Assume you need to execute the following query: SELECT SUM(A) FROM MyTable For large tables it will take some time to compute the result. Now assume we ap

Assume you need to execute the following query: SELECT SUM(A) FROM MyTable For large tables it will take some time to compute the result. Now assume we append a new record and want to get the new result. The traditional approach is execute this query again. A better approach is to process this new record only by adding its value in A to the result of the previous query. It is important in (stateful) stream processing. Something similar is implemented in these libraries which however rely on a different data processing conception (alternative to map-reduce): https://github.com/asavinov/prosto https://github.com/asavinov/prosto - Functions matter! No join-groupby, No map-reduce. https://github.com/asavinov/lambdo https://github.com/asavinov/lambdo - Feature engineering and machine learning: together at last!