szehon-ho commented on code in PR #17822:
URL: https://github.com/apache/iceberg/pull/17822#discussion_r4361899047


##########
format/spec.md:
##########
@@ -420,6 +421,8 @@ Type promotion is not allowed for a field that is 
referenced by `source-id` or `
 
 * `date` to `timestamp` or `timestamp_ns`
 
+Every field referenced by a [constraint](#constraints) must exist in the 
table's current schema. A schema change that removes a constraint-referenced 
field must be rejected unless the constraint is removed in the same change.

Review Comment:
   can we consolidate this schema evolution section with the bottom one (maybe 
put a link?)



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