Re: [Discussion] Carbon Local Dictionary Support

Posted by akashrn5 on Jun 08, 2018; 7:05am
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/Discussion-Carbon-Local-Dictionary-Support-tp51447p51629.html

Hi xuchuanyin,

Please find my comments inline

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.

*For range type of filters , it will be same as the way global dictionary
column is handled.*

2. "As dictionary data will be always of 4 bytes "
---
Why they are 4 bytes?

*Dictionary value/data is nothing but integer value assigned to the
dictionary key. So it will of 4 bytes.*





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