I need to check the actual columns in the dataset to properly query for missing values. Let me inspect the table structure first. ```json { "action": "tool_call", "reasoning": "The previous query returned 0 rows, which means either there are no missing values or the query didn't target the right table. I need to inspect the actual columns in the raw.polling_on_ai_usage_jul_2026 table to understand its structure and then query for null counts properly.", "tool": "inspect_columns", "args": { "table": "raw.polling_on_ai_usage_jul_2026" } } ```