Over a 24 hour or so period, Daniel Abadi, Dmitriy Ryaboy and Randolph Pullen all remarked on MySQL’s lack of hash joins. (It relies on nested loops instead, which were state-of-the-art technology around the time of the Boris Yeltsin administration.) This led me to wonder — why is this not a problem for Infobright?
Per Infobright chief scientist Dominik Slezak, the answer is
Infobright perform joins using its own optimization/execution layers (that actually include hash join algorithms and advanced knowledge-grid-based nested loop optimizations in particular).