Ted-Jiang commented on code in PR #1998:
URL: https://github.com/apache/arrow-rs/pull/1998#discussion_r912608716
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parquet/src/arrow/arrow_reader.rs:
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@@ -222,13 +271,47 @@ pub struct ParquetRecordBatchReader {
batch_size: usize,
array_reader: Box<dyn ArrayReader>,
schema: SchemaRef,
+ selection: Option<VecDeque<RowSelection>>,
}
impl Iterator for ParquetRecordBatchReader {
type Item = ArrowResult<RecordBatch>;
fn next(&mut self) -> Option<Self::Item> {
- match self.array_reader.next_batch(self.batch_size) {
+ let to_read = match self.selection.as_mut() {
Review Comment:
👍 pass mask here not each col is more reasonable 😂
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