{
    "action": "tool_call",
    "reasoning": "I need to confirm the exact time period (min and max years) covered by the dataset to answer the user's question accurately.",
    "tool": "query_sql",
    "args": {
        "purpose": "Find the minimum and maximum YearNum in both tables to determine the time period covered.",
        "source": "raw",
        "sql": "SELECT 'Men (ittf_rankings)' as table_name, MIN(YearNum) as min_year, MAX(YearNum) as max_year FROM raw.ittf_rankings\nUNION ALL\nSELECT 'Women (ittf_rankings_women)' as table_name, MIN(YearNum) as min_year, MAX(YearNum) as max_year FROM raw.ittf_rankings_women;"
    }
}