[GitHub] [incubator-iceberg] waterlx edited a comment on issue #317: Extend Iceberg metadata with SortOrder

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waterlx edited a comment on issue #317: Extend Iceberg metadata with SortOrder
URL: https://github.com/apache/incubator-iceberg/issues/317#issuecomment-544417172
 
 
   Hi @aokolnychyi are you still working on the PR?
   By the way, regarding 
   > Sort orders might evolve and change over time. When this happens, existing files will not be rewritten. Query engines should follow the updated sort order during subsequent writes. As a result, files within a table or partition can be sorted differently at a given point in time.
   
   In terms of "changing sort order", do we only support adding new sort order, while it is prohibited to change existing sort orders (especially when they are tied by some data files)?
   If it is allowed to change an existing sort order, we could run into problems when visiting the old data files tied to it, right?  
   

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