Postgres(hereinafter mentioned as PG) is a pretty cool database with lots of nice features, one of them little known ones is the ability of having Foreign data wrappers (hereinafter mentioned as FDWs). Clickhouse(hereinafter mentioned as CH) is another amazing database with an altogether different set of features targeted for OLAP use cases. What are Foreign Data Wrappers (FDWs) then? Well unlike so many names in tech, we can actually infer some idea from the name itself in this case.
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