rdblue commented on code in PR #466:
URL: https://github.com/apache/parquet-format/pull/466#discussion_r1835180625
##########
LogicalTypes.md:
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@@ -648,49 +650,105 @@ 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, meaning that
`LIST`
+annotates a 2-level structure. In contrast to 3-level structure, the repetition
+of 2-level structure can be `optional`, `required`, or `repeated`.
Review Comment:
I find this confusing. Why does it need to change?
The problem isn't when there is a 2-level structure like the one in the new
example. The problem is when we need to decide whether a structure is a 2-level
or 3-level.
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