rdblue commented on code in PR #8730:
URL: https://github.com/apache/iceberg/pull/8730#discussion_r1349759341
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format/spec.md:
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@@ -443,13 +443,13 @@ The schema of a manifest file is a struct called
`manifest_entry` with the follo
| _optional_ | _optional_ | **`132 split_offsets`** | `list<133:
long>` | Split offsets for the data file. For example, all row group
offsets in a Parquet file. Must be sorted ascending |
| | _optional_ | **`135 equality_ids`** | `list<136:
int>` | Field ids used to determine row equality in equality delete
files. Required when `content=2` and should be null otherwise. Fields with ids
listed in this column must be present in the delete file |
| _optional_ | _optional_ | **`140 sort_order_id`** | `int`
| ID representing sort order for this file [3]. |
-
+| _optional_ | _optional_ | **`141 spec_id`** | `int`
| ID representing partition spec for this file [4]. |
Review Comment:
This isn't optional. The field ID is reserved, but it should never be
written to a metadata file.
We need to reserve an ID for it because it is present in metadata tables. We
don't want to have conflicting IDs when reading these files. I think all we
need to communicate is that no one should write any field with ID 141, which is
why we noted it was reserved here.
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