sum和avg函数，不加别名不执行merger，加了空指针异常 #19

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sum和avg函数，不加别名不执行merger，加了空指针异常#19

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AccumulationAggregationUnit和AvgAggregationUnit类的doMerger函数的入参在查询结果为空的时候，为null，需要加非空判断

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