<transcript><audio_26>they differ from um read queries a little bit and then finally we're going to talk about expression evaluation so you can kind of have arbitrarily complex expressions or logic in your where clause project clause whatever but</transcript><transcript><audio_27>the idea is that we need a way to evaluate these arbitrarily complex expressions you know you could be doing adding things together modifying values from a column multiplications all these different things and then the comparisons that need to happen and and</transcript><transcript><audio_28>we need to be able to support um in conditions in our in our evaluation logic so uh let's start off with the processing model so basically a dbms's</transcript><transcript><audio_29>processing model tells us how the system is going to execute a particular query plan and maybe that sounds a little uh broad but kind of the the the high level idea is that there are different ways that we can implement uh passing</transcript><transcript><audio_30>results between different query operators we have each operator implemented in isolation and now we need to we need to move uh intermediate results between the operators so we're going to look at three different approaches here</transcript> they differ from um read queries a little bit and then finally we're going to talk about expression evaluation so you can kind of have arbitrarily complex expressions or logic in your where clause project clause whatever but the idea is that we need a way to evaluate these arbitrarily complex expressions you know you could be doing adding things together modifying values from a column multiplications all these different things and then the comparisons that need to happen and and we need to be able to support um in conditions in our in our evaluation logic so uh let's start off with the processing model so basically a dbms's processing model tells us how the system is going to execute a particular query plan and maybe that sounds a little uh broad but kind of the the the high level idea is that there are different ways that we can implement uh passing results between different query operators we have each operator implemented in isolation and now we need to we need to move uh intermediate results between the operators so we're going to look at three different approaches here
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