aokolnychyi commented on code in PR #11130:
URL: https://github.com/apache/iceberg/pull/11130#discussion_r1803908468
##########
format/spec.md:
##########
@@ -298,16 +298,101 @@ Iceberg tables must not use field ids greater than
2147483447 (`Integer.MAX_VALU
The set of metadata columns is:
-| Field id, name | Type | Description |
-|-----------------------------|---------------|-------------|
-| **`2147483646 _file`** | `string` | Path of the file in which a
row is stored |
-| **`2147483645 _pos`** | `long` | Ordinal position of a row in
the source data file |
-| **`2147483644 _deleted`** | `boolean` | Whether the row has been
deleted |
-| **`2147483643 _spec_id`** | `int` | Spec ID used to track the file
containing a row |
-| **`2147483642 _partition`** | `struct` | Partition to which a row
belongs |
-| **`2147483546 file_path`** | `string` | Path of a file, used in
position-based delete files |
-| **`2147483545 pos`** | `long` | Ordinal position of a row,
used in position-based delete files |
-| **`2147483544 row`** | `struct<...>` | Deleted row values, used in
position-based delete files |
+| Field id, name | Type | Description
|
+|----------------------------------|---------------|--------------------------------------------------------------------------------------------------------|
+| **`2147483646 _file`** | `string` | Path of the file in which
a row is stored |
+| **`2147483645 _pos`** | `long` | Ordinal position of a row
in the source data file, starting at `0` |
+| **`2147483644 _deleted`** | `boolean` | Whether the row has been
deleted |
+| **`2147483643 _spec_id`** | `int` | Spec ID used to track the
file containing a row |
+| **`2147483642 _partition`** | `struct` | Partition to which a row
belongs |
+| **`2147483546 file_path`** | `string` | Path of a file, used in
position-based delete files |
+| **`2147483545 pos`** | `long` | Ordinal position of a
row, used in position-based delete files
|
+| **`2147483544 row`** | `struct<...>` | Deleted row values, used
in position-based delete files |
+| **`2147483543 _row_id`** | `long` | A unique long assigned
when row-lineage is enabled, see [Row Lineage](#row-lineage)
|
+| **`2147483542 _last_updated_sequence_number`** | `long` | The
sequence number which last updated this row when row-lineage is enabled [Row
Lineage](#row-lineage) |
+
+### Row Lineage
+
+In v3 and later, an Iceberg table can track row lineage fields for all newly
created rows. Row lineage is enabled by setting the field `row-lineage` to
true in the table's metadata. When enabled, engines must maintain the
`next-row-id` table field and the following row-level fields when writing data
files:
+
+* `_row_id` a unique long identifier for every row within the table. The value
is assigned via inheritance when a row is first added to the table and the
existing value is explicitly written when the row is written to a new file.
Review Comment:
`written to a new file` -> `copied to a new file` or something like that?
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