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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2021/09/14 13:55:22 UTC

[GitHub] [flink] Airblader edited a comment on pull request #17186: [FLINK-16203][table] Support JSON_OBJECT()

Airblader edited a comment on pull request #17186:
URL: https://github.com/apache/flink/pull/17186#issuecomment-919139597


   There is one interesting point still:
   
   ```
   -- '{"A":{"K":"V"}}'
   JSON_OBJECT('A' VALUE JSON_OBJECT('K' VALUE 'V'))
   
   -- '{"A":"{\"K\":\"V\"},\"EXPR$0\":1}'
   JSON_OBJECT('A' VALUE JSON_OBJECT('K' VALUE 'V'), 'B' VALUE ROW(1))
   ```
   
   When one of the arguments is of type `ROW`, it seems that the RexCalls are replaced by RexLiterals, breaking the logic to nest JSON calls. I'm not yet sure why that happens.
   
   Edit: The problem is ReduceExpressionsRule. We have to make this function non-deterministic since the result depends on the context and not purely on the operands.


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