GitHub user jianqiao opened a pull request:
https://github.com/apache/incubator-quickstep/pull/201
Fix a bug with SelectOperator
This PR fixes a bug that `SELECT ... LIMIT n;` may output more than `n`
rows.
The cause is that `SortMergeRunOperator` creates two relations, where one
relation is the output relation to a `SelectOperator` and the other is a
_temporary_ relation. However, the generated blocks of the temporary relation
are also fed into the `SelectOperator` via a _DataPipelineMessage_ -- thus we
need to check that the input block to a `SelectOperator` is actually from its
input relation.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/incubator-quickstep fix-select
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/201.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 #201
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commit e896b61d1932d4593cb18033fe4da23a5e238f77
Author: jianqiao <jianq...@cs.wisc.edu>
Date: 2017-03-01T19:16:47Z
Fix a bug with SelectOperator
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