Paul Rogers

Failed again in [this build](https://app.travis-ci.com/github/apache/druid/jobs/573847615).

Failed again in [this build](https://app.travis-ci.com/github/apache/druid/jobs/576754236).

@abhishekagarwal87, thanks for the fix! Really excited to see another source of error removed. The changes look straight-forward enough. However, it is not clear to this newbie what they're trying...

Looked into the issues. There are several. Upshot: we cannot upgrade to this version: Avatica itself needs some fixes. We may have compatibility issues when older Avatica clients talk with...

Thanks much for making this fix. An impressive amount of code is deleted in this PR! I wonder, will this fix the many issues with [`PrefetchableTextFilesFirehoseFactoryTest`](https://github.com/apache/druid/issues/12638)? It seems that one...

We also had an offline discussion about `MultiPhaseParallelIndexingRowStatsTest`, which failed in one of my PRs. I see that the base class, `AbstractMultiPhaseParallelIndexingTest`, is adjusted in this PR, but `MultiPhaseParallelIndexingRowStatsTest` is...

LGTM (non-binding) Would love to see this gets merged as this will unblock PRs that are failing builds due to the tests which this PR fixes.

@petermarshallio, thanks for the improvements! LGTM (non-binding)

Let's add additional design details as notes to keep the description light. ## Security The catalog is implemented as another table in Druid's metastore DB. Operations are via the REST...

@FrankChen021, thanks for your encouragement! Yes, I hope that borrowing a bit of RDBMS functionality we can make Druid a bit easier to use by letting Druid keep track of...