emkornfield commented on code in PR #535:
URL: https://github.com/apache/parquet-format/pull/535#discussion_r2597405446
##########
src/main/thrift/parquet.thrift:
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@@ -715,6 +715,13 @@ struct DictionaryPageHeader {
* New page format allowing reading levels without decompressing the data
* Repetition and definition levels are uncompressed
* The remaining section containing the data is compressed if is_compressed is
true
+ *
+ * Implementation note - this header is not necessarily a strict improvement
over
+ * `DataPageHeader` (in particular the original header might provide better
compression
+ * in some scenarios). Page indexes require pages start and end at row
boundaries regardless of which
+ * page header is used.
+ *
+ * As of December 2025, most known Parquet readers can read pages using this
header.
Review Comment:
rehrased along these lines.
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