MDEV-18358: Server crash when using SET STATEMENT max_statement_time

Do not init lex before choosing main select.

mysql-test/main/set_statement.result

@@ -1231,4 +1231,14 @@ SET STATEMENT myisam_sort_buffer_size=800000 FOR OPTIMIZE TABLE t;
 Table	Op	Msg_type	Msg_text
 test.t	optimize	status	Table is already up to date
 SET sql_mode=default;
+SET STATEMENT myisam_sort_buffer_size=800000 FOR OPTIMIZE TABLE t;
+Table	Op	Msg_type	Msg_text
+test.t	optimize	status	Table is already up to date
 drop table t;
+#
+# MDEV-18358: Server crash when using SET STATEMENT max_statement_time
+#
+SET sql_mode=ORACLE;
+SET STATEMENT max_statement_time=30 FOR DELETE FROM mysql.user where user = 'unknown';
+SET sql_mode=default;
+SET STATEMENT max_statement_time=30 FOR DELETE FROM mysql.user where user = 'unknown';

mysql-test/main/set_statement.test

@@ -1135,5 +1135,14 @@ create table t (a int);
 SET sql_mode=ORACLE;
 SET STATEMENT myisam_sort_buffer_size=800000 FOR OPTIMIZE TABLE t;
 SET sql_mode=default;
+SET STATEMENT myisam_sort_buffer_size=800000 FOR OPTIMIZE TABLE t;
 drop table t;
 
+
+--echo #
+--echo # MDEV-18358: Server crash when using SET STATEMENT max_statement_time
+--echo #
+SET sql_mode=ORACLE;
+SET STATEMENT max_statement_time=30 FOR DELETE FROM mysql.user where user = 'unknown';
+SET sql_mode=default;
+SET STATEMENT max_statement_time=30 FOR DELETE FROM mysql.user where user = 'unknown';

sql/sql_yacc.yy

@@ -13679,12 +13679,11 @@ delete:
           {
             LEX *lex= Lex;
             lex->sql_command= SQLCOM_DELETE;
-            mysql_init_select(lex);
             YYPS->m_lock_type= TL_WRITE_DEFAULT;
             YYPS->m_mdl_type= MDL_SHARED_WRITE;
             if (Lex->main_select_push())
               MYSQL_YYABORT;
-
+            mysql_init_select(lex);
             lex->ignore= 0;
             lex->first_select_lex()->order_list.empty();
           }

sql/sql_yacc_ora.yy

@@ -13792,12 +13792,11 @@ delete:
           {
             LEX *lex= Lex;
             lex->sql_command= SQLCOM_DELETE;
-            mysql_init_select(lex);
             YYPS->m_lock_type= TL_WRITE_DEFAULT;
             YYPS->m_mdl_type= MDL_SHARED_WRITE;
             if (Lex->main_select_push())
               MYSQL_YYABORT;
-
+            mysql_init_select(lex);
             lex->ignore= 0;
             lex->first_select_lex()->order_list.empty();
           }