Module tuning 

Tuning module — resolution of SourceTuning from YAML + adaptive helpers.

Split into three concerns:

• [profile] — config types, three baked-in profiles, SourceTuning, ResourceSummary. The bulk of the module’s surface lives here.
• [memory] — pure schema-based memory estimation (estimate_row_bytes, [compute_batch_size_from_memory]).
• [adaptive] — live-feedback batch sizing (next_adaptive_batch_size + the ADAPTIVE_* constants).

All public symbols are re-exported at the module root so existing crate::tuning::SourceTuning / crate::tuning::estimate_row_bytes paths keep working.

Structs

SourceTuning

TuningConfig

Enums

BatchMemoryPolicy

Action taken when a single Arrow batch exceeds max_batch_memory_mb.

TuningProfile

Constants

ADAPTIVE_SAMPLE_INTERVAL

Number of batches between adaptive pressure samples.

Functions

estimate_row_bytes

Estimate average row size in bytes from an Arrow schema.

merge_tuning_config

Layer export on top of source: each field uses export when set, otherwise source. None only when both inputs are None.

next_adaptive_batch_size

Decide the next adaptive fetch size from current pressure state.