costEstimator.addHybridHashCosts(SMALL_ESTIMATES, SMALL_ESTIMATES, hashBothSmall, 1);
costEstimator.addHybridHashCosts(BIG_ESTIMATES, BIG_ESTIMATES, hashBothLarge, 1);
assertTrue(hashBothSmall.compareTo(hashSmallBuild) < 0);
assertTrue(hashSmallBuild.compareTo(hashLargeBuild) < 0);
assertTrue(hashLargeBuild.compareTo(hashBothLarge) < 0);
// merge join costs
Costs mergeBothSmall = new Costs();
Costs mergeBothLarge = new Costs();