DataTable求列的最大值、最小值、平均值和样本数

与sql聚合函数相似，会屏蔽null

table.Compute("max(ColumnName)", "true");
table.Compute("min(ColumnName)", "true");
table.Compute("avg(ColumnName)", "true");
table.Compute("count(ColumnName)", "true");

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