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Posted to issues@flink.apache.org by "Timo Walther (JIRA)" <ji...@apache.org> on 2015/12/01 23:32:11 UTC
[jira] [Created] (FLINK-3097) Add support for custom functions in
Table API
Timo Walther created FLINK-3097:
-----------------------------------
Summary: 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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