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https://issues.apache.org/jira/browse/FLINK-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051201#comment-15051201
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ASF GitHub Bot commented on FLINK-3097:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1429#issuecomment-163680178
This looks good. :+1: Can you also integrate the support for Scala, i.e.
extract it from #1237
My only concern is that it introduces yet another instance where
TypeInformation is shipped to the cluster. I think we should tackle the problem
at some point. Maybe generate the code on the client and ship the code as a
string. Then use Janino to just compile it to a final class.
> 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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