sdks/python/apache_beam/yaml/tests/java-map.yaml

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pipelines:
  - pipeline:
      type: chain
      transforms:
        - type: Create
          config:
            elements:
              - {a: "x", b: 1, c: 1.0}
              - {a: "y", b: 2, c: 0.5}
              - {a: "z", b: 3, c: 0.25}
              - {a: "z", b: 10, c: -1.5}

        - type: Filter
          config:
            language: java
            keep:
              expression: c > 0

        - type: MapToFields
          config:
            language: java
            append: true
            drop: a
            fields:
              seq:
                callable: |
                  import java.util.function.Function;
                  import org.apache.beam.sdk.values.Row;
                  import java.util.List;
                  import java.util.ArrayList;

                  public class Seq implements Function<Row, List<String>> {
                    public List<String> apply(Row row) {
                      String base = row.getString("a");
                      List<String> result = new ArrayList<>();
                      String s = "";
                      for (int i = 0; i < row.getInt64("b"); i++) {
                        s += base;
                        result.add(s);
                      }
                      return result;
                    }
                  }

        - type: Explode
          config:
            fields: [seq]

        - type: AssertEqual
          config:
            elements:
              - {b: 1, c: 1.0, seq: x}
              - {b: 2, c: 0.5, seq: y}
              - {b: 2, c: 0.5, seq: yy}
              - {b: 3, c: .25, seq: z}
              - {b: 3, c: .25, seq: zz}
              - {b: 3, c: .25, seq: zzz}