feat: emit tagged predicate edges for JOIN ON clause columns#62
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JOIN ON predicate columns (e.g., temporal range joins, equi-join keys) previously produced zero column-lineage edges, making them invisible in impact analysis. This adds is_join_predicate=True edges from ON-clause columns to projected output columns from the joined table, with join_condition and join_side metadata. Supports equi-joins, range/BETWEEN, function-wrapped keys, multi-join chains, and composes with Gap 4 self-read nodes for self-referencing pipelines. Closes Gap 7 from the CDC/SCD pipeline gap analysis.
…dicates Two new example notebooks demonstrating Gap 4 and Gap 7 features: - self_referencing_lineage.ipynb: Single-statement self-ref, SCD2 MERGE+INSERT, impact analysis through self-read chains, edge annotations - join_predicate_lineage.ipynb: Equi-join predicates, point-in-time BETWEEN joins, multi-join chain scoping, impact analysis with predicate filtering
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Summary
is_join_predicate=Trueedges to projected output columns from the joined tablejoin_condition(raw ON-clause SQL) andjoin_side("left"/"right") for filtering and analysisCloses Gap 7 from the CDC/SCD pipeline gap analysis (
docs/superpowers/specs/2026-04-13-gap7-join-predicate-columns-design.md).Files Changed
models.pyJoinPredicateInfodataclass,join_predicatesonQueryUnit,is_join_predicate/join_condition/join_sideonColumnEdgequery_parser.py_parse_select_unit,_extract_join_predicate_columns,_get_join_type,_get_join_right_tablelineage_builder.py_create_join_predicate_edges,_resolve_join_predicate_column(step 9 in_process_unit)pipeline_lineage_builder.py_add_query_edgesexplicit copy listtest_join_predicate_columns.pytest_unqualified_column_resolution.pyTest plan
tests/test_join_predicate_columns.py)