lszskye opened a new pull request, #46: URL: https://github.com/apache/paimon-cpp/pull/46
## feat: add batch reader infrastructure ### Changes #### `BatchReader` - Abstract base class for reading batch data into Arrow arrays. Supports `NextBatch()` returning `ArrowArray` + `ArrowSchema`, and `NextBatchWithBitmap()` returning batches with a validity bitmap for efficient deletion vector and index filtering. Provides EOF detection and reader metrics. #### `FileBatchReader` - Extends `BatchReader` for single-file reading scenarios. Adds `SetReadSchema()` for dynamic schema/predicate reconfiguration, `GetFileSchema()`, `GetPreviousBatchFirstRowNumber()`, `GetNumberOfRows()`, and `SupportPreciseBitmapSelection()` for bitmap-based row selection. #### `PrefetchFileBatchReader` - Extends `FileBatchReader` with prefetch capabilities. #### `CompleteRowKindBatchReader` - `BatchReader` wrapper that prepends a `_VALUE_KIND` column (int8 array of `RowKind` values) to each output batch. #### `ConcatBatchReader` - Concatenates a list of `BatchReader` instances and reads them sequentially. #### `DelegatingPrefetchReader` - `FileBatchReader` adapter that wraps a `PrefetchFileBatchReaderImpl`. Transparently delegates to the prefetch reader or its first underlying reader based on whether prefetching is needed. #### `PredicateBatchReader` - `BatchReader` wrapper that applies a `Predicate` filter to each batch. #### `ReaderUtils` - Static utility class. ### Tests - `CompleteRowKindBatchReaderTest` - `ConcatBatchReaderTest` - `PredicateBatchReaderTest` - `ReaderUtilsTest` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
