[jira] [Created] (FLINK-14649) Flatten all the connector properties keys to make it easy to configure in DDL

["Jark Wu (Jira)" <ji...@apache.org>]

Jark Wu created FLINK-14649:
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             Summary: Flatten all the connector properties keys to make it easy to configure in DDL
                 Key: FLINK-14649
                 URL: https://issues.apache.org/jira/browse/FLINK-14649
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Jark Wu


There are some connector properties are lists. For example, Kafka connector specific properties have to been set in the following way:


{code}
 'connector.properties.0.key' = 'zookeeper.connect',
  'connector.properties.0.value' = 'localhost:2181',
  'connector.properties.1.key' = 'bootstrap.servers',
  'connector.properties.1.value' = 'localhost:9092',
  'connector.properties.2.key' = 'group.id',
  'connector.properties.2.value' = 'testGroup',
{code}

It woule be better to flatten the properties for user friendly, for example: 

{code}
 'connector.zookeeper.connect' = 'localhost:2181',
  'connector.bootstrap.servers' = 'localhost:9092',
  'connector.group.id' = 'testGroup',
{code}




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