blockcache计算有问题

[chejinge]

Is this a regression?

Yes

Description

Please provide a link to a minimal reproduction of the bug

No response

Screenshots or videos

两个Columnfamily算了两遍，share-block-cache为yes的情况下，这个值就算重复了。
pika的bug。

Please provide the version you discovered this bug in (check about page for version information)

v3.5.5

Anything else?

两个Columnfamily算了两遍，share-block-cache为yes的情况下，这个值就算重复了。
pika的bug。

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Title: There is something wrong with blockcache calculation