Deprecate read_page_locations() and simplify offset index in ParquetMetaData

parquet/src/arrow/arrow_reader/mod.rs

@@ -394,7 +394,7 @@ impl ArrowReaderMetadata {
             let offset_index = metadata
                 .row_groups()
                 .iter()
-                .map(|rg| index_reader::read_pages_locations(reader, rg.columns()))
+                .map(|rg| index_reader::read_offset_indexes(reader, rg.columns()))
                 .collect::<Result<Vec<_>>>()?;
 
             metadata.set_offset_index(Some(offset_index))
@@ -689,7 +689,7 @@ impl<T: ChunkReader + 'static> Iterator for ReaderPageIterator<T> {
         // To avoid `i[rg_idx][self.oolumn_idx`] panic, we need to filter out empty `i[rg_idx]`.
         let page_locations = offset_index
             .filter(|i| !i[rg_idx].is_empty())
-            .map(|i| i[rg_idx][self.column_idx].clone());
+            .map(|i| i[rg_idx][self.column_idx].page_locations.clone());
         let total_rows = rg.num_rows() as usize;
         let reader = self.reader.clone();
 

parquet/src/arrow/arrow_reader/statistics.rs

@@ -1349,7 +1349,9 @@ impl<'a> StatisticsConverter<'a> {
         let iter = row_group_indices.into_iter().map(|rg_index| {
             let column_page_index_per_row_group_per_column =
                 &column_page_index[*rg_index][parquet_index];
-            let num_data_pages = &column_offset_index[*rg_index][parquet_index].len();
+            let num_data_pages = &column_offset_index[*rg_index][parquet_index]
+                .page_locations()
+                .len();
 
             (*num_data_pages, column_page_index_per_row_group_per_column)
         });
@@ -1378,7 +1380,9 @@ impl<'a> StatisticsConverter<'a> {
         let iter = row_group_indices.into_iter().map(|rg_index| {
             let column_page_index_per_row_group_per_column =
                 &column_page_index[*rg_index][parquet_index];
-            let num_data_pages = &column_offset_index[*rg_index][parquet_index].len();
+            let num_data_pages = &column_offset_index[*rg_index][parquet_index]
+                .page_locations()
+                .len();
 
             (*num_data_pages, column_page_index_per_row_group_per_column)
         });
@@ -1408,7 +1412,9 @@ impl<'a> StatisticsConverter<'a> {
         let iter = row_group_indices.into_iter().map(|rg_index| {
             let column_page_index_per_row_group_per_column =
                 &column_page_index[*rg_index][parquet_index];
-            let num_data_pages = &column_offset_index[*rg_index][parquet_index].len();
+            let num_data_pages = &column_offset_index[*rg_index][parquet_index]
+                .page_locations()
+                .len();
 
             (*num_data_pages, column_page_index_per_row_group_per_column)
         });
@@ -1450,7 +1456,7 @@ impl<'a> StatisticsConverter<'a> {
 
         let mut row_count_total = Vec::new();
         for rg_idx in row_group_indices {
-            let page_locations = &column_offset_index[*rg_idx][parquet_index];
+            let page_locations = &column_offset_index[*rg_idx][parquet_index].page_locations();
 
             let row_count_per_page = page_locations
                 .windows(2)

parquet/src/arrow/arrow_writer/mod.rs

@@ -1096,7 +1096,7 @@ mod tests {
     use crate::data_type::AsBytes;
     use crate::file::metadata::ParquetMetaData;
     use crate::file::page_index::index::Index;
-    use crate::file::page_index::index_reader::read_pages_locations;
+    use crate::file::page_index::index_reader::read_offset_indexes;
     use crate::file::properties::{
         BloomFilterPosition, EnabledStatistics, ReaderProperties, WriterVersion,
     };
@@ -1669,16 +1669,16 @@ mod tests {
             "Expected a dictionary page"
         );
 
-        let page_locations = read_pages_locations(&file, column).unwrap();
+        let offset_indexes = read_offset_indexes(&file, column).unwrap();
 
-        let offset_index = page_locations[0].clone();
+        let page_locations = offset_indexes[0].page_locations.clone();
 
         // We should fallback to PLAIN encoding after the first row and our max page size is 1 bytes
         // so we expect one dictionary encoded page and then a page per row thereafter.
         assert_eq!(
-            offset_index.len(),
+            page_locations.len(),
             10,
-            "Expected 9 pages but got {offset_index:#?}"
+            "Expected 9 pages but got {page_locations:#?}"
         );
     }
 
