Issue #1331056 by thekevinday, robertwb, steinmb, DamienMcKenna, joseph.olstad, chamilsanjeewa, Proteo, dawehner, steverweber, hubScrappy, tim.plunkett, colan, acbramley, stevector, merlinofchaos, sylus, seanB, scott.whittaker, matheushamonangan, drmabuse_, bellerophons_pegasus: Regression: Improper use of GROUP BY statement produces ambiguous column error.