DBZ-5201 Debezium does NOT support unix_timestamp() as DEFAULT value

debezium-ddl-parser/src/main/antlr4/io/debezium/ddl/parser/mysql/generated/MySqlParser.g4

@@ -2263,6 +2263,7 @@ defaultValue
     | '(' expression ')'
     | (LASTVAL | NEXTVAL) '(' fullId ')' // MariaDB
     | '(' (PREVIOUS | NEXT) VALUE FOR fullId ')' // MariaDB
+    | expression // MariaDB
     ;
 
 currentTimestamp

debezium-ddl-parser/src/test/resources/mysql/examples/ddl_create.sql

@@ -138,6 +138,7 @@ UNIQUE KEY `UN_member_id` (`member_id`) USING BTREE,
 UNIQUE KEY `UN_product_no` (`product_no`) USING BTREE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci ROW_FORMAT=DYNAMIC;
 
+CREATE TABLE `table_default_fn`(`quote_id` varchar(32) NOT NULL,`created_at` bigint(20) NOT NULL DEFAULT unix_timestamp());
 #end
 #begin
 -- Rename table