我有一个包含大量行的mysql表。我有一个查询，计算每一列的sum（）。我用极限偏移量来分开。我需要使用javaexecutorservice线程池并行处理这些部分。最后，从每个部分得到所有的和值，并为每个列加上它们。
让select语句像这样。

select sum(principal_amount) as total_principal_amount, sum(interest_amount) as total_interest_amount from X limit 1000 offset 0.

select sum(principal_amount) as total_principal_amount, sum(interest_amount) as total_interest_amount from X limit 1000 offset 1000.

select sum(principal_amount) as total_principal_amount, sum(interest_amount) as total_interest_amount from X limit 1000 offset 2000.