RussellSpitzer commented on code in PR #12658:
URL: https://github.com/apache/iceberg/pull/12658#discussion_r2050951788


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format/spec.md:
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@@ -648,6 +648,21 @@ Notes:
 5. The `content_offset` and `content_size_in_bytes` fields are used to 
reference a specific blob for direct access to a deletion vector. For deletion 
vectors, these values are required and must exactly match the `offset` and 
`length` stored in the Puffin footer for the deletion vector blob.
 6. The following field ids are reserved on `data_file`: 141.
 
+For Variant, values in the `lower_bounds` and `upper_bounds` maps store the a 
serialized Variant object that contains lower and upper bounds for fields 
within the Variant. The object keys are normalized JSON path expressions that 
uniquely identify a Variant field. The object values are primitive Variant 
representations of the lower or upper bound for the field. Including bounds for 
any field is optional and the bounds must have the same Variant type.

Review Comment:
   Some grammar fixes as well as some wording changes. Semantically the same



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