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fix(type-inference)!: follow nested struct field references - #294
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WalkthroughDirect-reference type inference now traverses nested struct fields, list elements, and map values. It validates container types, struct-field bounds, and map-key literal types. Tests cover nested selections, nullability, invalid paths, and collection-access output types. ChangesNested direct-reference type inference
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Low Suggested reviewers: Merge Risk: ⚪ Minimal · up to Type inference now returns the terminal field type for nested references and rejects invalid paths. This is the stated behavior change. No actionable merge-blocking risk was identified in the supplied context. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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nielspardon
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Thanks, this fixes #293 nicely. One regression to sort out before merge: a struct field whose child is a list_element or map_key now raises, which breaks col("xs")[0] and .map_key(...) in the DataFrame API — see inline.
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Review comments at @src/substrait/type_inference.py:
- Around line 665-669: In the map_key branch of infer_expression_type, validate
the inferred type of segment.map_key against result.map.key and reject
incompatible keys before assigning result.map.value. Preserve the existing
map-kind check and value-type selection for compatible keys.
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src/substrait/type_inference.pytests/dataframe/test_frame.pytests/test_type_inference.py
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nielspardon
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Thanks — the list and map handling looks good. One side effect of the strict map-key check: col("m").map_key(7) on a map whose key isn't i64 now raises, because Expr.map_key always builds an i64 literal. That's a builder issue rather than a problem with this PR, so I've filed #295 for it.
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Follow child reference segments for row, outer and lambda references, returning the selected struct field, list element or map value type as specified by Substrait v0.101.0.
Closes #293
BREAKING CHANGE: Nested struct references now infer the terminal field type instead of the outer struct. Invalid field paths are rejected.