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CellReader

apiary_storage::cell_reader

Struct CellReader 

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pub struct CellReader { /* private fields */ }
Expand description

Reads Parquet cells from object storage into Arrow RecordBatches.

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impl CellReader

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pub fn new(storage: Arc<dyn StorageBackend>, frame_path: String) -> Self

Create a new CellReader.

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pub async fn read_cell( &self, cell: &CellMetadata, projection: Option<&[String]>, ) -> Result<Vec<RecordBatch>>

Read a single cell from storage. Returns all record batches in the cell.

If projection is Some, only the specified columns are read (projection pushdown).

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pub async fn read_cells( &self, cells: &[&CellMetadata], projection: Option<&[String]>, ) -> Result<Vec<RecordBatch>>

Read multiple cells and concatenate them into a single list of RecordBatches.

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pub async fn read_cells_merged( &self, cells: &[&CellMetadata], projection: Option<&[String]>, ) -> Result<Option<RecordBatch>>

Read cells and merge them into a single RecordBatch.

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