修改kafka输出格式，适配starrocks

[Lxuty]

Bifrost针对kafka插件输出格式，做了一定的变化，主要是只保存更新后的数据，去掉DDL语句与COMMIT语句，让StarRocks Routine可以识别消费。

MySQL原表：
CREATE TABLE a (
id int(11) NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4

StarRocks主键表创建及routine示例：
CREATE TABLE a(
id int NOT NULL
) PRIMARY KEY (id)
DISTRIBUTED BY HASH(id) BUCKETS 32
PROPERTIES('replication_num' = '1');

--必须要先创建一个kafka topic才可以
create routine load routine_a on a
COLUMNS TERMINATED BY ",",
COLUMNS(id,EventType, __op=case when EventType="insert" then 0 when EventType="update" then 0 when EventType="delete" then 1 else null end) PROPERTIES
(
"format" = "json",
"jsonpaths"= "["$.Rows[0].id","$.EventType"]",
"desired_concurrent_number"="1",
"strict_mode" = "false",
"strip_outer_array" ="false",
"max_error_number" = "1000"
)
FROM KAFKA
(
"kafka_broker_list" = "xxx.xxx.xxx.xxx:9092",
"kafka_topic" = "a",
"kafka_partitions" = "0",
"kafka_offsets" = "OFFSET_BEGINNING"
);

[jc3wish]

当前輸出到kafka,支持以一个json map的方式输出了

同时已经 以mysql协议连接starrocks 同步 ,并且 支持自动建表等功能