Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18645
I believe the last errors were essentially the same issue discussed in
json4s here:
https://github.com/json4s/json4s/issues/227
I suspect that it's down to a change in the effective setting of Jackson
when reading or writing JSON:
https://fasterxml.github.io/jackson-databind/javadoc/2.7/com/fasterxml/jackson/databind/DeserializationFeature.html#ACCEPT_SINGLE_VALUE_AS_ARRAY
or
https://fasterxml.github.io/jackson-databind/javadoc/2.7/com/fasterxml/jackson/databind/SerializationFeature.html#WRITE_SINGLE_ELEM_ARRAYS_UNWRAPPED
It doesn't look like the value's defaults changed from Jackson 2.6 to 2.7,
and don't see it overridden in json4s, though it did see some changes in 3.3
that cause it to ignore some Jackson defaults.
In any event I thought it safer to handle both scenarios in the tests where
they matter. Let's see if that works, first.
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