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This adds support to fetch the list of function names within a database, and then to fetch the list of overloads for a given function name. These items are cached on the coordinator and invalidated when minimal function objects are seen on the minimal catalog topic stream. Aside from the straight-forward plumbing of this new RPC, it's worth noting that this patch changes the MetaProvider interface to provide Impala Functions directly instead of HMS Function objects. This means that we will now fully support all the types of functions supported in legacy catalogs. As such, test_udfs now passes. Making this change simplified the code in LocalDb but also means that DirectMetaProvider no longer supports fetching functions. When we move to trying to eliminate catalogd altogether at some point, we can revive this code. For now, I just throw an exception for the function-related code in DirectMetaProvider, as it's unused. The one other notable thing here is that TFunction now has optional fields where it used to have required ones. This was necessary in order to send invalidations as TCatalogObjects. Given that TFunction is an internal-only construct, this shouldn't raise compatibility issues. Change-Id: Ifef8ece9f214dca9441833b00f65c7c152d0ab53 Reviewed-on: http://gerrit.cloudera.org:8080/11359 Reviewed-by: Todd Lipcon <todd@apache.org> Tested-by: Todd Lipcon <todd@apache.org>