Re: IGNITE-3180 : please add support for median, stddev, var in Ignite SQL

[Ilya Kasnacheev <il...@gmail.com>]

Hello!

As far as my understanding goes, it's a very non-trivial thing to calculate
median across nodes.
You end up needing to pull all the data in one place or use some
complicated iterative approach.

Same thing probably applies to std, though there might be shortcuts. Still
it's not as easy as just implementing collocated algorithm.

Denis, should we probably delist aggregate functions that aren't supported?

Regards,
-- 
Ilya Kasnacheev


ср, 30 янв. 2019 г. в 13:25, mahesh76private <ma...@gmail.com>:

> The simple usecase is as follows
>
> In big data visualization, for drawing graphs, one needs to know the
> standard characteristics of a measure column (numeric column) to draw and
> plan out graphs.
>
>
> ideally, we need to this support in Ignite itself so that client code does
> not pull large columns (running in millions) to calculate the metric such
> as
> var, std, median, etc
>
>
>
>
>
> --
> Sent from: http://apache-ignite-users.70518.x6.nabble.com/
>