[Enhancement] count_distinct make column prune failed when nereid is disabled

[hqx871]

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Description

I have read the AggregateInfo and get that count_distinct make column prune failed, but I would like to know how count_distinct will affect the aggregating exprs materialized

   /**
     * Mark slots required for this aggregation as materialized:
     * - all grouping output slots as well as grouping exprs
     * - for non-distinct aggregation: the aggregate exprs of materialized aggregate slots;
     *   this assumes that the output slots corresponding to aggregate exprs have already
     *   been marked by the consumer of this select block
     * - for distinct aggregation, we mark all aggregate output slots in order to keep
     *   things simple
     * Also computes materializedAggregateExprs.
     * This call must be idempotent because it may be called more than once for Union stmt.
     */

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