rdblue commented on code in PR #5151:
URL: https://github.com/apache/iceberg/pull/5151#discussion_r909086063


##########
format/spec.md:
##########
@@ -218,6 +218,8 @@ Valid type promotions are:
 * `int` to `long`
 * `float` to `double`
 * `decimal(P, S)` to `decimal(P', S)` if `P' > P` -- widen the precision of 
decimal types.
+* `bytes` to `string`
+* `string` to `bytes`

Review Comment:
   We're going to need to ensure this is implemented in Java, and add a note 
about compatibility. This isn't a forward-compatible change.



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