GitHub user sounakr opened a pull request:
https://github.com/apache/incubator-carbondata/pull/670
[CARBONDATA-792] Range Filter Optimization
Problem : LessThan and GreaterThan Expression are merged into a single
RANGE expression.
Analysis : If LessThan and GreaterThan Expression on a same column given as
filter predicates, then each expression is evaluated independently and finally
AND operator is applied on individual results to get the final output.
Fix : If the LessThan and GreaterThan Expression values can form a Range
then it is Converted into a RANGE expression and results are evaluated through
single expression. I.e. if the value lies within Range then choosen. This fix
will optimize Block Prunning and Reduce Scanning time in case queries have
range expressions in filter.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sounakr/incubator-carbondata range1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-carbondata/pull/670.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 #670
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commit e77cc5a84e9d6313383cb6347f78846f3319442e
Author: sounakr <soun...@gmail.com>
Date: 2017-03-15T16:06:16Z
[CARBONDATA-792] Range Filter Optimization
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