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El proceso de crear tablas intermedias especializadas para facilitar las uniones entre diferentes conjuntos de datos.
Distinto de las operaciones de unión de tablas: Se centra en la generación de la estructura de unión en sí misma en lugar del acto de fusionar filas.
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This project is a high-performance tabular data processing framework for R, designed to handle massive datasets with memory efficiency and speed. It provides an enhanced data structure that utilizes reference semantics and in-place modification to perform complex transformations without the overhead of unnecessary object copying. The library distinguishes itself through its low-level architectural optimizations, including multi-threaded parallel processing, radix-based sorting, and memory-mapped file parsing. By offloading critical data manipulation and aggregation routines to compiled C code
Creates specialized table objects to specify the columns used for matching records during a join.