Query processing visualization system and method of visualizing query processing

A query processing visualization system comprises a visualization module. The visualization module visualizes logging information of query processing events occurring during processing of a client query requesting data from one or more data sources by analyzing the logging information to identify dependency of the query processing events, formatting visual presentation components representing the logging information in a hierarchy to reflect the dependency of the query processing events, and presenting the visual presentation components in the context of the hierarchy of the visual components as formatted.