Re: [Discussion] Carbon Local Dictionary Support

Posted by bhavya411 on Jun 07, 2018; 1:54pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/Discussion-Carbon-Local-Dictionary-Support-tp51447p51590.html

Hi Vishal,

Thanks for sharing the design and I have one question related to deciding
on whether to generate the dictionary or not. If in first few loads we have
the cardinality below the threshold then we will create a local dictionary,
but if in subsequent loads the threshold value is breached than what will
happen to the data of previous loads?

Regards
Bhavya

On Thu, Jun 7, 2018 at 5:28 PM, xuchuanyin <[hidden email]> wrote:

> About query filtering
>
> 1. “during filter, actual filter values will be generated using column
> local
> dictionary values...then filter will be applied on the dictionary encode
> data”
> ---
> If the filter is not 'equal' but 'like','greater than', can it also run on
> encode data.
>
> 2. "As dictionary data will be always of 4 bytes "
> ---
> Why they are 4 bytes?
>
>
>
> --
> Sent from: http://apache-carbondata-dev-mailing-list-archive.1130556.
> n5.nabble.com/
>

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