apache / apache/hugegraph

使用HBase做后端存储,graph名称无法使用大写字母

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improvement
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Description

### Expected behavior 期望表现
{type something here...}
在HBase中,可以按照配置文件的实际内容创建NameSpace作为Graph的名称。

### Actual behavior 实际表现
{type something here...}
执行init-store.sh脚本,即使配置文件中的graph是大写,也会被转换成小写。

### Steps to reproduce the problem 复现步骤
在源码中可以看到
hugegraph-master
model:hugegraph-hbase
package:com.baidu.hugegraph.backend.store.hbase
HbaseStoreProvider.java 第29行,使用了toLowerCase()函数,把graph转为小写了。

### Status of loaded data 数据状态

#### Vertex/Edge summary 数据量
- loaded vertices amount: {like 10 million}
- loaded edges amount: {like 20 million}
- loaded time: {like 200s}

#### Vertex/Edge example 数据示例
{type something here...}

#### Schema(VertexLabel, EdgeLabel, IndexLabel) 元数据结构
{type something here...}

### Specifications of environment 环境信息
- hugegraph version: {like v0.7.4}
- operating system: {like centos 7.4, 32 CPUs, 64G RAM}
- hugegraph backend: {like cassandra 3.10, cluster with 20 nodes, 3 x 1TB HDD disk each node}

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