Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19492
In fact I don't feel strong preference to support array of primitive types
in `from_json`.
The reason is that I think at most time, we will use json object instead of
json array at top-level. Is it common to use json array to store primitive type
of data like this? Seems to me it doesn't have more advantage than just a
string with special delimiter such as "," or "|".
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