Author: Thomas Tauber-Marshall <email@example.com>
Date: Thu May 4 13:51:08 2017 -0700
IMPALA-5120: Default to partitioned join when stats are missing
Previously, we defaulted to broadcast join when stats were
missing, but this can lead to disastrous plans when the
right hand side is actually large.
Its always difficult to make good plans when stats are missing,
but defaulting to partitioned joins should reduce the risk of
- Added a planner test that joins a table with no stats.
Reviewed-by: Thomas Tauber-Marshall <firstname.lastname@example.org>
Tested-by: Impala Public Jenkins