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https://issues.apache.org/jira/browse/FLINK-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034838#comment-15034838
]
ASF GitHub Bot commented on FLINK-3097:
---------------------------------------
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
----
> Add support for custom functions in Table API
> ---------------------------------------------
>
> Key: FLINK-3097
> URL: https://issues.apache.org/jira/browse/FLINK-3097
> Project: Flink
> Issue Type: New Feature
> Components: Table API
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Currently, the Table API has a very limited set of built-in functions.
> Support for custom functions can solve this problem. Adding of a custom row
> function could look like:
> {code}
> TableEnvironment tableEnv = new TableEnvironment();
> RowFunction<String> rf = new RowFunction<String>() {
> @Override
> public String call(Object[] args) {
> return ((String) args[0]).trim();
> }
> };
> tableEnv.getConfig().registerRowFunction("TRIM", rf,
> BasicTypeInfo.STRING_TYPE_INFO);
> DataSource<Tuple1<String>> input = env.fromElements(
> new Tuple1<>(" 1 "));
> Table table = tableEnv.fromDataSet(input);
> Table result = table.select("TRIM(f0)");
> {code}
> This feature is also necessary as part of FLINK-2099.
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