(csv) Allow specifying custom String placeholder to use when a POJO would serialize as `Object` about jackson-dataformats-text HOT 3 OPEN

On possible implementation: due to the way databinding/streaming API separation works, it is not (at least currently) possible to figure out potential problem before attempt is made to write structure that would be an Object at dataformat level.

However, I think the idea that in absence of other functionality to "flatten" Objects (like, "any properties", or nested/dotted notation) there should be a placeholder to use instead makes sense.

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What about the idea of support dot notation in the schema?

CsvSchema schema = CsvSchema.builder()
        .addColumn("person.firstName")
        .addColumn("person.firstName")
        .addColumn("person.age", CsvSchema.ColumnType.NUMBER)
        .build();

Could that work for writing CSV?

Any code pointers to places to investigate/test further would be appreciated

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Apologies I can see issue #9 is the place for this discussion

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