[BAHIR-226] flink-connector-redis RedisMapper supports varargs by returning List<T> type in `getValueFromData` function

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Flink Streaming Connectors
• Labels: flink flink-redis-connector
• Environment: Java8, flink1.10, flink-redis-sink-connector 1.1.5
• Assignee: Unassigned
• Reporter: sam lin
• Created: 05/Mar/20 01:26
• Updated: 05/Mar/20 01:26

Description

Jedis can support varargs that takes multiple arguments to take the same operations. e.g. [SADD](https://redis.io/commands/sadd).  In Jedis code: https://github.com/xetorthio/jedis/blob/master/src/main/java/redis/clients/jedis/Jedis.java#L1212

I think whether we could support this feature in sink connector?  This will be very useful in terms of performance and flexiblity.

Didn't dive deep into implementation, but for interface wise, `RedisMapper::getValueFromData()` could return List<T>?  Or a new Mapper.