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| author | Herman van Hovell <hvanhovell@questtec.nl> | 2016-05-10 12:47:31 -0700 |
|---|---|---|
| committer | Yin Huai <yhuai@databricks.com> | 2016-05-10 12:47:31 -0700 |
| commit | d28c67544b26c38d51a31d1f8dac3fc23860e1ef (patch) | |
| tree | ccf2d39c55bf8e2c25177f470c1c4c839bb411f1 /.travis.yml | |
| parent | 89f73f674126bbc1cc101f0f5731b5750f1c90c8 (diff) | |
| download | spark-d28c67544b26c38d51a31d1f8dac3fc23860e1ef.tar.gz spark-d28c67544b26c38d51a31d1f8dac3fc23860e1ef.tar.bz2 spark-d28c67544b26c38d51a31d1f8dac3fc23860e1ef.zip | |
[SPARK-14986][SQL] Return correct result for empty LATERAL VIEW OUTER
## What changes were proposed in this pull request?
A Generate with the `outer` flag enabled should always return one or more rows for every input row. The optimizer currently violates this by rewriting `outer` Generates that do not contain columns of the child plan into an unjoined generate, for example:
```sql
select e from a lateral view outer explode(a.b) as e
```
The result of this is that `outer` Generate does not produce output at all when the Generators' input expression is empty. This PR fixes this.
## How was this patch tested?
Added test case to `SQLQuerySuite`.
Author: Herman van Hovell <hvanhovell@questtec.nl>
Closes #12906 from hvanhovell/SPARK-14986.
Diffstat (limited to '.travis.yml')
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