Revision a406473a525285888dbc29503443173df1d1c490 authored by Wang Gengliang on 27 September 2017, 15:40:31 UTC, committed by Herman van Hovell on 27 September 2017, 15:40:31 UTC
Back port https://github.com/apache/spark/pull/19362 to branch-2.2
## What changes were proposed in this pull request?
When inferring constraints from children, Join's condition can be simplified as None.
For example,
```
val testRelation = LocalRelation('a.int)
val x = testRelation.as("x")
val y = testRelation.where($"a" === 2 && !($"a" === 2)).as("y")
x.join.where($"x.a" === $"y.a")
```
The plan will become
```
Join Inner
:- LocalRelation <empty>, [a#23]
+- LocalRelation <empty>, [a#224]
```
And the Cartesian products check will throw exception for above plan.
Propagate empty relation before checking Cartesian products, and the issue is resolved.
## How was this patch tested?
Unit test
Author: Wang Gengliang <ltnwgl@gmail.com>
Closes #19366 from gengliangwang/branch-2.2.
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| pkg | ||
| .gitignore | -rw-r--r-- | 66 bytes |
| CRAN_RELEASE.md | -rw-r--r-- | 3.2 KB |
| DOCUMENTATION.md | -rw-r--r-- | 474 bytes |
| README.md | -rw-r--r-- | 3.5 KB |
| WINDOWS.md | -rw-r--r-- | 2.2 KB |
| check-cran.sh | -rwxr-xr-x | 2.4 KB |
| create-docs.sh | -rwxr-xr-x | 1.8 KB |
| create-rd.sh | -rwxr-xr-x | 1.5 KB |
| find-r.sh | -rwxr-xr-x | 1.2 KB |
| install-dev.bat | -rw-r--r-- | 1.1 KB |
| install-dev.sh | -rwxr-xr-x | 1.6 KB |
| install-source-package.sh | -rwxr-xr-x | 2.0 KB |
| log4j.properties | -rw-r--r-- | 1.3 KB |
| run-tests.sh | -rwxr-xr-x | 2.3 KB |
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