13. A computer system comprising: one or more processors; a software program, executable on said computer system, the software program configured to: provide an engine in communication with a re-written query plan and with an interface, the re-written query plan resulting from application of a query plan re-write rule to a previous query plan; cause an engine to reference the re-written query plan in order to generate a visualization comprising a graph including an operation node and a table node; and cause the engine to communicate the visualization to the interface for display in a dashboard further comprising the previous query plan, wherein the dashboard further includes a change log separate from the graph and reflecting changes to the re-written query plan in a format comprising an identifier of the operation node, an operation type, an updated parent node identifier, and an identifier of the query plan re-write rule.
13. A computer system comprising: one or more processors; a software program, executable on said computer system, the software program configured to: provide an engine in communication with a re-written query plan and with an interface, the re-written query plan resulting from application of a query plan re-write rule to a previous query plan; cause an engine to reference the re-written query plan in order to generate a visualization comprising a graph including an operation node and a table node; and cause the engine to communicate the visualization to the interface for display in a dashboard further comprising the previous query plan, wherein the dashboard further includes a change log separate from the graph and reflecting changes to the re-written query plan in a format comprising an identifier of the operation node, an operation type, an updated parent node identifier, and an identifier of the query plan re-write rule. 16. A computer system as in claim 13 wherein the dashboard further includes cost information.