MDEV-20730: Syntax error on SELECT INTO @variable with CTE

added forgotem WITH option to spacial case with INTO

mysql-test/main/cte_nonrecursive.result

@@ -1673,3 +1673,14 @@ with columns as (select 1 as t) select * from columns;
 t
 1
 use test;
+#
+# MDEV-20730: Syntax error on SELECT INTO @variable with CTE
+#
+with data as (select 1 as id)
+select id into @myid from data;
+set @save_sql_mode = @@sql_mode;
+set sql_mode="oracle";
+with data as (select 1 as id)
+select id into @myid from data;
+set sql_mode= @save_sql_mode;
+# End of 10.4 tests

mysql-test/main/cte_nonrecursive.test

@@ -1182,3 +1182,18 @@ with t as (select 1 as t) select * from t;
 with columns as (select 1 as t) select * from columns;
 
 use test;
+
+
+--echo #
+--echo # MDEV-20730: Syntax error on SELECT INTO @variable with CTE
+--echo #
+
+with data as (select 1 as id)
+select id into @myid from data;
+set @save_sql_mode = @@sql_mode;
+set sql_mode="oracle";
+with data as (select 1 as id)
+select id into @myid from data;
+set sql_mode= @save_sql_mode;
+
+--echo # End of 10.4 tests

sql/sql_yacc.yy

@@ -9213,6 +9213,24 @@ select_into:
             if (Lex->select_finalize(unit))
               MYSQL_YYABORT;
           }
+        | with_clause
+          select_into_query_specification
+          {
+            if (Lex->push_select($2))
+              MYSQL_YYABORT;
+          }
+          opt_order_limit_lock
+          {
+            SELECT_LEX_UNIT *unit;
+            if (!(unit  = Lex->create_unit($2)))
+              MYSQL_YYABORT;
+            if ($4)
+              unit= Lex->add_tail_to_query_expression_body(unit, $4);
+            unit->set_with_clause($1);
+            $1->attach_to($2);
+            if (Lex->select_finalize(unit))
+              MYSQL_YYABORT;
+          }
         ;
 
 simple_table:

sql/sql_yacc_ora.yy

@@ -9314,6 +9314,24 @@ select_into:
             if (Lex->select_finalize(unit))
               MYSQL_YYABORT;
            }
+        | with_clause
+          select_into_query_specification
+          {
+            if (Lex->push_select($2))
+              MYSQL_YYABORT;
+          }
+          opt_order_limit_lock
+          {
+            SELECT_LEX_UNIT *unit;
+            if (!(unit  = Lex->create_unit($2)))
+              MYSQL_YYABORT;
+            if ($4)
+              unit= Lex->add_tail_to_query_expression_body(unit, $4);
+            unit->set_with_clause($1);
+            $1->attach_to($2);
+            if (Lex->select_finalize(unit))
+              MYSQL_YYABORT;
+          }
          ;