Add unencoded_byte_array_data_bytes to ParquetMetaData

parquet/src/arrow/arrow_writer/byte_array.rs

@@ -96,6 +96,7 @@ macro_rules! downcast_op {
 struct FallbackEncoder {
     encoder: FallbackEncoderImpl,
     num_values: usize,
+    variable_length_bytes: i64,
 }
 
 /// The fallback encoder in use
@@ -152,6 +153,7 @@ impl FallbackEncoder {
         Ok(Self {
             encoder,
             num_values: 0,
+            variable_length_bytes: 0,
         })
     }
 
@@ -168,7 +170,8 @@ impl FallbackEncoder {
                     let value = values.value(*idx);
                     let value = value.as_ref();
                     buffer.extend_from_slice((value.len() as u32).as_bytes());
-                    buffer.extend_from_slice(value)
+                    buffer.extend_from_slice(value);
+                    self.variable_length_bytes += value.len() as i64;
                 }
             }
             FallbackEncoderImpl::DeltaLength { buffer, lengths } => {
@@ -177,6 +180,7 @@ impl FallbackEncoder {
                     let value = value.as_ref();
                     lengths.put(&[value.len() as i32]).unwrap();
                     buffer.extend_from_slice(value);
+                    self.variable_length_bytes += value.len() as i64;
                 }
             }
             FallbackEncoderImpl::Delta {
@@ -205,6 +209,7 @@ impl FallbackEncoder {
                     buffer.extend_from_slice(&value[prefix_length..]);
                     prefix_lengths.put(&[prefix_length as i32]).unwrap();
                     suffix_lengths.put(&[suffix_length as i32]).unwrap();
+                    self.variable_length_bytes += value.len() as i64;
                 }
             }
         }
@@ -269,12 +274,17 @@ impl FallbackEncoder {
             }
         };
 
+        // Capture value of variable_length_bytes and reset for next page
+        let variable_length_bytes = Some(self.variable_length_bytes);
+        self.variable_length_bytes = 0;
+
         Ok(DataPageValues {
             buf: buf.into(),
             num_values: std::mem::take(&mut self.num_values),
             encoding,
             min_value,
             max_value,
+            variable_length_bytes,
         })
     }
 }
@@ -321,6 +331,7 @@ impl Storage for ByteArrayStorage {
 struct DictEncoder {
     interner: Interner<ByteArrayStorage>,
     indices: Vec<u64>,
+    variable_length_bytes: i64,
 }
 
 impl DictEncoder {
@@ -336,6 +347,7 @@ impl DictEncoder {
             let value = values.value(*idx);
             let interned = self.interner.intern(value.as_ref());
             self.indices.push(interned);
+            self.variable_length_bytes += value.as_ref().len() as i64;
         }
     }
 
@@ -384,12 +396,17 @@ impl DictEncoder {
 
         self.indices.clear();
 
+        // Capture value of variable_length_bytes and reset for next page
+        let variable_length_bytes = Some(self.variable_length_bytes);
+        self.variable_length_bytes = 0;
+
         DataPageValues {
             buf: encoder.consume().into(),
             num_values,
             encoding: Encoding::RLE_DICTIONARY,
             min_value,
             max_value,
+            variable_length_bytes,
         }
     }
 }

parquet/src/arrow/async_reader/metadata.rs

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

parquet/src/arrow/async_reader/mod.rs

@@ -1538,6 +1538,7 @@ mod tests {
             vec![row_group_meta],
             None,
             Some(vec![offset_index.clone()]),
+            None,
         );
 
         let metadata = Arc::new(metadata);

parquet/src/column/writer/encoder.rs

@@ -63,6 +63,7 @@ pub struct DataPageValues<T> {
     pub encoding: Encoding,
     pub min_value: Option<T>,
     pub max_value: Option<T>,
+    pub variable_length_bytes: Option<i64>,
 }
 
 /// A generic encoder of [`ColumnValues`] to data and dictionary pages used by
@@ -131,6 +132,7 @@ pub struct ColumnValueEncoderImpl<T: DataType> {
     min_value: Option<T::T>,
     max_value: Option<T::T>,
     bloom_filter: Option<Sbbf>,
+    variable_length_bytes: Option<i64>,
 }
 
 impl<T: DataType> ColumnValueEncoderImpl<T> {
@@ -150,6 +152,10 @@ impl<T: DataType> ColumnValueEncoderImpl<T> {
                 update_min(&self.descr, &min, &mut self.min_value);
                 update_max(&self.descr, &max, &mut self.max_value);
             }
+
+            if let Some(var_bytes) = T::T::variable_length_bytes(slice) {
+                *self.variable_length_bytes.get_or_insert(0) += var_bytes;
+            }
         }
 
         // encode the values into bloom filter if enabled
@@ -203,6 +209,7 @@ impl<T: DataType> ColumnValueEncoder for ColumnValueEncoderImpl<T> {
             bloom_filter,
             min_value: None,
             max_value: None,
+            variable_length_bytes: None,
         })
     }
 
