Ryan Malloy
f3e589c5bf
Per-row decode is hit on every row of every SELECT. The original code had three forms of waste in the inner loop: 1. Redundant base_type() call. ColumnInfo.type_code is already base-typed by parse_describe at construction; calling base_type() again per column per row was pure waste. Single largest savings. 2. IntFlag->int conversions inline (~10x per iteration). Lifted to module-level _TC_X constants. 3. Lazy imports inside the loop body (_decode_datetime, _decode_interval, BlobLocator, ClobLocator, RowValue, CollectionValue). Moved to top. Plus three precomputed frozensets (_LENGTH_PREFIXED_SHORT_TYPES, _COMPOSITE_UDT_TYPES, _NUMERIC_TYPES) replace inline tuple-membership checks. _COLLECTION_KIND_MAP is now MappingProxyType (actually frozen). Performance: * parse_tuple_5cols: 2796 ns -> 2030 ns (-27%) * select_bench_table_all (1k rows): 1477 us -> 1198 us (-19%) * Codec micro-bench, cold connect, executemany: unchanged Real-world fetch ceiling on a single connection: 350K rows/sec -> 490K rows/sec. Margaret Hamilton review surfaced four cleanup items, all addressed before tagging: * H1: cursor._dereference_blob_columns had the same redundant base_type() call - stripped for consistency. * M1: documented the load-bearing invariant at parse_describe (the single producer site) so future contributors have a grep target. * M2: _COLLECTION_KIND_MAP wrapped in MappingProxyType. * L1: stale line-number comment fixed to point at the INVARIANT comment instead. baseline.json refreshed; all 224 integration tests pass; ruff clean.
1256 lines
43 KiB
JSON
1256 lines
43 KiB
JSON
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