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Chris Lu
e1a09416fc
Wire the parser, cache, and Loader through the Service: - Options gains Loader and Cache (with CacheSize fallback). Defaults to LocalLoader and a footer-cache of defaultFooterCacheSize entries. - Pushdown handles the predicate-less, no-vector path by parsing each DataFile's footer (cached by Identity = (Path, SizeBytes, RecordCount, ETag)) and emitting one FileRange per (data file, row group, projected column) triple. Predicate / vector requests still return Unimplemented with stats. - statsRecorder gains per-request footer cache hit/miss counters that populate PushdownStats.footer_cache_hits / footer_cache_misses. - Column projection matches by ColumnRef.Path. Field-id-only refs return InvalidArgument until M3 (catalog-validated mode) plumbs the Iceberg schema through; the path-hint fallback is enough for the M1 round-trip test. Daemon supplies LocalLoader for now; the filer-backed Loader lands when M2+ needs it. Update the M0 Unimplemented test to send a predicate so it exercises the still-Unimplemented branch (file/range-level pushdown is now implemented for the no-predicate case).