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From sounakr <...@git.apache.org>
Subject [GitHub] incubator-carbondata pull request #670: [CARBONDATA-792] Range Filter Optimi...
Date Sat, 18 Mar 2017 15:20:09 GMT
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
    
----
commit e77cc5a84e9d6313383cb6347f78846f3319442e
Author: sounakr <sounakr@gmail.com>
Date:   2017-03-15T16:06:16Z

    [CARBONDATA-792] Range Filter Optimization

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