szehon-ho commented on code in PR #9661:
URL: https://github.com/apache/iceberg/pull/9661#discussion_r1484906929
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format/spec.md:
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@@ -1130,14 +1140,11 @@ Each partition field in the fields list is stored as an
object. See the table fo
|**`hour`**|`JSON string: "hour"`|`"hour"`|
|**`Partition Field`** [1,2]|`JSON object: {`<br /> `"source-id":
<id int>,`<br /> `"field-id": <field id int>,`<br
/> `"name": <name string>,`<br /> `"transform":
<transform JSON>`<br />`}`|`{`<br /> `"source-id": 1,`<br
/> `"field-id": 1000,`<br /> `"name": "id_bucket",`<br
/> `"transform": "bucket[16]"`<br />`}`|
-In some cases partition specs are stored using only the field list instead of
the object format that includes the spec ID, like the deprecated
`partition-spec` field in table metadata. The object format should be used
unless otherwise noted in this spec.
-
-The `field-id` property was added for each partition field in v2. In v1, the
reference implementation assigned field ids sequentially in each spec starting
at 1,000. See Partition Evolution for more details.
-
Notes:
-
-1. For partition fields with a transform with a single argument, the ID of the
source field is set on `source-id`, and `source-ids` is omitted.
-2. For partition fields with a transform of multiple arguments, the IDs of the
source fields are set on `source-ids`. To preserve backward compatibility,
`source-id` is set to -1.
+1. In some cases partition specs are stored using only the field list instead
of the object format that includes the spec ID, like the deprecated
`partition-spec` field in table metadata. The object format should be used
unless otherwise noted in this spec.
+2. The `field-id` property was added for each partition field in v2. In v1,
the reference implementation assigned field ids sequentially in each spec
starting at 1,000. See Partition Evolution for more details.
+3. For partition fields with a transform with a single argument, the ID of the
source field is set on `source-id`, and `source-ids` is omitted.
+4. For partition fields with a transform with multiple arguments (allowed in
tables of version >=V3 or if compatibility.multi-arg-transform.enabled is
true), the IDs of the source fields are set on `source-ids`, and `source-id` is
set to -1.
Review Comment:
In the end, we removed mention of the flag (its not appropriate for the
spec, but is more an implementation detail)
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