[GitHub] [incubator-iceberg] rdblue commented on issue #360: Spec: Add column equality delete files

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rdblue commented on issue #360: Spec: Add column equality delete files
URL: https://github.com/apache/incubator-iceberg/issues/360#issuecomment-610075049
 
 
   @openinx, what is the motivating use case for a format like that one?
   
   The use cases that we've been considering for equality deletes mostly have a stable column set that will be used for deletes. For example, a CDC use case typically uses the primary key of the table that is changing. In that case, it's easier if the schema of the delete file is a data file with just the primary key columns. So if I had a `users` table, I might have a delete file with a single column, `user_id` with a field ID that matches the data files.
   
   What are the use cases for a format that allows a dynamic column set for every row? I would want to make sure that it is worth the extra complexity.

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