GitHub user mayunSaicmotor opened a pull request:
https://github.com/apache/incubator-carbondata/pull/732
[CARBONDATA-754] improve performance when order by prefix columns of mdk +
limit
the improvement scenario is for order by prefix columns of mdk + limit
the logical is to leverage the mdk sort feature to get the sorted data.
The performance is much better.
for example, order by prefix columns of mdk + limit on 20,000,000 data,
the performance can be from 10s to about 1s.
if do not want to use this feature, can also set
CarbonCommonConstants.ORDER_BY_MDK_OPTIMIZATION_FLG = false.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mayunSaicmotor/incubator-carbondata
orderby-mdk
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-carbondata/pull/732.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #732
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