fixed issue #1636

[wangsaner]

非flat模式，当MQ主题为多分区时，数据拆分只取了for循环里面的最后一份数据，
导致消费端只能消费到一个分区的数据

[CLAassistant]

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[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[agapple]

tks