GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/16821
[SPARK-19472][SQL] Parser should mistake CASE WHEN(...) for a function call
## What changes were proposed in this pull request?
The SQL parser can mistake a `WHEN (...)` used in `CASE` for a function
call. This happens in cases like the following:
```sql
select case when (1) + case when 1 > 0 then 1 else 0 end = 2 then 1 else 0
end
from tb
```
This PR fixes this by re-organizing the case related parsing rules.
## How was this patch tested?
Added a regression test to the `ExpressionParserSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-19472
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16821.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 #16821
----
commit 870f29820b704c4ee73bb07e12db187a923a15e2
Author: Herman van Hovell <[email protected]>
Date: 2017-02-06T15:03:23Z
Do not mistake CASE WHEN(...) for a function call.
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