add snapshot check and retry (baidu#159)

Performance Improvements (baidu#156)

DeleteFilesInRange before DeleteRange (baidu#94)

* fix cstore bugs and primary decode bug

* DeleteFilesInRange before DeleteRange

fix bug count(distinct field) (baidu#87)

* fix bug count(distinct field)

* braft update to v1.1.1

* brpc update to 0.9.7

* fix bug mem row

Co-authored-by: liguoqiang <liguoqiang@MacintoshdeMacBook-Pro.local>

rocksdb 6.8.1 (baidu#86)

Co-authored-by: liguoqiang <liguoqiang@MacintoshdeMacBook-Pro.local>

transaction compatible (baidu#84)

* transaction compatible

* rocksdb to v6.8.1

* fix compile

* fix compile

* fix compile

* fix compile

Co-authored-by: liguoqiang <liguoqiang@MacintoshdeMacBook-Pro.local>

修复like前缀匹配路由问题，修复pb解析大数据包问题 (baidu#79)

* sst backup interface

* fix type infer

* fix like router; fix bigdata

Co-authored-by: liguoqiang <liguoqiang@MacintoshdeMacBook-Pro.local>

fix type infer (baidu#75)

* sst backup interface

* fix type infer

Co-authored-by: liguoqiang <liguoqiang@MacintoshdeMacBook-Pro.local>