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Question: why is ErrInvalidConn returned for all network read error?

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Reading the code(https://github.com/go-sql-driver/mysql/blob/master/packets.go#L39), all network read errors are replaced by ErrInvalidConn. Can we distinguish read/write timeout from other errors? Is there a reason for the design here? PS: sometime, we...

opt: tikvStatefulSetIsUpgrading check against tikv sts UpdateRevision

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### What problem does this PR solve? In some cases, the tikvMemberManager of tidb-operator may regard the tikv as `upgrading` when the corresponding STS is creating. For example, if the...

# 相关issues #68 #42 # 修正内容 1. 修正获取用户关注话题数bug 2. 修正获取用户关注话题，数组下标越界bug(PS: 起因由 1 引起)

1. use string instead the original type of extra data 2. update dependencies