Support ZOrder in OSS

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Support ZOrder in OSS

Chang Chen
Hi All 

I found that impala already implemented Zorder (

I used to think supporting zorder needed file format support, but from the impala implementation, it looks like  only needing to implement a new RecordComparator which is independent with File format.

I know that DRB already supports it in 2018, I believe  this feature is useful for improving query performance in certain cases.  

Would it be possible to port the zorder implementation  from DBR to open source spark?