bush_roots { WITH_BUSH_ROOTS, WITHOUT_BUSH_ROOTS};
enum enum_with_const_tables { WITH_CONST_TABLES, WITHOUT_CONST_TABLES};
JOIN_TAB *first_linear_tab(JOIN *join, enum enum_with_const_tables const_tbls);
JOIN_TAB *first_linear_tab(JOIN *join,
enum enum_with_bush_roots include_bush_roots,
enum enum_with_const_tables const_tbls);
JOIN_TAB *next_linear_tab(JOIN* join, JOIN_TAB* tab,
enum enum_with_bush_roots include_bush_roots);

5
sql/sql_show.cc
View File

@ -7708,8 +7708,9 @@ bool get_schema_tables_result(JOIN *join,
Warnings_only_error_handler err_handler;
thd->push_internal_handler(&err_handler);
old_proc_info= thd_proc_info(thd, "Filling schema table");
for (JOIN_TAB *tab= first_linear_tab(join, WITH_CONST_TABLES);
JOIN_TAB *tab;
for (tab= first_linear_tab(join, WITHOUT_BUSH_ROOTS, WITH_CONST_TABLES);
tab;
tab= next_linear_tab(join, tab, WITHOUT_BUSH_ROOTS))
{