[Feature] support reverse order in range index
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feature
- Dominant language
- Java
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- 3d 11h
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- 14
Description
## Feature Description:
`RangeIndex` 目前从小到大升序, 后续可支持**降序**排序 (例如用于查找时间最近添加的)
_PS: sortkey may have same case_
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