I need to identify categorical columns across the dataset and count their distinct values. Let me start by understanding what columns exist and their types. {"action": "tool_call", "reasoning": "First, I need to see what tables and columns exist in this dataset to identify categorical columns. The card shows 51 tables with 2M+ rows. I'll query the metadata to get a comprehensive view of all columns and their types, focusing on VARCHAR/TEXT columns which are typically categorical.", "tool": "query_sql", "purpose": "Get all columns with their types to identify categorical columns", "sql": "SELECT table_name, column_name, phys_type, semantic_role, rough_kind, distinct_count, approx_distinct_count FROM analytics.column_overview WHERE phys_type IN ('VARCHAR', 'TEXT') ORDER BY table_name, column_name"}