LuciferYang commented on PR #9966:
URL: https://github.com/apache/paimon/pull/9966#issuecomment-6017358077

   Narrowed in adbd0b2 as suggested:
   
   - Scan: no coverage calculation. If a group has a normal file and pruning 
leaves only blob/vector-store files, keep the oldest normal anchor. 
Dedicated-only groups are returned unchanged. Conditional anchor removal goes 
to a separate PR.
   - Planner: the range path is used only when a projected column's bunch 
cannot read every row. Fully covered rolled bunches stay sequential.
   
   Table-read tests now cover full-snapshot and DELTA reads, one and two BLOB 
columns, partial and fully covered vector columns, row-range pushdown and 
deletion vectors.
   
   Still open, and the same on master: a dedicated-only DELTA group throws when 
the projection hits none of its files, or when deletion vectors are on, because 
both paths look up the anchor on the whole group. Tracked in #10406; I'll fix 
it in a follow-up so it reads like a delta of a normal-file partial update, 
which already returns its rows with the unprojected columns NULL.
   


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