rdblue commented on code in PR #8730:
URL: https://github.com/apache/iceberg/pull/8730#discussion_r1373912012
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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]. |
Notes:
1. Single-value serialization for lower and upper bounds is detailed in
Appendix D.
2. For `float` and `double`, the value `-0.0` must precede `+0.0`, as in the
IEEE 754 `totalOrder` predicate. NaNs are not permitted as lower or upper
bounds.
3. If sort order ID is missing or unknown, then the order is assumed to be
unsorted. Only data files and equality delete files should be written with a
non-null order id. [Position deletes](#position-delete-files) are required to
be sorted by file and position, not a table order, and should set sort order id
to null. Readers must ignore sort order id for position delete files.
-4. The following field ids are reserved on `data_file`: 141.
+4. Field ID 141 is reserved in `data_file` for `spec_id`` representing the
partition spec. Note that in practice spec_id is not written in the data file
and is inherited from the manifest file.
Review Comment:
Looks like a typo. `spec_id` has an extra backtick after it.
The `spec_id` isn't just not written in practice. It _can_ be passed in a
data file's in-memory representation using field ID 141, but that is not a
requirement and it should never be written into a manifest.
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