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** Setup **
SET @session_sql_big_selects = @@SESSION.sql_big_selects;
SET @session_max_join_size = @@SESSION.max_join_size;
SET @global_max_join_size = @@GLOBAL.max_join_size;
SET MAX_JOIN_SIZE=9;
CREATE TEMPORARY TABLE t1(a varchar(20) not null, b varchar(20));
CREATE TEMPORARY TABLE t2(a varchar(20) null, b varchar(20));
INSERT INTO t1 VALUES('aa','bb');
INSERT INTO t1 VALUES('aa1','bb');
INSERT INTO t1 VALUES('aa2','bb');
INSERT INTO t1 VALUES('aa3','bb');
INSERT INTO t1 VALUES('aa4','bb');
INSERT INTO t2 VALUES('aa','bb');
INSERT INTO t2 VALUES('aa1','bb');
INSERT INTO t2 VALUES('aa2','bb');
INSERT INTO t2 VALUES('aa3','bb');
INSERT INTO t2 VALUES('aa4','bb');
'#--------------------FN_DYNVARS_154_01-------------------------#'
Expected error "Too big select"
SELECT * FROM t1 INNER JOIN t2 ON t1.a = t2.a;
ERROR 42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
Expected error The SELECT would examine more than MAX_JOIN_SIZE rows.
'#--------------------FN_DYNVARS_154_02-------------------------#'
SET SESSION SQL_BIG_SELECTS = 1;
SELECT * FROM t1 INNER JOIN t2 ON t1.a = t2.a;
a b a b
aa bb aa bb
aa1 bb aa1 bb
aa2 bb aa2 bb
aa3 bb aa3 bb
aa4 bb aa4 bb
This should work
SET SESSION SQL_BIG_SELECTS = 0;
DELETE FROM t2 WHERE a = 'aa4';
SELECT * FROM t1 INNER JOIN t2 ON t1.a = t2.a;
a b a b
aa bb aa bb
aa1 bb aa1 bb
aa2 bb aa2 bb
aa3 bb aa3 bb
This should work
'#--------------------FN_DYNVARS_154_03-------------------------#'
connect con_int1,localhost,root,,;
connection con_int1;
SELECT @@SESSION.sql_big_selects;
@@SESSION.sql_big_selects
1
1 Expected
SET SESSION sql_big_selects = 0;
connect con_int2,localhost,root,,;
connection con_int2;
SELECT @@SESSION.sql_big_selects;
@@SESSION.sql_big_selects
1
1 Expected
SET SESSION sql_big_selects = 1;
connection con_int1;
SELECT @@SESSION.sql_big_selects;
@@SESSION.sql_big_selects
0
0 Expected
connection con_int2;
SELECT @@SESSION.sql_big_selects;
@@SESSION.sql_big_selects
1
1 Expected
connection default;
disconnect con_int1;
disconnect con_int2;
SET @@SESSION.sql_big_selects = @session_sql_big_selects;
SET @@SESSION.max_join_size = @session_max_join_size;
SET @@GLOBAL.max_join_size = @global_max_join_size;
DROP TABLE t1;
DROP TABLE t2;