You can actually push all the processing to Redis with Lua without having to fetch a single "row" over the network... I'm not recommending this as a rule of thumb - on the contrary, you could easily tie down your (any type of) DB with application logic - but in some cases it makes sense.
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Redis supports filter features native, so it basically works as every remote service.
Do you mean HSCAN with MATCH? Thanks for reminding me about that. I think it's so limited that the point still stands though.
You can actually push all the processing to Redis with Lua without having to fetch a single "row" over the network... I'm not recommending this as a rule of thumb - on the contrary, you could easily tie down your (any type of) DB with application logic - but in some cases it makes sense.