rdblue commented on a change in pull request #1141:
URL: https://github.com/apache/iceberg/pull/1141#discussion_r551652497
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File path: site/docs/spec.md
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@@ -646,6 +647,25 @@ 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 Handling
+
+A partition field ID is an integer used to identify a partition field.
+These IDs should not conflict with the IDs required for the other fields in
data files.
+To avoid that, iceberg assigns partition field IDs starting at 1000.
Review comment:
The requirement is that IDs are unique and do not conflict with field
IDs for columns in manifest files. The _reference implementation_ assigns
partition field IDs starting at 1,000.
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