RussellSpitzer commented on code in PR #16025:
URL: https://github.com/apache/iceberg/pull/16025#discussion_r4160330818


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format/spec.md:
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@@ -546,7 +552,7 @@ Note that:
 
 ### Partitioning
 
-Data files are stored in manifests with a tuple of partition values that are 
used in scans to filter out files that cannot contain records that match the 
scan’s filter predicate. Partition values for a data file must be the same for 
all records stored in the data file. (Manifests store data files from any 
partition, as long as the partition spec is the same for the data files.)
+Data files are stored in manifests with a tuple of partition values that are 
used in scans to filter out files that cannot contain records that match the 
scan’s filter predicate. Partition values for a data file must be the same for 
all records stored in the data file. Manifests store data files from any 
partition. v4 manifests may store partitions from any spec, but manifests in v3 
and earlier store files for a single spec. A manifest is considered partitioned 
by a spec if every entry in the manifest is partitioned by that spec.

Review Comment:
   I'd drop this line "A manifest is considered partitioned by a spec if every 
entry in the manifest is partitioned by that spec." unless this is something we 
want to use somewhere else. 



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