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From: Hanifi GUNES <hanifigunes@gmail.com>
Date: Fri, 20 May 2016 16:28:00 -0700
Message-ID: <CAHcC4n9B5KTEPt31z4k82x74L53OpzBmFXjPU70cOWcJHF49ZA@mail.gmail.com>
Subject: Re: How are Vectorization and Columnar execution implemented in Drill
To: dev <dev@drill.apache.org>
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archived-at: Fri, 20 May 2016 23:28:24 -0000

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Not sure if you have a more specific question but Drill basically relies on
an abstraction that we call Value Vectors. Take a look at [1]. The whole
execution relies on these columnar structs so no row-wise materialization
is done.


1: https://drill.apache.org/docs/value-vectors/

-Hanifi

2016-05-18 20:34 GMT-07:00 Yijie Shen <henry.yijieshen@gmail.com>:

> Hi folks,
>
> I'm new to Drill and find
> "Drill also provides an execution layer that performs SQL processing
> directly on columnar data without row materialization" and "vectorization
> in Drill allows the CPU to operate on vectors" on
> https://drill.apache.org/architecture/ page.
>
> I'm really curious about how these are implemented in Drill, after some
> search in the current code base, I could only find parquet files could be
> read in as vectors, how are these vectors handled then in `vectorized`
> manner? Could someone nicely point out where I can find more
> information/code on this?
>
> Thanks in advance.
>
> Yijie
>

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