Jefffrey commented on code in PR #5110:
URL: https://github.com/apache/arrow-rs/pull/5110#discussion_r1405286971
##########
parquet/src/column/writer/mod.rs:
##########
@@ -703,6 +725,35 @@ impl<'a, E: ColumnValueEncoder> GenericColumnWriter<'a, E>
{
(Some(min), Some(max)) => {
update_min(&self.descr, &min, &mut
self.column_metrics.min_column_value);
update_max(&self.descr, &max, &mut
self.column_metrics.max_column_value);
+
+ // Check if min/max are still ascending/descending across pages
+ // Null pages aren't considered in this sort order
+ let null_page = (self.page_metrics.num_buffered_rows as u64)
+ == self.page_metrics.num_page_nulls;
+ if !null_page {
+ if let Some((latest_min, latest_max)) =
&self.latest_non_null_data_page_min_max
+ {
+ if self.data_page_boundary_ascending {
+ // If latest min/max are greater than new min/max
then not ascending anymore
+ let not_ascending = compare_greater(&self.descr,
latest_min, &min)
+ || compare_greater(&self.descr, latest_max,
&max);
+ if not_ascending {
+ self.data_page_boundary_ascending = false;
+ }
+ }
+
+ if self.data_page_boundary_descending {
+ // If new min/max are greater than latest min/max
then not descending anymore
+ let not_descending = compare_greater(&self.descr,
&min, latest_min)
+ || compare_greater(&self.descr, &max,
latest_max);
+ if not_descending {
+ self.data_page_boundary_descending = false;
+ }
+ }
+ }
+ self.latest_non_null_data_page_min_max =
Some((min.clone(), max.clone()));
+ }
Review Comment:
Tried putting the incremental check here instead of inside
`update_column_offset_index(..)` as I couldn't figure out an easy way to get
the `T: ParquetValueType` out of a `Statistics` enum
One caveat about putting this check here is that it compares the min/maxes
**before** truncation occurs, though I _think_ this should still be ok.
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