@@ -3020,8 +3020,8 @@ mod tests {
 
         assert_eq!(index.len(), 1);
         assert_eq!(index[0].len(), 2); // 2 columns
-        assert_eq!(index[0][0].len(), 1); // 1 page
-        assert_eq!(index[0][1].len(), 1); // 1 page
+        assert_eq!(index[0][0].page_locations().len(), 1); // 1 page
+        assert_eq!(index[0][1].page_locations().len(), 1); // 1 page
     }
 
     #[test]

parquet/src/arrow/async_reader/metadata.rs

@@ -20,9 +20,7 @@ use crate::errors::{ParquetError, Result};
 use crate::file::footer::{decode_footer, decode_metadata};
 use crate::file::metadata::ParquetMetaData;
 use crate::file::page_index::index::Index;
-use crate::file::page_index::index_reader::{
-    acc_range, decode_column_index, decode_page_locations,
-};
+use crate::file::page_index::index_reader::{acc_range, decode_column_index, decode_offset_index};
 use bytes::Bytes;
 use futures::future::BoxFuture;
 use futures::FutureExt;
@@ -179,9 +177,7 @@ impl<F: MetadataFetch> MetadataLoader<F> {
                     x.columns()
                         .iter()
                         .map(|c| match c.offset_index_range() {
-                            Some(r) => {
-                                decode_page_locations(&data[r.start - offset..r.end - offset])
-                            }
+                            Some(r) => decode_offset_index(&data[r.start - offset..r.end - offset]),
                             None => Err(general_err!("missing offset index")),
                         })
                         .collect::<Result<Vec<_>>>()

parquet/src/arrow/async_reader/mod.rs

@@ -106,9 +106,10 @@ use crate::column::page::{PageIterator, PageReader};
 use crate::errors::{ParquetError, Result};
 use crate::file::footer::{decode_footer, decode_metadata};
 use crate::file::metadata::{ParquetMetaData, RowGroupMetaData};
+use crate::file::page_index::offset_index::OffsetIndexMetaData;
 use crate::file::reader::{ChunkReader, Length, SerializedPageReader};
 use crate::file::FOOTER_SIZE;
-use crate::format::{BloomFilterAlgorithm, BloomFilterCompression, BloomFilterHash, PageLocation};
+use crate::format::{BloomFilterAlgorithm, BloomFilterCompression, BloomFilterHash};
 
 mod metadata;
 pub use metadata::*;
@@ -489,7 +490,7 @@ where
         // TODO: calling build_array multiple times is wasteful
 
         let meta = self.metadata.row_group(row_group_idx);
-        let page_locations = self
+        let offset_index = self
             .metadata
             .offset_index()
             .map(|x| x[row_group_idx].as_slice());
@@ -499,7 +500,7 @@ where
             // schema: meta.schema_descr_ptr(),
             row_count: meta.num_rows() as usize,
             column_chunks: vec![None; meta.columns().len()],
-            page_locations,
+            offset_index,
         };
 
         if let Some(filter) = self.filter.as_mut() {
@@ -703,7 +704,7 @@ where
 /// An in-memory collection of column chunks
 struct InMemoryRowGroup<'a> {
     metadata: &'a RowGroupMetaData,
-    page_locations: Option<&'a [Vec<PageLocation>]>,
+    offset_index: Option<&'a [OffsetIndexMetaData]>,
     column_chunks: Vec<Option<Arc<ColumnChunkData>>>,
     row_count: usize,
 }
@@ -716,7 +717,7 @@ impl<'a> InMemoryRowGroup<'a> {
         projection: &ProjectionMask,
         selection: Option<&RowSelection>,
     ) -> Result<()> {
-        if let Some((selection, page_locations)) = selection.zip(self.page_locations) {
+        if let Some((selection, offset_index)) = selection.zip(self.offset_index) {
             // If we have a `RowSelection` and an `OffsetIndex` then only fetch pages required for the
             // `RowSelection`
             let mut page_start_offsets: Vec<Vec<usize>> = vec![];
@@ -734,14 +735,14 @@ impl<'a> InMemoryRowGroup<'a> {
                     // then we need to also fetch a dictionary page.
                     let mut ranges = vec![];
                     let (start, _len) = chunk_meta.byte_range();
-                    match page_locations[idx].first() {
+                    match offset_index[idx].page_locations.first() {
                         Some(first) if first.offset as u64 != start => {
                             ranges.push(start as usize..first.offset as usize);
                         }
                         _ => (),
                     }
 
