Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/2098
Few things are left. Thus i'v just changed to WIP again. Sorry for
confusing.
- adding more `transformation.method` for columnar and drill-down charts:
`array:key`, `array:group`, `array:drilldown`
- fixing bugs.
The final output will be served with 2 examples
1. column charts including drill-down functionality
2. pie charts including drill-down functionality
Let me mention again after then :)
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