rdblue commented on code in PR #10955:
URL: https://github.com/apache/iceberg/pull/10955#discussion_r1779173333
##########
format/spec.md:
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@@ -174,6 +174,7 @@ Supported primitive types are defined in the table below.
Primitive types added
| Added by version | Primitive type | Description
| Requirements
|
|------------------|--------------------|--------------------------------------------------------------------------|--------------------------------------------------|
+| [v3](#version-3) | **`unknown`** | Default / null column type used when
a more specific type is not known | Must be optional with `null` defaults
|
Review Comment:
This is for cases where you create a table from example data, but have only
seen null values for a column. The column exists (and should be accessible) but
the table doesn't know what the type is yet.
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