1. A system, comprising: a processor programmed to initiate executable operations comprising: requesting from a database management system a first execution plan for a first version of a structured query language statement; loading the first execution plan for the first version of the structured query language statement into a first directed graph tree structure comprising a plurality of nodes, wherein the plurality of nodes comprise at least one intermediate node, the intermediate node representing intermediate results of a query process contained in the first execution plan; scanning the first directed graph tree structure to determine whether a full table scan for accessing requested data is represented by at least a one of the plurality of nodes of the directed graph tree structure and to determine a cost incurred by the intermediate results of the query process represented by the intermediate node; and responsive to determining that the full table scan for accessing the requested data is represented by the at least one of the plurality of nodes of the directed graph tree structure, outputting a first indicator that indicates a fault condition and a second indicator that indicates the cost incurred by the intermediate results of the query process represented by the intermediate node.