Re: [DISCUSSION] Optimizing the writing of min max for a column

Posted by xuchuanyin on Sep 18, 2018; 1:26am
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/DISCUSSION-Optimizing-the-writing-of-min-max-for-a-column-tp62515p62686.html

Hi manish, after reviewing your PR, I do come across another idea of
implementing this feature：

I'd like to use an unique `FAKE` value to store the minmax for those
columns.
While judging the filter value with the fake minmax, we know that is a fake
minmax, so the filter procedure just returns true.
In this way, we do not need to modify the metadata and can reduce many code
changes.

BTW, It seems the we already use a unique value for 'NULL' during
converting, so I think a unique value for fake minmax is acceptable.


How do you think about it?



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