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Antoine PitrouMicah Kornfield
c3b972c8f70
Antoine Pitrou authored and Micah Kornfield committed 3121a8df114
ARROW-11483: [C++] Write integration JSON files compatible with the Java reader

The Java reader for JSON integration files uses an inflexible parsing technique where an empty "children" member in record batches is forbidden.

It's probably easier to make the C++ side produce compatible files, rather than fix the Java parser to be more tolerant.

Also, fix an issue where data values of null entries in numeric arrays were quoted.

Closes #9405 from pitrou/ARROW-11483-write-java-compatible-json

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>