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

    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.

    Any thoughts, comments and questions ?

Best Regards
David QiangCai



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