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Adds bidirectional adapter for BSL (https://github.com/boringdata/boring-semantic-layer), an Ibis-powered semantic layer with YAML configuration. Features: - Parse BSL expressions: _.column, _.count(), _.column.sum(), _.column.year() - Map BSL types to sidemantic: mean->avg, nunique->count_distinct - Handle time dimensions with is_time_dimension and smallest_time_grain - Support BSL joins with left_on/right_on syntax - Detect calc measures (derived metrics) - Full roundtrip: BSL -> Sidemantic -> BSL - Cross-format conversion: BSL <-> Cube, BSL <-> MetricFlow Files: - sidemantic/adapters/bsl_expr.py: Expression parser - sidemantic/adapters/bsl.py: Main adapter - sidemantic/loaders.py: Auto-detection for BSL format - tests/adapters/test_bsl.py: 55 unit tests - tests/adapters/test_bsl_roundtrip.py: 10 roundtrip tests - tests/fixtures/bsl/: Test fixtures
- README: Add BSL to formats list and adapters section - docs/adapters.qmd: Add BSL to supported formats table, feature compatibility matrix, usage example with roundtrip export, and import mapping section
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Summary
_.column.sum(),_.count(), etc.)load_from_directory()for BSL filesChanges
sidemantic/adapters/bsl.py- Main adapter with parse/exportsidemantic/adapters/bsl_expr.py- Expression parser for BSL Ibis syntaxsidemantic/loaders.py- BSL auto-detectiondocs/adapters.qmd- Documentation and compatibility tableREADME.md- Add BSL to formats list