<invoke name="query_sql"> <parameter name="sql">SELECT column_name, phys_type, semantic_role, rough_kind, null_count, distinct_count, min_value, max_value FROM analytics.column_overview WHERE table_name = 'iris'</parameter> <parameter name="purpose">List columns of raw.iris with data types, roles, and basic stats</parameter> <parameter name="source">raw</parameter> </invoke> ``` <invoke name="final"> </invoke>