Github user julianhyde commented on the issue:
https://github.com/apache/drill/pull/1012
If I recall correctly -- we went through this because Calcite uses ESRI --
the only change was to remove org.json. It's a pretty important change because
org.json is not compatible with Apache license. And I think org.json data
structures were used in the API (e.g. as arguments and method return values) so
obsoleting it would be an API change.---
