jbonofre commented on code in PR #12644:
URL: https://github.com/apache/iceberg/pull/12644#discussion_r2037902209
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format/spec.md:
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@@ -1414,12 +1414,16 @@ Each partition field in `fields` is stored as a JSON
object with the following p
| V1 | V2 | V3 | Field | JSON representation |
Example |
|----------|----------|----------|------------------|---------------------|--------------|
-| required | required | omitted | **`source-id`** | `JSON int` | 1
|
Review Comment:
While starting the update of core, I think `source-ids` should be required.
The workflow would be:
1. For the reader:
1.1. We read `source-ids`
1.2. If `source-ids` is not present or null, we read `source-id` (for
backward compatibility)
2. For the writer:
2.1. We write always `source-ids` (`source-id` doesn't exist anymore on new
writer)
2.2. For single arg transform, we also write `source-id`
NB: `source-ids` is a JSON list of ints field, e.g. `[1,3,5]` for instance
(`source-id` is a int field as it's a single value field).
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