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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| use super::*; | ||
| use crate::mmap::MmapBytesReader; | ||
| use crate::utils::apply_projection; | ||
| use arrow::chunk::Chunk; | ||
| use arrow::io::ipc::read; | ||
| use arrow::io::ipc::read::{Dictionaries, FileMetadata}; | ||
| use arrow::mmap::{mmap_dictionaries_unchecked, mmap_unchecked}; | ||
| use memmap::Mmap; | ||
|
|
||
| struct MMapChunkIter<'a> { | ||
| dictionaries: Dictionaries, | ||
| metadata: FileMetadata, | ||
| mmap: Arc<Mmap>, | ||
| idx: usize, | ||
| end: usize, | ||
| projection: &'a Option<Vec<usize>>, | ||
| } | ||
|
|
||
| impl<'a> MMapChunkIter<'a> { | ||
| fn new(mmap: Mmap, metadata: FileMetadata, projection: &'a Option<Vec<usize>>) -> Result<Self> { | ||
| let mmap = Arc::new(mmap); | ||
|
|
||
| let end = metadata.blocks.len(); | ||
| // mmap the dictionaries | ||
| let dictionaries = unsafe { mmap_dictionaries_unchecked(&metadata, mmap.clone())? }; | ||
|
|
||
| Ok(Self { | ||
| dictionaries, | ||
| metadata, | ||
| mmap, | ||
| idx: 0, | ||
| end, | ||
| projection, | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| impl ArrowReader for MMapChunkIter<'_> { | ||
| fn next_record_batch(&mut self) -> ArrowResult<Option<ArrowChunk>> { | ||
| if self.idx < self.end { | ||
| let chunk = unsafe { | ||
| mmap_unchecked( | ||
| &self.metadata, | ||
| &self.dictionaries, | ||
| self.mmap.clone(), | ||
| self.idx, | ||
| ) | ||
| }?; | ||
| self.idx += 1; | ||
| let chunk = match &self.projection { | ||
| None => chunk, | ||
| Some(proj) => { | ||
| let cols = chunk.into_arrays(); | ||
| let arrays = proj.iter().map(|i| cols[*i].clone()).collect(); | ||
| Chunk::new(arrays) | ||
| } | ||
| }; | ||
| Ok(Some(chunk)) | ||
| } else { | ||
| Ok(None) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<R: MmapBytesReader> IpcReader<R> { | ||
| pub(super) fn finish_memmapped( | ||
| &self, | ||
| predicate: Option<Arc<dyn PhysicalIoExpr>>, | ||
| aggregate: Option<&[ScanAggregation]>, | ||
| ) -> Result<DataFrame> { | ||
| match self.reader.to_file() { | ||
| Some(file) => { | ||
| let mmap = unsafe { memmap::Mmap::map(file).unwrap() }; | ||
| let metadata = read::read_file_metadata(&mut std::io::Cursor::new(mmap.as_ref()))?; | ||
|
|
||
| let schema = if let Some(projection) = &self.projection { | ||
| apply_projection(&metadata.schema, projection) | ||
| } else { | ||
| metadata.schema.clone() | ||
| }; | ||
|
|
||
| let reader = MMapChunkIter::new(mmap, metadata, &self.projection)?; | ||
|
|
||
| finish_reader( | ||
| reader, | ||
| // don't rechunk, that would trigger a read. | ||
| false, | ||
| self.n_rows, | ||
| predicate, | ||
| aggregate, | ||
| &schema, | ||
| self.row_count.clone(), | ||
| ) | ||
| } | ||
| None => Err(PolarsError::ComputeError( | ||
| "Cannot memory map, you must provide a file".into(), | ||
| )), | ||
| } | ||
| } | ||
| } |
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