-                    ranges.extend(selection.scan_ranges(&page_locations[idx]));
+                    ranges.extend(selection.scan_ranges(&offset_index[idx].page_locations));
                     page_start_offsets.push(ranges.iter().map(|range| range.start).collect());
 
                     ranges
@@ -812,7 +813,9 @@ impl<'a> RowGroups for InMemoryRowGroup<'a> {
                 "Invalid column index {i}, column was not fetched"
             ))),
             Some(data) => {
-                let page_locations = self.page_locations.map(|index| index[i].clone());
+                let page_locations = self
+                    .offset_index
+                    .map(|index| index[i].page_locations.clone());
                 let page_reader: Box<dyn PageReader> = Box::new(SerializedPageReader::new(
                     data.clone(),
                     self.metadata.column(i),
@@ -1529,7 +1532,7 @@ mod tests {
         let metadata = parse_metadata(&data).unwrap();
 
         let offset_index =
-            index_reader::read_pages_locations(&data, metadata.row_group(0).columns())
+            index_reader::read_offset_indexes(&data, metadata.row_group(0).columns())
                 .expect("reading offset index");
 
         let row_group_meta = metadata.row_group(0).clone();
@@ -1538,7 +1541,6 @@ mod tests {
             vec![row_group_meta],
             None,
             Some(vec![offset_index.clone()]),
-            None,
         );
 
         let metadata = Arc::new(metadata);
@@ -1575,7 +1577,7 @@ mod tests {
         };
 
         let mut skip = true;
-        let mut pages = offset_index[0].iter().peekable();
+        let mut pages = offset_index[0].page_locations.iter().peekable();
 
         // Setup `RowSelection` so that we can skip every other page, selecting the last page
         let mut selectors = vec![];

parquet/src/bin/parquet-index.rs

@@ -37,6 +37,7 @@
 use clap::Parser;
 use parquet::errors::{ParquetError, Result};
 use parquet::file::page_index::index::{Index, PageIndex};
+use parquet::file::page_index::offset_index::OffsetIndexMetaData;
 use parquet::file::reader::{FileReader, SerializedFileReader};
 use parquet::file::serialized_reader::ReadOptionsBuilder;
 use parquet::format::PageLocation;
@@ -93,7 +94,8 @@ impl Args {
                 ))
             })?;
 
-            let row_counts = compute_row_counts(offset_index, row_group.num_rows());
+            let row_counts =
+                compute_row_counts(offset_index.page_locations.as_slice(), row_group.num_rows());
             match &column_indices[column_idx] {
                 Index::NONE => println!("NO INDEX"),
                 Index::BOOLEAN(v) => print_index(&v.indexes, offset_index, &row_counts)?,
@@ -131,20 +133,20 @@ fn compute_row_counts(offset_index: &[PageLocation], rows: i64) -> Vec<i64> {
 /// Prints index information for a single column chunk
 fn print_index<T: std::fmt::Display>(
     column_index: &[PageIndex<T>],
-    offset_index: &[PageLocation],
+    offset_index: &OffsetIndexMetaData,
     row_counts: &[i64],
 ) -> Result<()> {
-    if column_index.len() != offset_index.len() {
+    if column_index.len() != offset_index.page_locations.len() {
         return Err(ParquetError::General(format!(
             "Index length mismatch, got {} and {}",
             column_index.len(),
-            offset_index.len()
+            offset_index.page_locations.len()
         )));
     }
 
     for (idx, ((c, o), row_count)) in column_index
         .iter()
-        .zip(offset_index)
+        .zip(offset_index.page_locations())
         .zip(row_counts)
         .enumerate()
     {

parquet/src/file/metadata/memory.rs

@@ -23,6 +23,7 @@ use crate::data_type::private::ParquetValueType;
 use crate::file::metadata::{ColumnChunkMetaData, FileMetaData, KeyValue, RowGroupMetaData};
 use crate::file::page_encoding_stats::PageEncodingStats;
 use crate::file::page_index::index::{Index, NativeIndex, PageIndex};
+use crate::file::page_index::offset_index::OffsetIndexMetaData;
 use crate::file::statistics::{Statistics, ValueStatistics};
 use crate::format::{BoundaryOrder, PageLocation, SortingColumn};
 use std::sync::Arc;
@@ -144,6 +145,12 @@ impl HeapSize for Statistics {
     }
 }
 
+impl HeapSize for OffsetIndexMetaData {
+    fn heap_size(&self) -> usize {
+        self.page_locations.heap_size() + self.unencoded_byte_array_data_bytes.heap_size()
+    }
+}
+
 impl HeapSize for Index {
     fn heap_size(&self) -> usize {
         match self {