huaxingao commented on code in PR #17822:
URL: https://github.com/apache/iceberg/pull/17822#discussion_r4362623426


##########
format/spec.md:
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@@ -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:
   Done. Moved all the schema rules for constraints into the Schema Evolution 
section, and renamed the constraint section to Constraint Evolution.



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