Github user MaxGekk commented on the issue: https://github.com/apache/spark/pull/21439 Thank you @maropu for your review of the PR. > better to add tests in json-functions.sql? What kind of tests would you expect in `json-functions.sql`. Probably you would expect tests that are different from added to `JsonExpressionsSuite.scala`. > Can we also accept primitive arrays in to_json? I believe it should be implemented in another PR because the changes required for `to_json` don't intersect with this PR.
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