GitHub user zuyu opened a pull request:
https://github.com/apache/incubator-quickstep/pull/271
QUICKSTEP-95: Fixed the exception due to zero tuple estimation for thâ¦
â¦e empty project expression.
The problem is that
[tuple_slot_bytes_](https://github.com/apache/incubator-quickstep/blob/master/storage/SplitRowStoreTupleStorageSubBlock.cpp#L128)
is ZERO if the project expression is empty, and
[later](https://github.com/apache/incubator-quickstep/blob/master/storage/SplitRowStoreTupleStorageSubBlock.cpp#L142)
results in a divide-by-zero exception.
It is easy to reproduce:
```
$ create table r (a int, b char(20));
$ insert into r values(1, 'madison');
$ create table s (a int, c float);
$ select s.a from r, s where r.a > 0;
```
```
I0619 18:26:45.097215 1944100864 PhysicalGenerator.cpp:196] Optimized
physical plan:
TopLevelPlan
+-plan=NestedLoopsJoin
| +-left=Selection
| | +-input=TableReference[relation=r]
| | | +-AttributeReference[id=0,name=a,relation=r,type=Int]
| | | +-AttributeReference[id=1,name=b,relation=r,type=Char(20)]
| | +-filter_predicate=Greater
| | | +-AttributeReference[id=0,name=a,relation=r,type=Int]
| | | +-Literal[value=0,type=Int]
| | +-project_expressions=
| | +-[]
| +-right=TableReference[relation=s]
| | +-AttributeReference[id=2,name=a,relation=s,type=Int]
| | +-AttributeReference[id=3,name=c,relation=s,type=Float]
| +-join_predicate=Literal[value=true]
| +-project_expressions=
| +-AttributeReference[id=2,name=a,relation=s,type=Int]
+-output_attributes=
+-AttributeReference[id=2,name=a,relation=s,type=Int]
```
Floating point exception: 8
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zuyu/incubator-quickstep quickstep-95
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/271.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 #271
----
commit 6ced931251f76e977ab1bae94e91bb75103e26c4
Author: Zuyu Zhang <zu...@apache.org>
Date: 2017-06-19T20:53:52Z
QUICKSTEP-95: Fixed the exception due to zero tuple estimation for the
empty project expression.
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