fix(query): surface DataFusion error detail and hint for reserved-wor…#8
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…d columns DataFusion lowercases unquoted SQL identifiers, so columns like ENDPERIOD, VARIABLE, or VALUE silently fail with a non-obvious "No field named" error. Replace the generic .context() wrapper with map_err to always surface the full DataFusion message, and add a double-quoting hint when the error is a field-not-found. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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…d columns
DataFusion lowercases unquoted SQL identifiers, so columns like ENDPERIOD, VARIABLE, or VALUE silently fail with a non-obvious "No field named" error. Replace the generic .context() wrapper with map_err to always surface the full DataFusion message, and add a double-quoting hint when the error is a field-not-found.