@twalthr You're right, ReduceExpressionRule.CALC should add to logical opt phase, but I tried it and it result to java.lang.OutOfMemoryError when I test `testReduceDeterministicUDF`. I believe the calc rules (`FilterCalcMergeRule, ProjectCalcMergeRule, FilterToCalcRule, ProjectToCalcRule, CalcMergeRule`) interact with each other. If adding a new phase after, there's only calc node, the search space is quite small than in logical opt phase. I think adding phase is necessary as the number of rule increasing.
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