GH-48986: [C++][Dataset] Add ORC stripe statistics extraction foundation (1/15) #49009
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Add internal utilities for extracting min/max statistics from ORC stripe metadata. This establishes the foundation for statistics-based stripe filtering in predicate pushdown. Changes: - Add MinMaxStats struct to hold extracted statistics - Add ExtractStripeStatistics() function for INT64 columns - Statistics extraction returns std::nullopt for missing/invalid data - Validates statistics integrity (min <= max) This is an internal-only change with no public API modifications. Part of incremental ORC predicate pushdown implementation (PR1/15).
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Summary
Part 1/15 of ORC predicate pushdown implementation.
Adds foundation for statistics-based predicate pushdown:
GetStripeStatistics()API to ORCFileReaderThis is the first building block that enables stripe filtering based on column statistics.
Changes
adapter.h: Add GetStripeStatistics APIadapter.cc: Implement statistics retrievalRationale
ORC files store min/max statistics at the stripe level. This API exposes those statistics to enable predicate pushdown at the Dataset API layer, following the same pattern as Parquet row group statistics.
Part of stacked PR series for ORC predicate pushdown.