flink-json does not support map type

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flink-json does not support map type

Benchao Li
Hi devs,

Recently when we use blink-planner with flink-json format, we found that
flink-json does not support `map` type well. Actually flink-json treat
`map` type as normal object, which means its type is deduced from
fast-jackson, not from ddl.

I have created a jira: FLINK-14546 to track this.
I'm appreciated if any committer could help confirm this problem, and
assign to ticket to me.

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Benchao Li
School of Electronics Engineering and Computer Science, Peking University
Tel:+86-15650713730
Email: [hidden email]; [hidden email]