MDEV-19951 followup: Remove unused st_handler_tablename, tablename_compare

storage/innobase/handler/ha_innodb.cc

@@ -15189,24 +15189,6 @@ struct table_list_item {
 	const char*		name;
 };
 
-/** Structure to compare two st_tablename objects using their
-db and tablename. It is used in the ordering of cascade_fk_set.
-It returns true if the first argument precedes the second argument
-and false otherwise. */
-struct tablename_compare {
-
-	bool operator()(const st_handler_tablename lhs,
-			const st_handler_tablename rhs) const
-	{
-		int cmp = strcmp(lhs.db, rhs.db);
-		if (cmp == 0) {
-			cmp = strcmp(lhs.tablename, rhs.tablename);
-		}
-
-		return(cmp < 0);
-	}
-};
-
 /*****************************************************************//**
 Checks if ALTER TABLE may change the storage engine of the table.
 Changing storage engines is not allowed for tables for which there

storage/innobase/handler/ha_innodb.h

@@ -51,12 +51,7 @@ struct ha_table_option_struct
 	uint		encryption;		/*!<  DEFAULT, ON, OFF */
 	ulonglong	encryption_key_id;	/*!< encryption key id  */
 };
-/* JAN: TODO: MySQL 5.7 handler.h */
-struct st_handler_tablename
-{
-  const char *db;
-  const char *tablename;
-};
+
 /** The class defining a handle to an Innodb table */
 class ha_innobase final: public handler
 {