GitHub user twalthr opened a pull request:
https://github.com/apache/flink/pull/1429
[FLINK-3097] [table] Add support for custom functions in Table API
As described in FLINK-3097, this PR implements the possibility of adding
custom row functions for the Table API.
In the tests you can find some examples how custom functions can look like:
```
table.select("TRIM(f0)")
table.select("SYSTEM_TIME()")
table.select("SUBSTRING(SUBSTRING(f0, 2, 5), 0, 1)")
table.select("SUBSTRING(f0, 1), SUBSTRING(f0, 2, 5)")
```
The Scala Table API is not supported yet, since I'm still waiting for #1237.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/twalthr/flink TableApiCustomFunctions
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1429.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 #1429
----
commit f6677487d3fe48042f521226aa4e8358433e1f9c
Author: twalthr <twal...@apache.org>
Date: 2015-11-29T15:15:16Z
[FLINK-3097] [table] Add support for custom functions in Table API
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