Test case:

SET SESSION optimizer_switch = 'index_merge=off,index_merge_union=off,index_merge_sort_union=off,index_merge_intersection=off,index_condition_pushdown=off,firstmatch=off,loosescan=off,materialization=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=on,table_elimination=off';

--disable_warnings
DROP TABLE /*! IF EXISTS */ CC;
DROP TABLE /*! IF EXISTS */ C;
--enable_warnings

CREATE TABLE `CC` (
  `pk` int(11) NOT NULL AUTO_INCREMENT,
  `col_int_nokey` int(11) DEFAULT NULL,
  `col_int_key` int(11) DEFAULT NULL,
  `col_varchar_key` varchar(1) DEFAULT NULL,
  `col_varchar_nokey` varchar(1) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `col_int_key` (`col_int_key`),
  KEY `col_varchar_key` (`col_varchar_key`,`col_int_key`)
) ENGINE=MARIA AUTO_INCREMENT=30 DEFAULT CHARSET=latin1 PAGE_CHECKSUM=1;
INSERT INTO `CC` VALUES (10,7,8,'v','v');
INSERT INTO `CC` VALUES (11,1,9,'r','r');
INSERT INTO `CC` VALUES (12,5,9,'a','a');
INSERT INTO `CC` VALUES (13,3,186,'m','m');
INSERT INTO `CC` VALUES (14,6,NULL,'y','y');
INSERT INTO `CC` VALUES (15,92,2,'j','j');
INSERT INTO `CC` VALUES (16,7,3,'d','d');
INSERT INTO `CC` VALUES (17,NULL,0,'z','z');
INSERT INTO `CC` VALUES (18,3,133,'e','e');
INSERT INTO `CC` VALUES (19,5,1,'h','h');
INSERT INTO `CC` VALUES (20,1,8,'b','b');
INSERT INTO `CC` VALUES (21,2,5,'s','s');
INSERT INTO `CC` VALUES (22,NULL,5,'e','e');
INSERT INTO `CC` VALUES (23,1,8,'j','j');
INSERT INTO `CC` VALUES (24,0,6,'e','e');
INSERT INTO `CC` VALUES (25,210,51,'f','f');
INSERT INTO `CC` VALUES (26,8,4,'v','v');
INSERT INTO `CC` VALUES (27,7,7,'x','x');
INSERT INTO `CC` VALUES (28,5,6,'m','m');
INSERT INTO `CC` VALUES (29,NULL,4,'c','c');
CREATE TABLE `C` (
  `pk` int(11) NOT NULL AUTO_INCREMENT,
  `col_int_nokey` int(11) DEFAULT NULL,
  `col_int_key` int(11) DEFAULT NULL,
  `col_varchar_key` varchar(1) DEFAULT NULL,
  `col_varchar_nokey` varchar(1) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `col_int_key` (`col_int_key`),
  KEY `col_varchar_key` (`col_varchar_key`,`col_int_key`)
) ENGINE=MARIA AUTO_INCREMENT=21 DEFAULT CHARSET=latin1 PAGE_CHECKSUM=1;
INSERT INTO `C` VALUES (1,NULL,2,'w','w');
INSERT INTO `C` VALUES (2,7,9,'m','m');
INSERT INTO `C` VALUES (3,9,3,'m','m');
INSERT INTO `C` VALUES (4,7,9,'k','k');
INSERT INTO `C` VALUES (5,4,NULL,'r','r');
INSERT INTO `C` VALUES (6,2,9,'t','t');
INSERT INTO `C` VALUES (7,6,3,'j','j');
INSERT INTO `C` VALUES (8,8,8,'u','u');
INSERT INTO `C` VALUES (9,NULL,8,'h','h');
INSERT INTO `C` VALUES (10,5,53,'o','o');
INSERT INTO `C` VALUES (11,NULL,0,NULL,NULL);
INSERT INTO `C` VALUES (12,6,5,'k','k');
INSERT INTO `C` VALUES (13,188,166,'e','e');
INSERT INTO `C` VALUES (14,2,3,'n','n');
INSERT INTO `C` VALUES (15,1,0,'t','t');
INSERT INTO `C` VALUES (16,1,1,'c','c');
INSERT INTO `C` VALUES (17,0,9,'m','m');
INSERT INTO `C` VALUES (18,9,5,'y','y');
INSERT INTO `C` VALUES (19,NULL,6,'f','f');
INSERT INTO `C` VALUES (20,4,2,'d','d');

CREATE VIEW view_C AS SELECT * FROM C;

SELECT table1 .`col_varchar_nokey`
FROM C table1  RIGHT  JOIN CC  LEFT  JOIN (
SELECT SUBQUERY1_t2 .*
FROM CC SUBQUERY1_t1  LEFT  JOIN C SUBQUERY1_t2  ON SUBQUERY1_t2 .`col_int_key`  = SUBQUERY1_t1 .`col_int_nokey`  ) table3  STRAIGHT_JOIN ( (
SELECT *
FROM CC  ) table4  JOIN ( CC table5  JOIN C table6  ON table5 .`pk`  )  ON table5 .`col_varchar_nokey`  )  ON table6 .`pk`  = table5 .`col_int_key`  ON table5 .`col_varchar_nokey`  ON table5 .`col_varchar_key`
WHERE table3 .`col_varchar_key`  IN (
SELECT `col_varchar_key`
FROM view_C  )  AND table1 .`col_varchar_key`  OR table1 .`pk`   ;