rdblue commented on code in PR #12658:
URL: https://github.com/apache/iceberg/pull/12658#discussion_r2049503325


##########
format/spec.md:
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@@ -1558,6 +1561,7 @@ The binary single-value serialization can be used to 
store the lower and upper b
 
|------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | **`geometry`**               | A single point, encoded as a x:y:z:m 
concatenation of its 8-byte little-endian IEEE 754 coordinate values. x and y 
are mandatory. This becomes x:y if z and m are both unset, x:y:z if only m is 
unset, and x:y:NaN:m if only z is unset. |
 | **`geography`**              | A single point, encoded as a x:y:z:m 
concatenation of its 8-byte little-endian IEEE 754 coordinate values. x and y 
are mandatory. This becomes x:y if z and m are both unset, x:y:z if only m is 
unset, and x:y:NaN:m if only z is unset. |
+| **`variant`**                | The serialized value consists of a variant 
metadata(v1) concatenated with a variant object. The object's fields are field 
paths in the normalized JSON path format and the values are the upper or lower 
bounds for the corresponding shredded type in the data file. |

Review Comment:
   ```suggestion
   | **`variant`**                | A serialized Variant of encoded v1 metadata 
concatenated with an encoded variant object. Object keys are normalized JSON 
paths to identify fields; values are lower or upper bound values. |
   ```



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