Made GroupFilter optional in parquet'sRecordReader and added method to set it.

benches/read_parquet.rs

@@ -1,5 +1,4 @@
 use std::io::Read;
-use std::sync::Arc;
 use std::{fs, io::Cursor, path::PathBuf};
 
 use criterion::{criterion_group, criterion_main, Criterion};
@@ -20,8 +19,7 @@ fn to_buffer(size: usize) -> Vec<u8> {
 fn read_decompressed_pages(buffer: &[u8], size: usize, column: usize) -> Result<()> {
     let file = Cursor::new(buffer);
 
-    let reader =
-        read::RecordReader::try_new(file, Some(vec![column]), None, Arc::new(|_, _| true), None)?;
+    let reader = read::RecordReader::try_new(file, Some(vec![column]), None, None, None)?;
 
     for maybe_batch in reader {
         let batch = maybe_batch?;

examples/parquet_read_record.rs

@@ -1,5 +1,4 @@
 use std::fs::File;
-use std::sync::Arc;
 
 use arrow2::error::Result;
 use arrow2::io::parquet::read;
@@ -11,7 +10,7 @@ fn main() -> Result<()> {
     let file_path = &args[1];
 
     let reader = File::open(file_path)?;
-    let reader = read::RecordReader::try_new(reader, None, None, Arc::new(|_, _| true), None)?;
+    let reader = read::RecordReader::try_new(reader, None, None, None, None)?;
 
     for maybe_batch in reader {
         let batch = maybe_batch?;

src/io/parquet/read/record_batch.rs

@@ -24,7 +24,7 @@ pub struct RecordReader<R: Read + Seek> {
     indices: Rc<Vec<usize>>,
     buffer: Vec<u8>,
     decompress_buffer: Vec<u8>,
-    groups_filter: GroupFilter,
+    groups_filter: Option<GroupFilter>,
     pages_filter: Option<PageFilter>,
     metadata: Rc<FileMetaData>,
     current_group: usize,
@@ -36,7 +36,7 @@ impl<R: Read + Seek> RecordReader<R> {
         mut reader: R,
         projection: Option<Vec<usize>>,
         limit: Option<usize>,
-        groups_filter: GroupFilter,
+        groups_filter: Option<GroupFilter>,
         pages_filter: Option<PageFilter>,
     ) -> Result<Self> {
         let metadata = read_metadata(&mut reader)?;
@@ -89,6 +89,14 @@ impl<R: Read + Seek> RecordReader<R> {
     pub fn schema(&self) -> &Arc<Schema> {
         &self.schema
     }
+
+    pub fn metadata(&self) -> &FileMetaData {
+        self.metadata.as_ref()
+    }
+
+    pub fn set_groups_filter(&mut self, groups_filter: GroupFilter) {
+        self.groups_filter = Some(groups_filter);
+    }
 }
 
 impl<R: Read + Seek> Iterator for RecordReader<R> {
@@ -109,9 +117,11 @@ impl<R: Read + Seek> Iterator for RecordReader<R> {
         let row_group = self.current_group;
         let metadata = self.metadata.clone();
         let group = &metadata.row_groups[row_group];
-        if !(self.groups_filter)(row_group, group) {
-            self.current_group += 1;
-            return self.next();
+        if let Some(groups_filter) = self.groups_filter.as_ref() {
+            if !(groups_filter)(row_group, group) {
+                self.current_group += 1;
+                return self.next();
+            }
         }
         let columns_meta = group.columns();
 

tests/it/io/parquet/mod.rs

@@ -21,13 +21,7 @@ pub fn read_column<R: Read + Seek>(
 ) -> Result<ArrayStats> {
     let metadata = read_metadata(&mut reader)?;
 
-    let mut reader = RecordReader::try_new(
-        reader,
-        Some(vec![column]),
-        None,
-        Arc::new(|_, _| true),
-        None,
-    )?;
+    let mut reader = RecordReader::try_new(reader, Some(vec![column]), None, None, None)?;
 
     let statistics = metadata.row_groups[row_group]
         .column(column)
@@ -432,7 +426,7 @@ fn integration_write(schema: &Schema, batches: &[RecordBatch]) -> Result<Vec<u8>
 
 fn integration_read(data: &[u8]) -> Result<(Arc<Schema>, Vec<RecordBatch>)> {
     let reader = Cursor::new(data);
-    let reader = RecordReader::try_new(reader, None, None, Arc::new(|_, _| true), None)?;
+    let reader = RecordReader::try_new(reader, None, None, None, None)?;
     let schema = reader.schema().clone();
     let batches = reader.collect::<Result<Vec<_>>>()?;
 

tests/it/io/parquet/read.rs

@@ -1,5 +1,4 @@
 use std::fs::File;
-use std::sync::Arc;
 
 use arrow2::array::*;
 use arrow2::error::Result;
@@ -223,7 +222,7 @@ fn all_types() -> Result<()> {
     let path = "testing/parquet-testing/data/alltypes_plain.parquet";
     let reader = std::fs::File::open(path)?;
 
-    let reader = RecordReader::try_new(reader, None, None, Arc::new(|_, _| true), None)?;
+    let reader = RecordReader::try_new(reader, None, None, None, None)?;
 
     let batches = reader.collect::<Result<Vec<_>>>()?;
     assert_eq!(batches.len(), 1);