Merge remote-tracking branch 'shagalla/10.3-mdev12172' into 10.3

As a result of this merge the code for the following tasks appears in 10.3:
- MDEV-12172 Implement tables specified by table value constructors
- MDEV-12176 Transform [NOT] IN predicate with long list of values INTO
             [NOT] IN subquery.

sql/sql_priv.h

@@ -352,6 +352,8 @@ enum enum_parsing_place
   IN_ON,
   IN_GROUP_BY,
   IN_ORDER_BY,
+  IN_UPDATE_ON_DUP_KEY,
+  IN_PART_FUNC,
   PARSING_PLACE_SIZE /* always should be the last */
 };