Protect against high-cardinality map keys that needs to be transposed

[vearutop]

Random strings (tokens, uuids, etc...) used as keys of JSON objects can lead to unbounded growth of keys dictionary (and memory). They can also lead to unbounded width of the resulting table, which would obviously be impractical for analysis.

It would be great to detect such key segments and denormalize (into transposed tables) them to improve both memory usage and analysis convenience.