test(conformance): gate-1 spike — struct-bbox leaf row-group stats (s04)#5
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…ats (PyArrow emit + parquet read)
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Milestone alden-feedback step s04 (P5 GATE 1, linchpin). Proves PyArrow emits Parquet row-group min/max statistics on the LEAF fields of a struct
bboxcolumn {xmin,ymin,xmax,ymax} and the Rust parquet crate reads them. Adds a reusable verifier + a Rust leaf-stats test; canonical fixtures/validator UNCHANGED (s06/s07 own those). Verdict: GO — leaf stats emit naturally viapa.StructArray.from_arrays. Constraint for s07: leafname()collapses toxmin, so stats must match oncolumn(i).path().string() == 'bbox.xmin'. Plan: planning/milestone-alden-feedback/s04/plan.md.