I need to identify categorical columns and count their distinct values. Let me start by getting an overview of the dataset's columns to understand which ones are categorical. ```json { "action": "tool_call", "reasoning": "I need to identify categorical columns across all tables. The analytics.column_overview metadata will show me semantic_role and rough_kind for each column, which will help identify categorical columns. I'll query this to get a comprehensive view of all columns and their characteristics.", "tool": "query_sql", "args": { "sql": "SELECT table_name, column_name, phys_type, semantic_role, rough_kind, distinct_count, approx_distinct_count FROM analytics.column_overview WHERE rough_kind IN ('categorical', 'identifier') OR semantic_role IN ('category', 'identifier', 'flag') ORDER BY table_name, column_name", "purpose": "Identify all categorical columns across the dataset with their distinct counts", "source": "raw" } } ```