wgtmac commented on code in PR #466:
URL: https://github.com/apache/parquet-format/pull/466#discussion_r1855134279
##########
LogicalTypes.md:
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@@ -684,44 +702,68 @@ optional group my_list (LIST) {
}
```
-Some existing data does not include the inner element layer. For
-backward-compatibility, the type of elements in `LIST`-annotated structures
-should always be determined by the following rules:
+##### 2-level structure
+
+Some existing data does not include the inner element layer, resulting in a
+`LIST` that annotates a 2-level structure. Unlike the 3-level structure, the
+repetition of a 2-level structure can be `optional`, `required`, or `repeated`.
Review Comment:
I think this is clear because we are talking about the whole 2-level
structure here.
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