clintropolis opened a new issue, #14339:
URL: https://github.com/apache/druid/issues/14339
### Affected Version
26.0.0+
### Description
'json' columns improperly classify this column as a `STRING` type, which
results in scan queries being broken (e.g `select * from table`) with errors of
the form:
```Cannot coerce [java.util.LinkedHashMap] to VARCHAR```
'auto' columns consider this case incorrectly as `null`, and so will write
out a null column instead of preserving the empty objects, which is incorrect,
though there is likely very low use for preserving them, it does change the
original data, which is counter the purpose of 'auto'.
Both of these cases should instead recognize that the empty object is a
'nested' structure and consider the type `COMPLEX<json>`.
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