[jira] [Created] (FLINK-3097) Add support for custom functions in Table API

[Timo Walther (JIRA)]

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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