@@ -296,6 +303,7 @@ impl<T: DataType> ColumnValueEncoder for ColumnValueEncoderImpl<T> {
             num_values: std::mem::take(&mut self.num_values),
             min_value: self.min_value.take(),
             max_value: self.max_value.take(),
+            variable_length_bytes: self.variable_length_bytes.take(),
         })
     }
 }

parquet/src/column/writer/mod.rs

@@ -192,7 +192,8 @@ struct PageMetrics {
 }
 
 // Metrics per column writer
-struct ColumnMetrics<T> {
+#[derive(Default)]
+struct ColumnMetrics<T: Default> {
     total_bytes_written: u64,
     total_rows_written: u64,
     total_uncompressed_size: u64,
@@ -204,6 +205,20 @@ struct ColumnMetrics<T> {
     max_column_value: Option<T>,
     num_column_nulls: u64,
     column_distinct_count: Option<u64>,
+    variable_length_bytes: Option<i64>,
+}
+
+impl<T: Default> ColumnMetrics<T> {
+    fn new() -> Self {
+        Default::default()
+    }
+
+    /// Sum the provided page variable_length_bytes into the chunk variable_length_bytes
+    fn update_variable_length_bytes(&mut self, variable_length_bytes: Option<i64>) {
+        if let Some(var_bytes) = variable_length_bytes {
+            *self.variable_length_bytes.get_or_insert(0) += var_bytes;
+        }
+    }
 }
 
 /// Typed column writer for a primitive column.
@@ -276,19 +291,7 @@ impl<'a, E: ColumnValueEncoder> GenericColumnWriter<'a, E> {
                 num_buffered_rows: 0,
                 num_page_nulls: 0,
             },
-            column_metrics: ColumnMetrics {
-                total_bytes_written: 0,
-                total_rows_written: 0,
-                total_uncompressed_size: 0,
-                total_compressed_size: 0,
-                total_num_values: 0,
-                dictionary_page_offset: None,
-                data_page_offset: None,
-                min_column_value: None,
-                max_column_value: None,
-                num_column_nulls: 0,
-                column_distinct_count: None,
-            },
+            column_metrics: ColumnMetrics::<E::T>::new(),
             column_index_builder: ColumnIndexBuilder::new(),
             offset_index_builder: OffsetIndexBuilder::new(),
             encodings,
@@ -634,7 +637,11 @@ impl<'a, E: ColumnValueEncoder> GenericColumnWriter<'a, E> {
     }
 
     /// Update the column index and offset index when adding the data page
-    fn update_column_offset_index(&mut self, page_statistics: Option<&ValueStatistics<E::T>>) {
+    fn update_column_offset_index(
+        &mut self,
+        page_statistics: Option<&ValueStatistics<E::T>>,
+        page_variable_length_bytes: Option<i64>,
+    ) {
         // update the column index
         let null_page =
             (self.page_metrics.num_buffered_rows as u64) == self.page_metrics.num_page_nulls;
@@ -708,6 +715,9 @@ impl<'a, E: ColumnValueEncoder> GenericColumnWriter<'a, E> {
         // update the offset index
         self.offset_index_builder
             .append_row_count(self.page_metrics.num_buffered_rows as i64);
+
+        self.offset_index_builder
+            .append_unencoded_byte_array_data_bytes(page_variable_length_bytes);
     }
 
     /// Determine if we should allow truncating min/max values for this column's statistics
@@ -783,7 +793,15 @@ impl<'a, E: ColumnValueEncoder> GenericColumnWriter<'a, E> {
         };
 
         // update column and offset index
-        self.update_column_offset_index(page_statistics.as_ref());
+        self.update_column_offset_index(
+            page_statistics.as_ref(),
+            values_data.variable_length_bytes,
+        );
+
+        // Update variable_length_bytes in column_metrics
+        self.column_metrics
+            .update_variable_length_bytes(values_data.variable_length_bytes);
+
         let page_statistics = page_statistics.map(Statistics::from);
 
         let compressed_page = match self.props.writer_version() {
@@ -993,7 +1011,9 @@ impl<'a, E: ColumnValueEncoder> GenericColumnWriter<'a, E> {
                 stats => stats,
             };
 
-            builder = builder.set_statistics(statistics);
+            builder = builder
+                .set_statistics(statistics)
+                .set_unencoded_byte_array_data_bytes(self.column_metrics.variable_length_bytes);
         }
 
         let metadata = builder.build()?;

parquet/src/data_type.rs

@@ -644,6 +644,13 @@ pub(crate) mod private {
             (std::mem::size_of::<Self>(), 1)
         }
 
+        /// Return the number of variable length bytes in a given slice of data
+        ///
+        /// Returns the sum of lengths for BYTE_ARRAY data, and None for all other data types
+        fn variable_length_bytes(_: &[Self]) -> Option<i64> {
+            None
+        }
+
         /// Return the value as i64 if possible
         ///
         /// This is essentially the same as `std::convert::TryInto<i64>` but can't be
@@ -956,6 +963,10 @@ pub(crate) mod private {
             Ok(num_values)
         }
 
+        fn variable_length_bytes(values: &[Self]) -> Option<i64> {
+            Some(values.iter().map(|x| x.len() as i64).sum())
+        }
+
         fn skip(decoder: &mut PlainDecoderDetails, num_values: usize) -> Result<usize> {
             let data = decoder
                 .data

parquet/src/file/metadata/memory.rs

@@ -97,6 +97,7 @@ impl HeapSize for ColumnChunkMetaData {
             + self.compression.heap_size()
             + self.statistics.heap_size()
             + self.encoding_stats.heap_size()
+            + self.unencoded_byte_array_data_bytes.heap_size()
     }
 }