本文详细解析了QuerySpec内的appendGroupBy方法，包括其参数意义、使用场景及示例，帮助开发者掌握如何在SQL查询中高效地添加分组条件。
QuerySpec里面的appendGroupBy方法的使用appendGroupBy(ColumnExpression a_column, int[] a_fromIndicies, boolean a_appendSelect)
Appends the column expression to the GROUP BY clause.Parameters:
Appends the column expression to the GROUP BY clause.Parameters:
a_column - object to append a_fromIndicies - array of ordinal index values into the QuerySpec's FromClause that reference TableExpressions used by the ColumnExpression a_appendSelect - Indicates if the ColumnExpression should be appended to the SELECT clause also.
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