Kafka-Source Csv格式下，多字符支持

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
java
Domain
stream-processing

Research direction

Start by tracing the Kafka-Source CSV path that uses Flink's CsvRowDeserializationSchema and the jackson-dataformat-csv API. Confirm how the current single-character delimiter is configured, then define completion as successfully parsing Kafka CSV messages with a multi-character delimiter.

Written by the indexing model from the issue text.

Description

目前，Kafka-Source插件csv数据格式，用于读取kafka消息，使用的是flink官方的CsvRowDeserializationSchema（调用jackson-dataformat-csv的API进行解析），只支持单字符分隔符。是否考虑添加多字符分隔符。这个应该很实用！！！

Dominant language
Java
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