{
    "action": "tool_call",
    "reasoning": "Count distinct values for the categorical (VARCHAR) columns in one query over raw.iris.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS row_count, COUNT(DISTINCT species) AS species_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 FROM raw.iris",
        "purpose": "Count distinct values for all VARCHAR (categorical) columns in one query",
        "source": "raw"
    }
}