> 在 2017年4月5日,下午6:31,QiangCai <
[hidden email]> 写道:
>
> Hi all,
>
> Now we plan to implement delta encoding for the numeric type column in
> SORT_COLUMNS.
>
> 1. use delta encoding to encode the numeric type data
>
I think the adaptive data type conversion still apply here, right?
> 2. write present metadata to the page header, to record the null value.
>
> 3. improve the compression on no-dictionary string column.
> use RLE to compress the array of the lengths in LV encoding.
>
I think local dictionary is more suitable for this case
> Any thoughts, comments and questions ?
>
> Best Regards
> David QiangCai
>
>
> --
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