MarvinLitt edited a comment on pull request #4189:
URL: https://github.com/apache/carbondata/pull/4189#issuecomment-898145409
> can we check why "overwrite data" is much slower than "load data"?
it is obviously， overwrite need to check the data in segments, load do not
need, they have great differences.
In principle, there is a huge performance gap between overwrite and load.
if use insert overwrite table from select * from another, need to load
csv data as temp table, and select all data, all of that may take more time.
this scenarios is very special，the performance is key poit.
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