MDEV-33788 HEX(COLUMN_CREATE(.. AS CHAR ...)) fails with --view-protocol

Item_func_dyncol_create::print_arguments() printed only CHARSET clause
without COLLATE.

Therefore,

HEX(column_create(1,'1212' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_bin))

inside a VIEW changed to just:

HEX(column_create(1,'1212' AS CHAR CHARACTER SET utf8mb3))

which changed the collation ID seen in the HEX output.

Note, the collation ID inside column_create() is not really much important.
(It's only important what the character set is).
And for COLLATE, the more important thing is what's later written
in the AS clause of COLUMN_GET:

SELECT
   COLUMN_GET(
    column_create(1,'1212' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_bin)
    column_nr AS type  -- this type is more important
   );

Still, let's add the COLLATE clause into the COLUMN_CREATE() print output,
although it's not important for now for anything else than just the HEX output.
At least to make VIEW work in a more predictable way with HEX(COLUMN_CREATE()).

Also, in the future we can start using somehow the collation ID written inside
COLUMN_CREATE(), for example by making the `AS type` clause optional in
COLUMN_GET():
  COLUMN_GET(dyncol_blob, column_nr [AS type]);
instead of:
  COLUMN_GET(dyncol_blob, column_nr AS type);

SQL Server compatibility layer may need this for
the SQL_Variant data type support.

mysql-test/main/create.result

@@ -1806,7 +1806,7 @@ show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `color` char(32) GENERATED ALWAYS AS (column_get(`dynamic_cols`,1 as char charset latin1)) STORED,
-  `cl` char(32) GENERATED ALWAYS AS (column_get(column_add(column_create(1,'blue' AS char charset latin1 ),2,'ttt'),`i` as char charset latin1)) STORED,
+  `cl` char(32) GENERATED ALWAYS AS (column_get(column_add(column_create(1,'blue' AS char charset latin1 collate latin1_swedish_ci ),2,'ttt'),`i` as char charset latin1)) STORED,
   `item_name` varchar(32) NOT NULL,
   `i` int(11) DEFAULT NULL,
   `dynamic_cols` blob DEFAULT NULL,

mysql-test/main/dyncol.result

@@ -150,7 +150,7 @@ select hex(COLUMN_CREATE(1, "afaf" AS char character set utf8,
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select hex(column_create(1,'afaf' AS char charset utf8 ,2,1212 AS unsigned int,3,1212 AS int,4,12.12 AS double,4 + 1,12.12 AS decimal,6,'2011-04-05' AS date,7,'- 0:45:49.000001' AS time,8,'2011-04-05 0:45:49.000001' AS datetime)) AS `ex`
+Note	1003	select hex(column_create(1,'afaf' AS char charset utf8 collate utf8_general_ci ,2,1212 AS unsigned int,3,1212 AS int,4,12.12 AS double,4 + 1,12.12 AS decimal,6,'2011-04-05' AS date,7,'- 0:45:49.000001' AS time,8,'2011-04-05 0:45:49.000001' AS datetime)) AS `ex`
 select hex(column_create(1, 0.0 AS decimal));
 hex(column_create(1, 0.0 AS decimal))
 000100010004
@@ -354,7 +354,7 @@ select column_get(column_create(1, "1212" AS char charset utf8), 1 as char chars
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select column_get(column_create(1,'1212' AS char charset utf8 ),1 as char charset utf8) AS `ex`
+Note	1003	select column_get(column_create(1,'1212' AS char charset utf8 collate utf8_general_ci ),1 as char charset utf8) AS `ex`
 select column_get(column_create(1, 1212 AS unsigned int), 1 as char charset utf8) as ex;
 ex
 1212
@@ -414,7 +414,7 @@ select column_get(column_create(1, "1212" AS char charset utf8), 1 as char chars
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select column_get(column_create(1,'1212' AS char charset utf8 ),1 as char charset binary) AS `ex`
+Note	1003	select column_get(column_create(1,'1212' AS char charset utf8 collate utf8_general_ci ),1 as char charset binary) AS `ex`
 #
 # column get real
 #
@@ -1882,7 +1882,7 @@ drop table t1;
 create view v1 as select column_get(column_add(column_create(1 , 'blue' as char), 2, 'ttt'), 1 as char);
 show create view v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select column_get(column_add(column_create(1,'blue' AS char charset utf8 ),2,'ttt'),1 as char charset utf8) AS `Name_exp_1`	utf8	utf8_general_ci
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select column_get(column_add(column_create(1,'blue' AS char charset utf8 collate utf8_general_ci ),2,'ttt'),1 as char charset utf8) AS `Name_exp_1`	utf8	utf8_general_ci
 select * from v1;
 Name_exp_1
 blue
@@ -1949,3 +1949,23 @@ ex
 #
 # End of 10.4 tests
 #
+#
+# Start of 10.5 tests
+#
+#
+# Start of 10.5 tests
+#
+#
+# MDEV-33788 HEX(COLUMN_CREATE(.. AS CHAR ...)) fails with --view-protocol
+#
+SELECT hex(column_create(1,'a' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_bin)) AS ex;
+ex
+0001000100035361
+SELECT hex(column_add(column_create(
+1, 'a' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_bin),
+2, 'b' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci)) AS ex;
+ex
+00020001000302001353612162
+#
+# Start of 10.5 tests
+#

mysql-test/main/dyncol.test

@@ -1000,3 +1000,24 @@ SELECT HEX(COLUMN_ADD(COLUMN_CREATE(1,10),2,NULL,1,NULL)) as ex;
 --echo #
 --echo # End of 10.4 tests
 --echo #
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-33788 HEX(COLUMN_CREATE(.. AS CHAR ...)) fails with --view-protocol
+--echo #
+
+SELECT hex(column_create(1,'a' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_bin)) AS ex;
+SELECT hex(column_add(column_create(
+                      1, 'a' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_bin),
+                      2, 'b' AS CHAR CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci)) AS ex;
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #

sql/item_strfunc.cc

@@ -4670,6 +4670,11 @@ void Item_func_dyncol_create::print_arguments(String *str,
       {
         str->append(STRING_WITH_LEN(" charset "));
         str->append(defs[i].cs->csname);
+        if (Charset(defs[i].cs).can_have_collate_clause())
+       {
+          str->append(STRING_WITH_LEN(" collate "));
+          str->append(defs[i].cs->name);
+        }
         str->append(' ');
       }
       break;