mapleFU commented on PR #43995:
URL: https://github.com/apache/arrow/pull/43995#issuecomment-2341403849

   > Where is this in the Parquet spec? I cannot find a [similar 
example](https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#lists).
   
   The wording of the spec is very ambigious:
   
   > If the repeated field is not a group, then its type is the element type 
and elements are required.
   If the repeated field is a group with multiple fields, then its type is the 
element type and elements are required.
   If the repeated field is a group with one field and is named either array or 
uses the LIST-annotated group's name with _tuple appended then the repeated 
type is the element type and elements are required.
   Otherwise, the repeated field's type is the element type with the repeated 
field's repetition.
   
   I think this just following the rule(1): the repeated field is not a group, 
then its type is the element type and elements are required.


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