MDEV-7971: Assertion `name != __null' failed in ACL_internal_schema_registry::lookup...

[Attempt #] Make the code that handles "Prepare" phase for multi-table
UPDATE statements handle non-merged semijoins. It can encounter them when
a prepared statement is executed for the second time.

mysql-test/r/subselect_mat.result

@@ -2197,6 +2197,24 @@ Handler_read_rnd_next	6003
 Handler_tmp_write	2000
 Handler_write	1000
 drop table t0,t1,t2,t3;
+#
+# MDEV-7971: Assertion `name != __null' failed in ACL_internal_schema_registry::lookup 
+#            on 2nd execution os PS with multi-table update
+#
+CREATE TABLE t1 (f1 INT);
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2 (f2 INT);
+INSERT INTO t2 VALUES (3),(4);
+CREATE TABLE t3 (f3 INT);
+INSERT INTO t3 VALUES (5),(6);
+PREPARE stmt FROM '
+  UPDATE t1, t2 
+  SET f1 = 5
+  WHERE 8 IN ( SELECT MIN(f3) FROM t3 )
+';
+EXECUTE stmt;
+EXECUTE stmt;
+DROP TABLE t1,t2,t3;
 set @subselect_mat_test_optimizer_switch_value=null;
 set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off';
 set optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';

mysql-test/r/subselect_sj_mat.result

@@ -2237,3 +2237,21 @@ Handler_read_rnd_next	6003
 Handler_tmp_write	2000
 Handler_write	1000
 drop table t0,t1,t2,t3;
+#
+# MDEV-7971: Assertion `name != __null' failed in ACL_internal_schema_registry::lookup 
+#            on 2nd execution os PS with multi-table update
+#
+CREATE TABLE t1 (f1 INT);
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2 (f2 INT);
+INSERT INTO t2 VALUES (3),(4);
+CREATE TABLE t3 (f3 INT);
+INSERT INTO t3 VALUES (5),(6);
+PREPARE stmt FROM '
+  UPDATE t1, t2 
+  SET f1 = 5
+  WHERE 8 IN ( SELECT MIN(f3) FROM t3 )
+';
+EXECUTE stmt;
+EXECUTE stmt;
+DROP TABLE t1,t2,t3;

mysql-test/t/subselect_sj_mat.test

@@ -1885,3 +1885,28 @@ select * from t1 where (a,b) in (select max(a),b from t2 group by b);
 show status where Variable_name like 'Handler_read%' or  Variable_name like 'Handler_%write%';
 
 drop table t0,t1,t2,t3;
+
+--echo #
+--echo # MDEV-7971: Assertion `name != __null' failed in ACL_internal_schema_registry::lookup 
+--echo #            on 2nd execution os PS with multi-table update
+--echo #
+CREATE TABLE t1 (f1 INT);
+INSERT INTO t1 VALUES (1),(2);
+
+CREATE TABLE t2 (f2 INT);
+INSERT INTO t2 VALUES (3),(4);
+
+CREATE TABLE t3 (f3 INT);
+INSERT INTO t3 VALUES (5),(6);
+
+PREPARE stmt FROM '
+  UPDATE t1, t2 
+  SET f1 = 5
+  WHERE 8 IN ( SELECT MIN(f3) FROM t3 )
+';
+
+EXECUTE stmt;
+EXECUTE stmt;
+
+DROP TABLE t1,t2,t3;
+

sql/sql_parse.cc

@@ -7749,6 +7749,8 @@ bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
   */
   for (table= tables; table; table= table->next_local)
   {
+    if (table->is_jtbm())
+      continue;
     if (table->derived)
       table->grant.privilege= SELECT_ACL;
     else if ((check_access(thd, UPDATE_ACL, table->db,

sql/sql_update.cc

@@ -1161,7 +1161,7 @@ bool unsafe_key_update(List<TABLE_LIST> leaves, table_map tables_for_update)
 
   while ((tl= it++))
   {
-    if (tl->table->map & tables_for_update)
+    if (!tl->is_jtbm() && (tl->table->map & tables_for_update))
     {
       TABLE *table1= tl->table;
       bool primkey_clustered= (table1->file->primary_key_is_clustered() &&
@@ -1178,6 +1178,8 @@ bool unsafe_key_update(List<TABLE_LIST> leaves, table_map tables_for_update)
       it2.rewind();
       while ((tl2= it2++))
       {
+        if (tl2->is_jtbm())
+          continue;
         /*
           Look at "next" tables only since all previous tables have
           already been checked
@@ -1409,6 +1411,9 @@ int mysql_multi_update_prepare(THD *thd)
   {
     TABLE *table= tl->table;
 
+    if (tl->is_jtbm())
+      continue;
+
     /* if table will be updated then check that it is unique */
     if (table->map & tables_for_update)
     {
@@ -1457,6 +1462,8 @@ int mysql_multi_update_prepare(THD *thd)
   for (tl= table_list; tl; tl= tl->next_local)
   {
     bool not_used= false;
+    if (tl->is_jtbm())
+      continue;
     if (multi_update_check_table_access(thd, tl, tables_for_update, &not_used))
       DBUG_RETURN(TRUE);
   }
@@ -1464,6 +1471,8 @@ int mysql_multi_update_prepare(THD *thd)
   /* check single table update for view compound from several tables */
   for (tl= table_list; tl; tl= tl->next_local)
   {
+    if (tl->is_jtbm())
+      continue;
     if (tl->is_merged_derived())
     {
       TABLE_LIST *for_update= 0;
@@ -1493,6 +1502,8 @@ int mysql_multi_update_prepare(THD *thd)
   ti.rewind();
   while ((tl= ti++))
   {
+    if (tl->is_jtbm())
+      continue;
     TABLE *table= tl->table;
     TABLE_LIST *tlist;
     if (!(tlist= tl->top_table())->derived)
@@ -1635,6 +1646,9 @@ int multi_update::prepare(List<Item> &not_used_values,
   */
   while ((table_ref= ti++))
   {
+    if (table_ref->is_jtbm())
+      continue;
+
     TABLE *table= table_ref->table;
     if (tables_to_update & table->map)
     {
@@ -1654,6 +1668,9 @@ int multi_update::prepare(List<Item> &not_used_values,
   ti.rewind();
   while ((table_ref= ti++))
   {
+    if (table_ref->is_jtbm())
+      continue;
+
     TABLE *table= table_ref->table;
     if (tables_to_update & table->map)
     {
@@ -1684,6 +1701,8 @@ int multi_update::prepare(List<Item> &not_used_values,
   while ((table_ref= ti++))
   {
     /* TODO: add support of view of join support */
+    if (table_ref->is_jtbm())
+      continue;
     TABLE *table=table_ref->table;
     leaf_table_count++;
     if (tables_to_update & table->map)