GitHub user jianqiao opened a pull request:
https://github.com/apache/incubator-quickstep/pull/244
Fix a problem in CopyGroupList + minor style fixes
This PR adjusts the implementation of `CopyGroupList::merge_contiguous()`
to handle some cases correctly.
E.g. let `R`be a split-row-store relation with integer attributes
`x`,`y`,`z`. It is expected that for query
```
SELECT x, y, z
FROM R;
```
`merge_contiguous()` merges all attributes into one `ContiguousAttrs` copy
group, with `bytes_to_copy` set to 12 (size of three integers).
It is also expected that for query
```
SELECT x, y, y
FROM R;
```
`merge_contiguous()` merges all attributes into two `ContiguousAttrs` copy
groups, one for `x, y` and one for the last `y`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/incubator-quickstep fix-copy-group
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/244.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 #244
----
commit 72c7703102f6c367fe346b6bdcde03f1f0036d7b
Author: Jianqiao Zhu <jianq...@cs.wisc.edu>
Date: 2017-05-03T04:55:52Z
Fix a problem in CopyGroupList + minor style fixes.
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