rdblue commented on a change in pull request #1141:
URL: https://github.com/apache/iceberg/pull/1141#discussion_r552203219
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File path: site/docs/spec.md
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@@ -830,6 +847,11 @@ Each partition field in the fields list is stored as an
object. See the table fo
In some cases partition specs are stored using only the field list instead of
the object format that includes the spec ID, like the deprecated
`partition-spec` field in table metadata. The object format should be used
unless otherwise noted in this spec.
+#### Partition Field ID
+
+A partition field ID is an integer used to identify a partition field.
+They are unique and do not conflict with field IDs for columns in manifest
files.
Review comment:
This should be "must not" because it is a requirement, not a guarantee.
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