{
    "action": "tool_call",
    "reasoning": "I've already identified the main categorical columns from step-7 (columns with rough_kind='categorical' or semantic_role='classifier'). Now I need to get the most common values and their frequencies for each of these categorical columns. I'll write a single SQL query that profiles all the key categorical columns at once, using UNION ALL to combine results from multiple columns across different tables.",
    "tool": "query_sql",
    "args": {
        "sql": "WITH top_values AS (SELECT 'job_logs.job_id' AS column_name, job_id AS value, COUNT(*) AS frequency FROM raw.job_logs WHERE job_id IS NOT NULL GROUP BY job_id ORDER BY COUNT(*) DESC LIMIT 10), phase_values AS (SELECT 'job_logs.phase' AS column_name, phase AS value, COUNT(*) AS frequency FROM raw.job_logs WHERE phase IS NOT NULL GROUP BY phase ORDER BY COUNT(*) DESC LIMIT 10), dataset_id_job AS (SELECT 'job_logs.dataset_id' AS column_name, dataset_id AS value, COUNT(*) AS frequency FROM raw.job_logs WHERE dataset_id IS NOT NULL GROUP BY dataset_id ORDER BY COUNT(*) DESC LIMIT 10), dataset_id_llm AS (SELECT 'llm_calls.dataset_id' AS column_name, dataset_id AS value, COUNT(*) AS frequency FROM raw.llm_calls WHERE dataset_id IS NOT NULL GROUP BY dataset_id ORDER BY COUNT(*) DESC LIMIT 10), table_name_tags AS (SELECT 'tag_lineage_edges.table_name' AS column_name, table_name AS value, COUNT(*) AS frequency FROM raw.tag_lineage_edges WHERE table_name IS NOT NULL GROUP BY table_name ORDER BY COUNT(*) DESC LIMIT 10), tag_values AS (SELECT 'column_tags.tag' AS column_name, tag AS value, COUNT(*) AS frequency FROM raw.column_tags WHERE tag IS NOT NULL GROUP BY tag ORDER BY COUNT(*) DESC LIMIT 10), purpose_values AS (SELECT 'llm_calls.purpose' AS column_name, purpose AS value, COUNT(*) AS frequency FROM raw.llm_calls WHERE purpose IS NOT NULL GROUP BY purpose ORDER BY COUNT(*) DESC LIMIT 10), function_values AS (SELECT 'job_logs.function_name' AS column_name, function_name AS value, COUNT(*) AS frequency FROM raw.job_logs WHERE function_name IS NOT NULL GROUP BY function_name ORDER BY COUNT(*) DESC LIMIT 10) SELECT * FROM top_values UNION ALL SELECT * FROM phase_values UNION ALL SELECT * FROM dataset_id_job UNION ALL SELECT * FROM dataset_id_llm UNION ALL SELECT * FROM table_name_tags UNION ALL SELECT * FROM tag_values UNION ALL SELECT * FROM purpose_values UNION ALL SELECT * FROM function_values ORDER BY column_name, frequency DESC",
        "purpose": "Profile the most common values and their frequencies across the main categorical columns identified in the dataset",
        "source": "raw"
    }
}