gianm opened a new pull request, #13544:
URL: https://github.com/apache/druid/pull/13544

   Currently we use Guava 16.0.2. This is a very old version, but we continue 
to use it in order to maintain compatibility with Hadoop 2, which also bundles 
a very old version of Guava. As a community we have not yet made the decision 
to drop support for Hadoop 2 
(https://lists.apache.org/thread/1j5w9dmt1gp8hx31tvrmyomcko4mlp03), but 
nevertheless, we'd like to update Calcite 
(https://github.com/apache/druid/issues/13532). Current versions of Calcite 
support a minimum of Guava 19.0, so this patch updates us to that version. 
We'll need to test it with Hadoop 2 to make sure nothing breaks.


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