I need to provide a comprehensive list of all columns across the dataset with their data types and meanings. Let me start by getting an overview of the tables and their columns. ```json { "action": "tool_call", "reasoning": "The question asks for columns, data types, and meanings across the entire dataset. I'll start by querying the metadata to get a complete list of all columns with their physical types and semantic roles, which will give me the data types and meanings.", "tool": "query_sql", "args": { "sql": "SELECT table_name, column_name, phys_type, semantic_role, rough_kind FROM meta.columns ORDER BY table_name, column_name", "purpose": "Get all columns with their data types and semantic meanings across all tables", "source": "raw" } } ```