GitHub user babokim opened a pull request:
https://github.com/apache/tajo/pull/70
TAJO-904: ORDER BY with a null column miss some data.
Currently Tajo ignores null value when calculates range partition range. I
added a MaxValueNull flag variable in ColumnStats. If ColumnStats's max value
is null, ColumnStats's max value is a non-null value and MaxValueNull flag is
true. So Repartitioner calculates range cardinality with non-null value.
Finally Repartitioner set null value to last range.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/babokim/tajo TAJO-904
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/70.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 #70
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commit 3acb265add415a9f4722935f9a69d6cd97b6f987
Author: ê¹íì¤ <[email protected]>
Date: 2014-07-14T03:31:21Z
TAJO-904: ORDER BY with a null column miss some data.
commit 89a35fd24bc7a8f9ab3ec7db0edfa5dad8e328a6
Author: ê¹íì¤ <[email protected]>
Date: 2014-07-14T03:31:59Z
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo
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