A first numerical value is obtained based on a first data source. The first numerical value is stored in a tree structure according to a precision by storing an exponent for the first numerical value in an exponential node of the tree structure and storing respective significant figure digits of the first numerical value in respective regular nodes of the tree structure. Information is computed for nodes in the tree structure. The information includes one or more of statistics, metrics, or histogram information. The computed information is employed to respond to a query related to the data source.