MDEV-8114: server crash on updates with joins still on 10.0.18

Check that leaf table list is really built before storing it.

mysql-test/r/update_innodb.result

+CREATE TABLE `t1` (
+`c1` int(11) NOT NULL,
+`c2` datetime DEFAULT NULL,
+PRIMARY KEY (`c1`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+CREATE TABLE `t2` (
+`c0` varchar(10) NOT NULL,
+`c1` int(11) NOT NULL,
+`c2` int(11) NOT NULL,
+PRIMARY KEY (`c0`,`c1`),
+KEY `c1` (`c1`),
+KEY `c2` (`c2`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+CREATE TABLE `t3` (
+`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+`c1` datetime NOT NULL,
+`c2` bigint(20) NOT NULL,
+`c3` int(4) unsigned NOT NULL,
+PRIMARY KEY (`id`),
+KEY `c2` (`c2`),
+KEY `c3` (`c3`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+CREATE TABLE `t4` (
+`c1` int(11) NOT NULL,
+`c2` bigint(20) DEFAULT NULL,
+`c3` int(11) NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+CREATE ALGORITHM=UNDEFINED VIEW `v1` AS select `t4`.`c1` AS `c1`,`t4`.`c2` AS `c2`,`t4`.`c3` AS `c3` from `t4`;
+UPDATE t1 a JOIN t2 b ON a.c1 = b.c1 JOIN v1 vw ON b.c2 = vw.c1 JOIN t3 del ON vw.c2 = del.c2 SET a.c2 = ( SELECT max(t.c1) FROM t3 t, v1 i WHERE del.c2 = t.c2 AND vw.c3 = i.c3 AND t.c3 = 4 ) WHERE a.c2 IS NULL OR a.c2 < '2011-05-01';
+drop view v1;
+drop table t1,t2,t3,t4;

mysql-test/t/update_innodb.test

+--source include/have_innodb.inc
+
+CREATE TABLE `t1` (
+  `c1` int(11) NOT NULL,
+  `c2` datetime DEFAULT NULL,
+  PRIMARY KEY (`c1`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+CREATE TABLE `t2` (
+  `c0` varchar(10) NOT NULL,
+  `c1` int(11) NOT NULL,
+  `c2` int(11) NOT NULL,
+  PRIMARY KEY (`c0`,`c1`),
+  KEY `c1` (`c1`),
+  KEY `c2` (`c2`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+CREATE TABLE `t3` (
+  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `c1` datetime NOT NULL,
+  `c2` bigint(20) NOT NULL,
+  `c3` int(4) unsigned NOT NULL,
+  PRIMARY KEY (`id`),
+  KEY `c2` (`c2`),
+  KEY `c3` (`c3`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+CREATE TABLE `t4` (
+  `c1` int(11) NOT NULL,
+  `c2` bigint(20) DEFAULT NULL,
+  `c3` int(11) NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+ CREATE ALGORITHM=UNDEFINED VIEW `v1` AS select `t4`.`c1` AS `c1`,`t4`.`c2` AS `c2`,`t4`.`c3` AS `c3` from `t4`;
+
+UPDATE t1 a JOIN t2 b ON a.c1 = b.c1 JOIN v1 vw ON b.c2 = vw.c1 JOIN t3 del ON vw.c2 = del.c2 SET a.c2 = ( SELECT max(t.c1) FROM t3 t, v1 i WHERE del.c2 = t.c2 AND vw.c3 = i.c3 AND t.c3 = 4 ) WHERE a.c2 IS NULL OR a.c2 < '2011-05-01';
+
+drop view v1;
+drop table t1,t2,t3,t4;

sql/sql_base.cc

@@ -8291,9 +8291,10 @@ bool setup_tables(THD *thd, Name_resolution_context *context,
   if (select_lex->first_cond_optimization)
   {
     leaves.empty();
-    if (!select_lex->is_prep_leaf_list_saved)
+    if (select_lex->prep_leaf_list_state != SELECT_LEX::SAVED)
     {
       make_leaves_list(leaves, tables, full_table_list, first_select_table);
+      select_lex->prep_leaf_list_state= SELECT_LEX::READY;
       select_lex->leaf_tables_exec.empty();
     }
     else

sql/sql_lex.cc

@@ -1882,7 +1882,7 @@ void st_select_lex::init_query()
   exclude_from_table_unique_test= no_wrap_view_item= FALSE;
   nest_level= 0;
   link_next= 0;
-  is_prep_leaf_list_saved= FALSE;
+  prep_leaf_list_state= UNINIT;
   bzero((char*) expr_cache_may_be_used, sizeof(expr_cache_may_be_used));
   m_non_agg_field_used= false;
   m_agg_func_used= false;
@@ -4129,12 +4129,22 @@ bool st_select_lex::save_prep_leaf_tables(THD *thd)
 {
   List_iterator_fast<TABLE_LIST> li(leaf_tables);
   TABLE_LIST *table;
+
+  /*
+    Check that the SELECT_LEX was really prepared and so tables are setup.
+
+    It can be subquery in SET clause of UPDATE which was not prepared yet, so
+    its tables are not yet setup and ready for storing.
+  */
+  if (prep_leaf_list_state != READY)
+    return FALSE;
+
   while ((table= li++))
   {
     if (leaf_tables_prep.push_back(table))
       return TRUE;
   }
-  is_prep_leaf_list_saved= TRUE;
+  prep_leaf_list_state= SAVED;
   for (SELECT_LEX_UNIT *u= first_inner_unit(); u; u= u->next_unit())
   {
     for (SELECT_LEX *sl= u->first_select(); sl; sl= sl->next_select())

sql/sql_lex.h

@@ -789,7 +789,8 @@ class st_select_lex: public st_select_lex_node
   List<TABLE_LIST> leaf_tables;
   List<TABLE_LIST> leaf_tables_exec;
   List<TABLE_LIST> leaf_tables_prep;
-  bool is_prep_leaf_list_saved;
+  enum leaf_list_state {UNINIT, READY, SAVED};
+  enum leaf_list_state prep_leaf_list_state;
   uint insert_tables;
   st_select_lex *merged_into; /* select which this select is merged into */
                               /* (not 0 only for views/derived tables)   */