Fix a JNI bug in JSON parsing fixup #15550
Merged
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Description
When parsing JSON in the current code if no columns can be parsed out of the data, then an empty table is returned. Earlier we put in a work around to this so that we could pass in the number of rows needed and the JSON parsing code would make a table of null values for it. This had some issues with structs and lists which needed an extended way to produce the null scalar. This adds in code to do just that.
Checklist