virajjasani commented on pull request #1118:
URL: https://github.com/apache/phoenix/pull/1118#issuecomment-769003852


   Nice points.
   
   > Do we store the PK field(s) in actual cell, or are they only present in 
the rowkey ?
   
   For user created tables, their pk (and non-pk) columns are actually rowkeys 
in SYSTEM.CATALOG. The cells represent specific properties like `DATA_TYPE`, 
`NULLABLE` etc.
   
   > What happens when you specify a CF for a PK field ? is it even valid ?
   
   I think we can't specify CF for PK. We have this special Exception for it: 
`PRIMARY_KEY_WITH_FAMILY_NAME`
   
   
   Based on some unit tests written very initially, it seems we do allow 
creating same column name (with user defined columnFamily) as Pk column name, 
but that is the very reason why the same would apply to default columnFamily 
and hence, any user created table can have Pk and non-Pk column names same.


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