This is more of a question for the connector. It depends on how the connector is implemented. Some implements aggregate pushdown, but most don't.
On Mon, Mar 18, 2019 at 10:05 AM, asma zgolli < zgollia...@gmail.com > wrote: > > Hello, > > > I'm executing using spark SQL an SQL workload on data stored in MongoDB. > > > i have a question about the locality of execution of the aggregation. I m > wondering if the aggregation is pushed down to MongoDB (like pushing down > filters and projection) or executed in spark. I m displaying the physical > plan in spark, this plan includes hashaggregation operators but in the log > of my MongoDB server the execution plan has pipelines for aggregation. > > > I am really confused. thank you very much for your answers. > yours sincerely > Asma ZGOLLI > > > PhD student in data engineering - computer science > > Email : zgolliasma@ gmail. com ( zgollia...@gmail.com ) > email alt: asma. zgolli@ univ-grenoble-alpes. fr ( zgollia...@gmail.com ) >
