pvary commented on code in PR #18416:
URL: https://github.com/apache/iceberg/pull/18416#discussion_r4223985163


##########
format/spec.md:
##########
@@ -295,6 +297,12 @@ For details on how to serialize a schema to JSON, see 
Appendix C.
 
 [1001]: <https://portal.ogc.org/files/?artifact_id=25355> "OGC Simple feature 
access"
 
+##### Vector
+
+Every non-null `vector(E, D)` value must contain exactly D non-null elements 
of type E. Floating-point elements must not be `NaN`, positive infinity, or 
negative infinity. The vector value itself may be null when the containing 
field is optional.
+
+No type promotion to or from `vector` is defined, including changes to its 
element type or dimension. Lower and upper bounds are not defined for vector 
values.

Review Comment:
   If we don't have stats for vectors, then we need to rely on other means to 
identify int8/uint8 etc.



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