{
    "action": "tool_call",
    "reasoning": "The previous query failed because Amount and Valuation contain 'n/a' values that cannot be cast to DECIMAL. I can see from inspect_columns that Amount ranges from $1,000,000,000 to $6,500,000,000 and Valuation ranges from empty string to 'na'. I need to handle these non-numeric values by filtering them out before casting. I'll write a query that uses CASE statements to safely convert these VARCHAR columns to numeric types, excluding 'n/a', 'na', and empty strings.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) as total_rows, COUNT(CASE WHEN \"Amount\" NOT IN ('n/a', 'na', '') THEN 1 END) as amount_valid_count, MIN(CASE WHEN \"Amount\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Amount\", '$', ''), ',', '') AS DECIMAL) END) as amount_min, MAX(CASE WHEN \"Amount\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Amount\", '$', ''), ',', '') AS DECIMAL) END) as amount_max, AVG(CASE WHEN \"Amount\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Amount\", '$', ''), ',', '') AS DECIMAL) END) as amount_mean, MEDIAN(CASE WHEN \"Amount\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Amount\", '$', ''), ',', '') AS DECIMAL) END) as amount_median, STDDEV(CASE WHEN \"Amount\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Amount\", '$', ''), ',', '') AS DECIMAL) END) as amount_stddev, COUNT(CASE WHEN \"Valuation\" NOT IN ('n/a', 'na', '') THEN 1 END) as valuation_valid_count, MIN(CASE WHEN \"Valuation\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Valuation\", '$', ''), ',', '') AS DECIMAL) END) as valuation_min, MAX(CASE WHEN \"Valuation\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Valuation\", '$', ''), ',', '') AS DECIMAL) END) as valuation_max, AVG(CASE WHEN \"Valuation\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Valuation\", '$', ''), ',', '') AS DECIMAL) END) as valuation_mean, MEDIAN(CASE WHEN \"Valuation\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Valuation\", '$', ''), ',', '') AS DECIMAL) END) as valuation_median, STDDEV(CASE WHEN \"Valuation\" NOT IN ('n/a', 'na', '') THEN CAST(REPLACE(REPLACE(\"Valuation\", '$', ''), ',', '') AS DECIMAL) END) as valuation_stddev FROM \"raw\".\"Largest US Venture Funding Deals Of 2023\"",
        "purpose": "Calculate distribution statistics (min, max, mean, median, stddev) for Amount and Valuation columns, handling non-numeric values like 'n/a' and 'na'"
    }
}