I've recently done some work on adding support for DataPageV2 to the cpp
code base [1].  A question came up if the uncompressed_page_size includes
the levels which are not compressed in the V2 format anyway.

My understanding of the thrift specification [2] is that the levels are
included in this size.  Can someone help confirm whether this
interpretation is correct?

Thanks,

Hatem

[1] https://github.com/apache/arrow/pull/6481
[2]
https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L623

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