GitHub user kumarvishal09 opened a pull request:
https://github.com/apache/carbondata/pull/2985
[HOTFIX] Fixed Query performance issue
### Problem
When some pages is giving 0 rows, then also BlockletScanResult is
uncompressing all the pages. When compression is high and one blocklet contains
more number of pages in this case page uncompression is taking more time and
impacting query perfornace.
### Solution
Added check if number of record after filtering is 0 then no need to
uncompress that page
- [ ] Any interfaces changed?
- [ ] Any backward compatibility impacted?
- [ ] Document update required?
- [ ] Testing done
Please provide details on
- Whether new unit test cases have been added or why no new tests
are required?
- How it is tested? Please attach test report.
- Is it a performance related change? Please attach the performance
test report.
- Any additional information to help reviewers in testing this
change.
- [ ] For large changes, please consider breaking it into sub-tasks under
an umbrella JIRA.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kumarvishal09/incubator-carbondata
fixQueryPerf
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/carbondata/pull/2985.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 #2985
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commit 77474b31cfa984fd371870176eceb678f8cb1bb4
Author: kumarvishal09 <kumarvishal1802@...>
Date: 2018-12-13T06:10:18Z
Fixed Query performance issue
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