MDEV-11274: Executing EXPLAIN of complex query over join limit causes server to crash

For this case we have a view that is mergeable but we are not able to merge it in the
parent select because that would exceed the maximum tables allowed in the join list, so we
materialise this view
TABLE_LIST::dervied is NULL for such views, it is only set for views which have ALGORITHM=TEMPTABLE
Fixed by making sure TABLE_LIST::derived is set for views that could not be merged

3 files changed, 394 insertions, 0 deletions

diff --git a/mysql-test/r/view.result b/mysql-test/r/view.result
index 1d12c50954f..7fc3c48c3a0 100644
--- a/mysql-test/r/view.result
+++ b/mysql-test/r/view.result
@@ -5535,6 +5535,203 @@ View	Create View	character_set_client	collation_connection
 v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select group_concat(`t1`.`str` separator '\\') AS `GROUP_CONCAT(str  SEPARATOR  '\\')` from `t1`	latin1	latin1_swedish_ci
 drop view v1;
 drop table t1;
+CREATE TABLE IF NOT EXISTS t0 (f0 INT);
+CREATE TABLE IF NOT EXISTS t1 (f1 INT);
+CREATE TABLE IF NOT EXISTS t2 (f2 INT);
+CREATE TABLE IF NOT EXISTS t3 (f3 INT);
+CREATE TABLE IF NOT EXISTS t4 (f4 INT);
+CREATE TABLE IF NOT EXISTS t5 (f5 INT);
+CREATE TABLE IF NOT EXISTS t6 (f6 INT);
+CREATE TABLE IF NOT EXISTS t7 (f7 INT);
+CREATE TABLE IF NOT EXISTS t8 (f8 INT);
+CREATE TABLE IF NOT EXISTS t9 (f9 INT);
+CREATE TABLE IF NOT EXISTS t10 (f10 INT);
+CREATE TABLE IF NOT EXISTS t11 (f11 INT);
+CREATE TABLE IF NOT EXISTS t12 (f12 INT);
+CREATE TABLE IF NOT EXISTS t13 (f13 INT);
+CREATE TABLE IF NOT EXISTS t14 (f14 INT);
+CREATE TABLE IF NOT EXISTS t15 (f15 INT);
+CREATE TABLE IF NOT EXISTS t16 (f16 INT);
+CREATE TABLE IF NOT EXISTS t17 (f17 INT);
+CREATE TABLE IF NOT EXISTS t18 (f18 INT);
+CREATE TABLE IF NOT EXISTS t19 (f19 INT);
+CREATE TABLE IF NOT EXISTS t20 (f20 INT);
+CREATE TABLE IF NOT EXISTS t21 (f21 INT);
+CREATE TABLE IF NOT EXISTS t22 (f22 INT);
+CREATE TABLE IF NOT EXISTS t23 (f23 INT);
+CREATE TABLE IF NOT EXISTS t24 (f24 INT);
+CREATE TABLE IF NOT EXISTS t25 (f25 INT);
+CREATE TABLE IF NOT EXISTS t26 (f26 INT);
+CREATE TABLE IF NOT EXISTS t27 (f27 INT);
+CREATE TABLE IF NOT EXISTS t28 (f28 INT);
+CREATE TABLE IF NOT EXISTS t29 (f29 INT);
+CREATE TABLE IF NOT EXISTS t30 (f30 INT);
+CREATE TABLE IF NOT EXISTS t31 (f31 INT);
+CREATE TABLE IF NOT EXISTS t32 (f32 INT);
+CREATE TABLE IF NOT EXISTS t33 (f33 INT);
+CREATE TABLE IF NOT EXISTS t34 (f34 INT);
+CREATE TABLE IF NOT EXISTS t35 (f35 INT);
+CREATE TABLE IF NOT EXISTS t36 (f36 INT);
