{
    "action": "tool_call",
    "reasoning": "Categorical columns are likely company_name, stock_name, _batch_id, _source_file, _source_system. Compute distinct counts in one query.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(DISTINCT company_name) AS company_name_distinct, COUNT(DISTINCT stock_name) AS stock_name_distinct, COUNT(DISTINCT _batch_id) AS batch_id_distinct, COUNT(DISTINCT _source_file) AS source_file_distinct, COUNT(DISTINCT _source_system) AS source_system_distinct, COUNT(*) AS total_rows FROM raw.semi_conductor_se",
        "purpose": "Distinct counts of all text/categorical columns",
        "source": "raw"
    }
}