- big_number.py pre_validate: add sql_expression branch; return
MISSING_SQL_METRIC_LABEL when label is absent/non-string, so the
existing unit tests (and LLM callers) get a clear actionable error.
- xy.py normalize_column_refs: skip entries with sql_expression set
(name is None for these metrics); previously crashed with
AttributeError: 'NoneType'.lower() in _get_canonical_column_name.
- test_big_number_chart.py: replace three calls to deleted
SchemaValidator._pre_validate_big_number_config with
plugin.pre_validate() via get_registry().
- test_runtime_validator.py: replace call to deleted
RuntimeValidator._validate_cardinality with XYChartPlugin.get_runtime_warnings;
patch FormatTypeValidator to isolate cardinality guard.
- test_update_chart.py: set mock_create_preview.return_value to a
3-tuple so the update_chart unpack doesn't crash; change RuntimeError
to ValueError which is in NORMALIZATION_EXCEPTIONS.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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