+CREATE TABLE IF NOT EXISTS t37 (f37 INT);
+CREATE TABLE IF NOT EXISTS t38 (f38 INT);
+CREATE TABLE IF NOT EXISTS t39 (f39 INT);
+CREATE TABLE IF NOT EXISTS t40 (f40 INT);
+CREATE TABLE IF NOT EXISTS t41 (f41 INT);
+CREATE TABLE IF NOT EXISTS t42 (f42 INT);
+CREATE TABLE IF NOT EXISTS t43 (f43 INT);
+CREATE TABLE IF NOT EXISTS t44 (f44 INT);
+CREATE TABLE IF NOT EXISTS t45 (f45 INT);
+CREATE TABLE IF NOT EXISTS t46 (f46 INT);
+CREATE TABLE IF NOT EXISTS t47 (f47 INT);
+CREATE TABLE IF NOT EXISTS t48 (f48 INT);
+CREATE TABLE IF NOT EXISTS t49 (f49 INT);
+CREATE TABLE IF NOT EXISTS t50 (f50 INT);
+CREATE TABLE IF NOT EXISTS t51 (f51 INT);
+CREATE TABLE IF NOT EXISTS t52 (f52 INT);
+CREATE TABLE IF NOT EXISTS t53 (f53 INT);
+CREATE TABLE IF NOT EXISTS t54 (f54 INT);
+CREATE TABLE IF NOT EXISTS t55 (f55 INT);
+CREATE TABLE IF NOT EXISTS t56 (f56 INT);
+CREATE TABLE IF NOT EXISTS t57 (f57 INT);
+CREATE TABLE IF NOT EXISTS t58 (f58 INT);
+CREATE TABLE IF NOT EXISTS t59 (f59 INT);
+CREATE TABLE IF NOT EXISTS t60 (f60 INT);
+CREATE OR REPLACE VIEW v60 AS SELECT * FROM t60;
+EXPLAIN
+SELECT t0.*
+FROM t0
+JOIN t1
+ON t1.f1 = t0.f0
+LEFT JOIN t2
+ON t0.f0 = t2.f2
+LEFT JOIN t3
+ON t0.f0 = t3.f3
+LEFT JOIN t4
+ON t0.f0 = t4.f4
+LEFT JOIN t5
+ON t4.f4 = t5.f5
+LEFT JOIN t6
+ON t0.f0 = t6.f6
+LEFT JOIN t7
+ON t0.f0 = t7.f7
+LEFT JOIN t8
+ON t0.f0 = t8.f8
+LEFT JOIN t9
+ON t0.f0 = t9.f9
+LEFT JOIN t10
+ON t0.f0 = t10.f10
+LEFT JOIN t11
+ON t0.f0 = t11.f11
+LEFT JOIN t12
+ON t0.f0 = t12.f12
+LEFT JOIN t13
+ON t0.f0 = t13.f13
+LEFT JOIN t14
+ON t0.f0 = t14.f14
+LEFT JOIN t15
+ON t0.f0 = t15.f15
+LEFT JOIN t16
+ON t0.f0 = t16.f16
+LEFT JOIN t17
+ON t0.f0 = t17.f17
+LEFT JOIN t18
+ON t0.f0 = t18.f18
+LEFT JOIN t19
+ON t18.f18 = t19.f19
+LEFT JOIN t20
+ON t20.f20 = t19.f19
+LEFT JOIN t21
+ON t20.f20 = t21.f21
+LEFT JOIN t22
+ON t19.f19 = t22.f22
+LEFT JOIN t23
+ON t23.f23 = t0.f0
+LEFT JOIN t24
+ON t24.f24 = t23.f23
+LEFT JOIN t25
+ON t0.f0 = t25.f25
+LEFT JOIN t26
+ON t26.f26 = t0.f0
+LEFT JOIN t27
+ON t27.f27 = t0.f0
+LEFT JOIN t28
+ON t0.f0 = t28.f28
+LEFT JOIN t29
+ON t0.f0 = t29.f29
+LEFT JOIN t30
+ON t30.f30 = t0.f0
+LEFT JOIN t31
+ON t0.f0 = t31.f31
+LEFT JOIN t32
+ON t32.f32 = t31.f31
+LEFT JOIN t33
+ON t33.f33 = t0.f0
+LEFT JOIN t34
+ON t33.f33 = t34.f34
+LEFT JOIN t35
+ON t33.f33 = t35.f35
+LEFT JOIN t36
+ON t36.f36 = t0.f0
+LEFT JOIN t37
+ON t32.f32 = t37.f37
+LEFT JOIN t38
+ON t31.f31 = t38.f38
+LEFT JOIN t39
+ON t39.f39 = t0.f0
+LEFT JOIN t40
+ON t40.f40 = t39.f39
+LEFT JOIN t41
