http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/when-plan-to-implemnt-merge-operation-tp13228p13395.html
implement this feature.
please other people give some comment also.
> merge example like this:
> small:
> id updatatime
> 1 9:00
> 2 8:00
> 6 9:00
>
> big:
> id updatetime
> 1 10:00
> 2 7:00
> 3 9:00
> 4 9:00
> 5 9:00
>
> as for record in small:
> id=1,small.update<big.update,do nothing;
> id=2,small.update>bigdate.update,update big;
> id=6,big doesn't have that record,insert big;
>
> for our solution:
> append all small record to big,
> big:
> id updatetime
> 1 10:00
> 2 7:00(to be delete)
> 3 9:00
> 4 9:00
> 5 9:00
> 1 9:00(to be deleted)
> 2 8:00
> 6 9:00
> then,for records in big which have the same id,max updatetime stays.
>
>
>
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