[jira] [Created] (FLINK-28723) Support json format to serialize the MapData when its key is not STRING

["Shengkai Fang (Jira)" <ji...@apache.org>]

Shengkai Fang created FLINK-28723:
-------------------------------------

             Summary: Support json format to serialize the MapData when its key is not STRING 
                 Key: FLINK-28723
                 URL: https://issues.apache.org/jira/browse/FLINK-28723
             Project: Flink
          Issue Type: Sub-task
          Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
            Reporter: Shengkai Fang


Currently, the JSON format only supports serializing the Map when its key is STRING. We may convert the key to a JSON string. For example, we can convert the `MAP<ARRAY<INT>, ARRAY<INT>>` to the following string.
{code:java}
{
  "[1, 2, 3]": [
    1,
    2,
    3
  ]
}
{code}



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