GitHub user twalthr opened a pull request:
https://github.com/apache/flink/pull/2265
[FLINK-3097] [table] Add support for custom functions in Table API
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This PR introduces user-defined scalar functions for the Table and SQL API.
I will add documentation soon, but this is the general syntax so far:
In Java:
```java
public class HashCode extends ScalarFunction {
public int eval(String s) {
return s.hashCode();
}
}
tableEnv.registerFunction("hashCode", new HashCode());
Table result = table.select("text.hashCode()");
Table result = tableEnv.sql("SELECT hashCode(text) FROM MyTable")
```
In Scala:
```scala
object hashCode extends ScalarFunction {
def eval(s: String): Int = {
s.hashCode()
}
}
val result = table.select(hashCode(text));
val result = tableEnv.sql("SELECT hashCode(text) FROM MyTable")
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/twalthr/flink FLINK-3097
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2265.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 #2265
----
commit 3b792569bccea843646d8c88592e9c20ecf0ed37
Author: twalthr <twal...@apache.org>
Date: 2016-07-12T10:22:41Z
[FLINK-3097] [table] Add support for custom functions in Table API
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