+ON t41.f41 = t0.f0
+LEFT JOIN t42
+ON t42.f42 = t41.f41
+LEFT JOIN t43
+ON t43.f43 = t41.f41
+LEFT JOIN t44
+ON t44.f44 = t0.f0
+LEFT JOIN t45
+ON t45.f45 = t0.f0
+LEFT JOIN t46
+ON t46.f46 = t0.f0
+LEFT JOIN t47
+ON t47.f47 = t0.f0
+LEFT JOIN t48
+ON t48.f48 = t0.f0
+LEFT JOIN t49
+ON t0.f0 = t49.f49
+LEFT JOIN t50
+ON t0.f0 = t50.f50
+LEFT JOIN t51
+ON t0.f0 = t51.f51
+LEFT JOIN t52
+ON t52.f52 = t0.f0
+LEFT JOIN t53
+ON t53.f53 = t0.f0
+LEFT JOIN t54
+ON t54.f54 = t0.f0
+LEFT JOIN t55
+ON t55.f55 = t0.f0
+LEFT JOIN t56
+ON t56.f56 = t0.f0
+LEFT JOIN t57
+ON t57.f57 = t0.f0
+LEFT JOIN t58
+ON t58.f58 = t57.f57
+LEFT JOIN t59
+ON t36.f36 = t59.f59
+LEFT JOIN v60
+ON t36.f36 = v60.f60
+;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+2	SUBQUERY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	no matching row in const table
+drop table t0, t1, t2, t3, t4, t5, t6, t7, t8, t9,
+t10, t11, t12, t13, t14, t15, t16, t17, t18,
+t19, t20, t21, t22, t23, t24, t25, t26, t27,
+t28, t29, t30, t31, t32, t33, t34, t35, t36,
+t37, t38, t39, t40, t41, t42, t43, t44, t45,
+t46, t47, t48, t49, t50, t51, t52, t53, t54,
+t55, t56, t57, t58, t59,t60;
+drop view v60;
 # -----------------------------------------------------------------
 # -- End of 5.5 tests.
 # -----------------------------------------------------------------
diff --git a/mysql-test/t/view.test b/mysql-test/t/view.test
index 4b3537df2de..835f12957d4 100644
--- a/mysql-test/t/view.test
+++ b/mysql-test/t/view.test
@@ -5478,6 +5478,202 @@ SHOW CREATE VIEW v1;
 drop view v1;
 drop table t1;
 
+CREATE TABLE IF NOT EXISTS t0 (f0 INT);
+CREATE TABLE IF NOT EXISTS t1 (f1 INT);
+CREATE TABLE IF NOT EXISTS t2 (f2 INT);
+CREATE TABLE IF NOT EXISTS t3 (f3 INT);
+CREATE TABLE IF NOT EXISTS t4 (f4 INT);
+CREATE TABLE IF NOT EXISTS t5 (f5 INT);
+CREATE TABLE IF NOT EXISTS t6 (f6 INT);
+CREATE TABLE IF NOT EXISTS t7 (f7 INT);
+CREATE TABLE IF NOT EXISTS t8 (f8 INT);
+CREATE TABLE IF NOT EXISTS t9 (f9 INT);
+CREATE TABLE IF NOT EXISTS t10 (f10 INT);
+CREATE TABLE IF NOT EXISTS t11 (f11 INT);
+CREATE TABLE IF NOT EXISTS t12 (f12 INT);
+CREATE TABLE IF NOT EXISTS t13 (f13 INT);
+CREATE TABLE IF NOT EXISTS t14 (f14 INT);
+CREATE TABLE IF NOT EXISTS t15 (f15 INT);
+CREATE TABLE IF NOT EXISTS t16 (f16 INT);
+CREATE TABLE IF NOT EXISTS t17 (f17 INT);
+CREATE TABLE IF NOT EXISTS t18 (f18 INT);
+CREATE TABLE IF NOT EXISTS t19 (f19 INT);
+CREATE TABLE IF NOT EXISTS t20 (f20 INT);
+CREATE TABLE IF NOT EXISTS t21 (f21 INT);
+CREATE TABLE IF NOT EXISTS t22 (f22 INT);
