Constant mz_persist_client::cfg::COMPACTION_HEURISTIC_MIN_PARTS

pub const COMPACTION_HEURISTIC_MIN_PARTS: Config<usize>;

In Compactor::compact_and_apply, we do the compaction (don’t skip it) if the number of batch parts is at least this many. Compaction is performed if any of the heuristic criteria are met (they are OR’d).