示例

该示例展示了一个经典的业务流水线，维度表来自 Hive，每天通过批处理流水线作业或 Flink 作业更新一次，kafka流来自实时在线业务数据或日志，需要与维度表联接以扩充流。

1. 使用spark sql 创建 hive obs 外表，并插入数据。

   CREATE TABLE if not exists dimension_hive_table (
     product_id STRING,
     product_name STRING,
     unit_price DECIMAL(10, 4),
     pv_count BIGINT,
     like_count BIGINT,
     comment_count BIGINT,
     update_time TIMESTAMP,
     update_user STRING
   ) 
   STORED AS PARQUET 
   LOCATION 'obs://demo/spark.db/dimension_hive_table' 
   PARTITIONED BY (
       create_time   STRING
   );

   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_11', 'product_name_11', 1.2345, 100, 50, 20, '2023-11-25 02:10:58', 'update_user_1');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_12', 'product_name_12', 2.3456, 200, 100, 40, '2023-11-25 02:10:58', 'update_user_2');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_13', 'product_name_13', 3.4567, 300, 150, 60, '2023-11-25 02:10:58', 'update_user_3');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_14', 'product_name_14', 4.5678, 400, 200, 80, '2023-11-25 02:10:58', 'update_user_4');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_15', 'product_name_15', 5.6789, 500, 250, 100, '2023-11-25 02:10:58', 'update_user_5');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_16', 'product_name_16', 6.7890, 600, 300, 120, '2023-11-25 02:10:58', 'update_user_6');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_17', 'product_name_17', 7.8901, 700, 350, 140, '2023-11-25 02:10:58', 'update_user_7');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_18', 'product_name_18', 8.9012, 800, 400, 160, '2023-11-25 02:10:58', 'update_user_8');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_19', 'product_name_19', 9.0123, 900, 450, 180, '2023-11-25 02:10:58', 'update_user_9');
   INSERT INTO dimension_hive_table PARTITION (create_time='create_time_1') VALUES ('product_id_10', 'product_name_10', 10.1234, 1000, 500, 200, '2023-11-25 02:10:58', 'update_user_10');

2. 参考创建Flink OpenSource作业，创建flink opensource sql作业，输入以下作业脚本，并提交运行。该作业模拟从kafka读取数据，并关联hive维表对数据进行打宽，并输出到print。
   如下脚本中的加粗参数请根据实际环境修改。

   CREATE CATALOG myhive WITH (
       'type' = 'hive' ,
       'default-database' = 'demo',
        'hive-conf-dir' = '/opt/flink/conf'
   );
   
   USE CATALOG myhive;
   
   CREATE TABLE if not exists ordersSource (
     product_id STRING,
     user_name string,
     proctime as Proctime()
   ) WITH (
     'connector' = 'kafka',
     'topic' = 'TOPIC',
     'properties.bootstrap.servers' = 'KafkaIP:PROT,KafkaIP:PROT,KafkaIP:PROT',
     'properties.group.id' = 'GroupId',
     'scan.startup.mode' = 'latest-offset',
     'format' = 'json'
   );
   
   create table if not exists print (
     product_id STRING,
     user_name string,
     product_name STRING,
     unit_price DECIMAL(10, 4),
     pv_count BIGINT,
     like_count BIGINT,
     comment_count BIGINT,
     update_time TIMESTAMP,
     update_user STRING,
     create_time   STRING
   ) with (
     'connector' = 'print'
   );
   
   insert into print 
   select 
     orders.product_id,
     orders.user_name,
     dim.product_name,
     dim.unit_price,
     dim.pv_count,
     dim.like_count,
     dim.comment_count,
     dim.update_time,
     dim.update_user,
     dim.create_time
   from ordersSource orders
   left join dimension_hive_table /*+ OPTIONS('lookup.join.cache.ttl'='60 m') */
      for system_time as of orders.proctime as dim on orders.product_id = dim.product_id;

3. 连接Kafka集群，向Kafka的source topic中插入如下测试数据：

   {"product_id": "product_id_11", "user_name": "name11"}
   {"product_id": "product_id_12", "user_name": "name12"}

4. 查看print结果表数据。

   +I[product_id_11, name11, product_name_11, 1.2345, 100, 50, 20, 2023-11-24T18:10:58, update_user_1, create_time_1]
   +I[product_id_12, name12, product_name_12, 2.3456, 200, 100, 40, 2023-11-24T18:10:58, update_user_2, create_time_1]