Hi Dave,
The issue is not in joining, Drill can join empty schemaless table (for
example empty JSON file or empty directory).
DRILL-4517 is exactly describes the issue. You can add your test case with
data to that jira ticket.
Regarding workarounds, I am not aware of any.
Kind regards
Vitalii
We've got some processes that dump some reporting data as a bunch of
parquet files, then runs queries involving joins with those tables (i.e. we
have a main table which is always non-empty, then a number of link tables
which join against which can be empty).
The Parquet files contain schema
