MDEV-28117 Multiple conflicting table COLLATE clauses are not rejected

This problem was earlier fixed by the patch for MDEV-27896.

Now adding only MTR tests from the report.

mysql-test/main/ctype_collate_database.result

@@ -104,3 +104,8 @@ DEFAULT_CHARACTER_SET_NAME	DEFAULT_COLLATION_NAME
 utf8mb4	utf8mb4_bin
 DROP DATABASE db1;
 DROP VIEW cscl;
+#
+# MDEV-28117 Multiple conflicting table COLLATE clauses are not rejected
+#
+CREATE DATABASE db1 COLLATE latin1_swedish_ci COLLATE latin1_bin;
+ERROR HY000: Conflicting declarations: 'COLLATE latin1_swedish_ci' and 'COLLATE latin1_bin'

mysql-test/main/ctype_collate_database.test

@@ -94,3 +94,11 @@ SELECT * FROM cscl;
 DROP DATABASE db1;
 
 DROP VIEW cscl;
+
+
+--echo #
+--echo # MDEV-28117 Multiple conflicting table COLLATE clauses are not rejected
+--echo #
+
+--error ER_CONFLICTING_DECLARATIONS
+CREATE DATABASE db1 COLLATE latin1_swedish_ci COLLATE latin1_bin;

mysql-test/main/ctype_collate_table.result

@@ -25,3 +25,8 @@ t1	CREATE TABLE `t1` (
   `a` char(10) DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4
 DROP TABLE t1;
+#
+# MDEV-28117 Multiple conflicting table COLLATE clauses are not rejected
+#
+CREATE TABLE t1 (a CHAR(10)) COLLATE latin1_swedish_ci COLLATE latin1_bin;
+ERROR HY000: Conflicting declarations: 'COLLATE latin1_swedish_ci' and 'COLLATE latin1_bin'

mysql-test/main/ctype_collate_table.test

@@ -20,3 +20,10 @@ DROP TABLE t1;
 CREATE TABLE t1 (a CHAR(10)) CHARACTER SET utf8mb4 COLLATE DEFAULT;
 SHOW CREATE TABLE t1;
 DROP TABLE t1;
+
+--echo #
+--echo # MDEV-28117 Multiple conflicting table COLLATE clauses are not rejected
+--echo #
+
+--error ER_CONFLICTING_DECLARATIONS
+CREATE TABLE t1 (a CHAR(10)) COLLATE latin1_swedish_ci COLLATE latin1_bin;