Package org.apache.beam.sdk.extensions.sql

Interface BeamSqlUdf

  • All Superinterfaces:
    java.io.Serializable
    @Experimental
public interface BeamSqlUdf
extends java.io.Serializable
    Interface to create a UDF in Beam SQL.

    A static method eval is required. Here is an example: 

     public static class MyLeftFunction {
   public String eval(
       @Parameter(name = "s") String s,
       @Parameter(name = "n", optional = true) Integer n) {
     return s.substring(0, n == null ? 1 : n);
   }
 }

    The first parameter is named "s" and is mandatory, and the second parameter is named "n" and is optional(always NULL if not specified).

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String UDF_METHOD