rdblue commented on a change in pull request #1141:
URL: https://github.com/apache/iceberg/pull/1141#discussion_r552201989
##########
File path: site/docs/spec.md
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@@ -218,10 +218,27 @@ Partition specs capture the transform from table data to
partition values. This
| **`month`** | Extract a date or timestamp month, as months from
1970-01-01 | `date`, `timestamp(tz)`
| `int` |
| **`day`** | Extract a date or timestamp day, as days from 1970-01-01
| `date`, `timestamp(tz)`
| `date` |
| **`hour`** | Extract a timestamp hour, as hours from 1970-01-01
00:00:00 | `timestamp(tz)`
| `int` |
+| **`void`** | Always produces `null` (the void transform)
| Any
| `null` |
All transforms must return `null` for a `null` input value.
+#### Partition Field ID handling
+
+A partition field ID is an integer used to identify a partition field.
+Field IDs are required in v2 and optional in v1.
+
+About compatibility between v1 and v2 tables:
+
+* For backward compatibility, if field ids are missing in a table metadata,
iceberg will sequentially generate ids for each field starting at 1000 based on
its position in the list of fields.
Review comment:
This should not refer to what "iceberg" does. There are things required
by this spec and there are implementations. Both are "iceberg".
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