+CREATE TABLE IF NOT EXISTS t23 (f23 INT);
+CREATE TABLE IF NOT EXISTS t24 (f24 INT);
+CREATE TABLE IF NOT EXISTS t25 (f25 INT);
+CREATE TABLE IF NOT EXISTS t26 (f26 INT);
+CREATE TABLE IF NOT EXISTS t27 (f27 INT);
+CREATE TABLE IF NOT EXISTS t28 (f28 INT);
+CREATE TABLE IF NOT EXISTS t29 (f29 INT);
+CREATE TABLE IF NOT EXISTS t30 (f30 INT);
+CREATE TABLE IF NOT EXISTS t31 (f31 INT);
+CREATE TABLE IF NOT EXISTS t32 (f32 INT);
+CREATE TABLE IF NOT EXISTS t33 (f33 INT);
+CREATE TABLE IF NOT EXISTS t34 (f34 INT);
+CREATE TABLE IF NOT EXISTS t35 (f35 INT);
+CREATE TABLE IF NOT EXISTS t36 (f36 INT);
+CREATE TABLE IF NOT EXISTS t37 (f37 INT);
+CREATE TABLE IF NOT EXISTS t38 (f38 INT);
+CREATE TABLE IF NOT EXISTS t39 (f39 INT);
+CREATE TABLE IF NOT EXISTS t40 (f40 INT);
+CREATE TABLE IF NOT EXISTS t41 (f41 INT);
+CREATE TABLE IF NOT EXISTS t42 (f42 INT);
+CREATE TABLE IF NOT EXISTS t43 (f43 INT);
+CREATE TABLE IF NOT EXISTS t44 (f44 INT);
+CREATE TABLE IF NOT EXISTS t45 (f45 INT);
+CREATE TABLE IF NOT EXISTS t46 (f46 INT);
+CREATE TABLE IF NOT EXISTS t47 (f47 INT);
+CREATE TABLE IF NOT EXISTS t48 (f48 INT);
+CREATE TABLE IF NOT EXISTS t49 (f49 INT);
+CREATE TABLE IF NOT EXISTS t50 (f50 INT);
+CREATE TABLE IF NOT EXISTS t51 (f51 INT);
+CREATE TABLE IF NOT EXISTS t52 (f52 INT);
+CREATE TABLE IF NOT EXISTS t53 (f53 INT);
+CREATE TABLE IF NOT EXISTS t54 (f54 INT);
+CREATE TABLE IF NOT EXISTS t55 (f55 INT);
+CREATE TABLE IF NOT EXISTS t56 (f56 INT);
+CREATE TABLE IF NOT EXISTS t57 (f57 INT);
+CREATE TABLE IF NOT EXISTS t58 (f58 INT);
+CREATE TABLE IF NOT EXISTS t59 (f59 INT);
+CREATE TABLE IF NOT EXISTS t60 (f60 INT);
+CREATE OR REPLACE VIEW v60 AS SELECT * FROM t60;
+
+EXPLAIN
+ SELECT t0.*
+FROM t0
+JOIN t1
+    ON t1.f1 = t0.f0
+LEFT JOIN t2
+    ON t0.f0 = t2.f2
+LEFT JOIN t3
+    ON t0.f0 = t3.f3
+LEFT JOIN t4
+    ON t0.f0 = t4.f4
+LEFT JOIN t5
+    ON t4.f4 = t5.f5
+LEFT JOIN t6
+    ON t0.f0 = t6.f6
+LEFT JOIN t7
+    ON t0.f0 = t7.f7
+LEFT JOIN t8
+    ON t0.f0 = t8.f8
+LEFT JOIN t9
+    ON t0.f0 = t9.f9
+LEFT JOIN t10
+    ON t0.f0 = t10.f10
+LEFT JOIN t11
+    ON t0.f0 = t11.f11
+LEFT JOIN t12
+    ON t0.f0 = t12.f12
+LEFT JOIN t13
+    ON t0.f0 = t13.f13
+LEFT JOIN t14
+    ON t0.f0 = t14.f14
+LEFT JOIN t15
+    ON t0.f0 = t15.f15
+LEFT JOIN t16
+    ON t0.f0 = t16.f16
+LEFT JOIN t17
+    ON t0.f0 = t17.f17
+LEFT JOIN t18
+    ON t0.f0 = t18.f18
+LEFT JOIN t19
+    ON t18.f18 = t19.f19
+LEFT JOIN t20
+    ON t20.f20 = t19.f19
+LEFT JOIN t21
+    ON t20.f20 = t21.f21
+LEFT JOIN t22
