etseidl commented on code in PR #197:
URL: https://github.com/apache/parquet-format/pull/197#discussion_r1323524900
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src/main/thrift/parquet.thrift:
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@@ -977,6 +1038,25 @@ struct ColumnIndex {
/** A list containing the number of null values for each page **/
5: optional list<i64> null_counts
+
+ /**
+ * Contains repetition level histograms for more details) for each page
+ * concatenated together. The repetition_level_histogram field on
+ * SizeStatistics contains more details.
+ *
+ * When present the length should always be (number of pages *
+ * (max_repetition_level + 1)) elements in size.
+ *
+ * Element 0 is the first element of the histogram for the first page.
+ * Element (max_repetition_level + 1) is the first element of the histogram
+ * for the second page.
Review Comment:
Speaking of data, as will surprise no one, the current set of changes has a
huge impact on the column index size (at least for the cases with thousands of
pages with short histograms). I can post an update to the index size tables if
there's interest.
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