{
    "action": "tool_call",
    "reasoning": "I need to find the number of distinct values for the categorical (VARCHAR) columns in the raw.Iris table: Species, _batch_id, _source_file, and _source_system.",
    "tool": "query_sql",
    "args": {
        "purpose": "Count distinct values for categorical columns",
        "source": "raw",
        "sql": "SELECT COUNT(DISTINCT Species) AS distinct_species, COUNT(DISTINCT _batch_id) AS distinct_batch_id, COUNT(DISTINCT _source_file) AS distinct_source_file, COUNT(DISTINCT _source_system) AS distinct_source_system FROM raw.Iris;"
    }
}