Fokko commented on code in PR #8683:
URL: https://github.com/apache/iceberg/pull/8683#discussion_r1360934237


##########
format/spec.md:
##########
@@ -874,6 +878,11 @@ Maps with non-string keys must use an array representation 
with the `map` logica
 |**`list`**|`array`||
 |**`map`**|`array` of key-value records, or `map` when keys are strings 
(optional).|Array storage must use logical type name `map` and must store 
elements that are 2-field records. The first field is a non-null key and the 
second field is the value.|
 
+Notes:
+
+1. Avro type annotation `adjust-to-utc` is an Iceberg convention; default 
value is `false` if not present.
+2. Avro logical type `timestamp-nanos` is an Iceberg convention; the Avro 
specification does not define this type.

Review Comment:
   Ah, we should update that page, that's not helping anyone. You can easily 
see the devlist on ponymail: 
https://lists.apache.org/list.html?d...@avro.apache.org
   
   On the bottom-left you can subscribe to the devlist. You can find my message 
here: https://lists.apache.org/thread/s985tc2m6bj5lvck017q06zkt3dg1f31 or the 
PR https://github.com/apache/avro/pull/2554. Feel free to chime in anywhere.



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