WideTable: An Accelerator for Analytical Data Processing
In this paper the authors present a technique called WideTable that aims to improve the speed of analytical data processing systems. A WideTable is built by denormalizing the database, and then converting complex queries into simple scans on the underlying (wide) table. To avoid the pitfalls associated with denormalization, e.g. space overheads, WideTable uses a combination of techniques including dictionary encoding and columnar storage. When denormalizing the data, WideTable uses outer joins to ensure that queries on tables in the schema graph, which are now nested as embedded tables in the WideTable, are processed correctly.