iiibui

[Question]Why luajit feature not support memory_limit

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Related code: https://github.com/khvzak/mlua/blob/cfb5d3fd45a810e5cde6811b039d154241d1444c/src/lua.rs#L332-L399 `fn allocator` include luajit feature, but it is not used when new lua state.

The variable 'cf_opts' is not used by 'DB::open_cf'

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https://github.com/tikv/rust-rocksdb/blob/d8b7ff8aee62aa9a406b64f7093049d62eeb9a1a/tests/cases/test_rocksdb_options.rs#L345-L374 `DB::open_cf(opts, path.path().to_str().unwrap(), vec!["default"]).unwrap();` why not `DB::open_cf(opts, path.path().to_str().unwrap(), vec![("default", cf_opts)]).unwrap();`

[doc improve]How to import data from multiple tables in mysql into one tag/edge

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**nebula-exchange version** v2.6 As title, after some google I found this https://stackoverflow.com/questions/49130381/instead-of-fetching-multiple-tables-using-pyspark-how-can-we-execute-join-query, but [here](https://github.com/vesoft-inc/nebula-exchange/blob/d8ae3e341413fc403e9db5a51911c93c55b8c15c/nebula-exchange/src/main/scala/com/vesoft/nebula/exchange/reader/ServerBaseReader.scala#L93-L94) needs to be modified, and when I editing this issue I found this modification is same...

The storage leader address for the partition of metaManager cache does not look correct

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对应代码：https://github.com/vesoft-inc/nebula-java/blob/3518faa8444c1f590fba92d7f7c66946ad696852/client/src/main/java/com/vesoft/nebula/client/meta/MetaManager.java#L114 GetPartsAllocReq返回的分区信息无法确定哪个host是leader吧？代码取了第一个，对比 ListHosts 返回的 LeaderParts，第一个并不是 Leader Host。我是参考这里的 https://github.com/vesoft-inc/nebula-common/blob/master/src/common/clients/meta/MetaClient.cpp#L3189 另外 StorageClient 目前只有 scanXXX 接口，有无计划补全剩下的接口？