+    ON t19.f19 = t22.f22
+LEFT JOIN t23
+    ON t23.f23 = t0.f0
+LEFT JOIN t24
+    ON t24.f24 = t23.f23
+LEFT JOIN t25
+    ON t0.f0 = t25.f25
+LEFT JOIN t26
+    ON t26.f26 = t0.f0
+LEFT JOIN t27
+    ON t27.f27 = t0.f0
+LEFT JOIN t28
+    ON t0.f0 = t28.f28
+LEFT JOIN t29
+    ON t0.f0 = t29.f29
+LEFT JOIN t30
+    ON t30.f30 = t0.f0
+LEFT JOIN t31
+    ON t0.f0 = t31.f31
+LEFT JOIN t32
+    ON t32.f32 = t31.f31
+LEFT JOIN t33
+    ON t33.f33 = t0.f0
+LEFT JOIN t34
+    ON t33.f33 = t34.f34
+LEFT JOIN t35
+    ON t33.f33 = t35.f35
+LEFT JOIN t36
+    ON t36.f36 = t0.f0
+LEFT JOIN t37
+    ON t32.f32 = t37.f37
+LEFT JOIN t38
+    ON t31.f31 = t38.f38
+LEFT JOIN t39
+    ON t39.f39 = t0.f0
+LEFT JOIN t40
+    ON t40.f40 = t39.f39
+LEFT JOIN t41
+    ON t41.f41 = t0.f0
+LEFT JOIN t42
+    ON t42.f42 = t41.f41
+LEFT JOIN t43
+    ON t43.f43 = t41.f41
+LEFT JOIN t44
+    ON t44.f44 = t0.f0
+LEFT JOIN t45
+    ON t45.f45 = t0.f0
+LEFT JOIN t46
+    ON t46.f46 = t0.f0
+LEFT JOIN t47
+    ON t47.f47 = t0.f0
+LEFT JOIN t48
+    ON t48.f48 = t0.f0
+LEFT JOIN t49
+    ON t0.f0 = t49.f49
+LEFT JOIN t50
+    ON t0.f0 = t50.f50
+LEFT JOIN t51
+    ON t0.f0 = t51.f51
+LEFT JOIN t52
+    ON t52.f52 = t0.f0
+LEFT JOIN t53
+    ON t53.f53 = t0.f0
+LEFT JOIN t54
+    ON t54.f54 = t0.f0
+LEFT JOIN t55
+    ON t55.f55 = t0.f0
+LEFT JOIN t56
+    ON t56.f56 = t0.f0
+LEFT JOIN t57
+    ON t57.f57 = t0.f0
+LEFT JOIN t58
+    ON t58.f58 = t57.f57
+LEFT JOIN t59
+    ON t36.f36 = t59.f59
+LEFT JOIN v60
+    ON t36.f36 = v60.f60
+;
+drop table t0, t1, t2, t3, t4, t5, t6, t7, t8, t9,
+t10, t11, t12, t13, t14, t15, t16, t17, t18,
+t19, t20, t21, t22, t23, t24, t25, t26, t27,
+t28, t29, t30, t31, t32, t33, t34, t35, t36,
+t37, t38, t39, t40, t41, t42, t43, t44, t45,
+t46, t47, t48, t49, t50, t51, t52, t53, t54,
+t55, t56, t57, t58, t59,t60;
+drop view v60;
+
 --echo # -----------------------------------------------------------------
 --echo # -- End of 5.5 tests.
 --echo # -----------------------------------------------------------------
diff --git a/sql/table.h b/sql/table.h
index 98f8c7ad73f..fcf214d3582 100644
--- a/sql/table.h
+++ b/sql/table.h
@@ -2125,6 +2125,7 @@ struct TABLE_LIST
     DBUG_PRINT("enter", ("Alias: '%s'  Unit: %p",
                         (alias ? alias : "<NULL>"),
                          get_unit()));
+    derived= get_unit();
     derived_type= ((derived_type & (derived ? DTYPE_MASK : DTYPE_VIEW)) |
                    DTYPE_TABLE | DTYPE_MATERIALIZE);
     set_check_materialized();