Examples of org.apache.pig.builtin.BagToString

org.apache.pig.builtin.BagToString
Flatten a bag into a string. This UDF will use the character '_' as the default delimiter if one is not provided. Example: bag={(a),(b),(c)} BagToString(bag) -> 'a_b_c' BagToString(bag, '+') -> 'a+b+c' bag={(a,b), (c,d), (e,f)} BagToString(bag) --> 'a_b_c_d_e_f' If input bag is null, this UTF will return null;

  }




  @Test
  public void testNullInputBagToStringUDF() throws Exception {
    BagToString udf = new BagToString();
    Tuple udfInput = tf.newTuple(1);
    udfInput.set(0, null);
    String output = udf.exec(udfInput);
    assertNull(output);
  }

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  public void testInvalidInputForBagToStringUDF() throws Exception {
    TupleFactory tf = TupleFactory.getInstance();
    Tuple udfInput = tf.newTuple(1);
    // input contains tuple instead of bag
    udfInput.set(0, tf.newTuple());
    BagToString udf = new BagToString();


    // expecting an exception because the input if of type Tuple, not DataBag
    udf.exec(udfInput);
  }

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    DataBag bag = bf.newDefaultBag();
    bag.add(t1);
    bag.add(t2);


    BagToString udf = new BagToString();
    Tuple udfInput = tf.newTuple(1);
    udfInput.set(0, bag);
    String result = udf.exec(udfInput);


    assertEquals("a_5_c_6", result);
  }

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    DataBag bag = bf.newDefaultBag();
    bag.add(t1);
    bag.add(t2);


    BagToString udf = new BagToString();
    Tuple udfInput = tf.newTuple(2);
    udfInput.set(0, bag);
    udfInput.set(1, "-");
    String result = udf.exec(udfInput);


    assertEquals("a-5-c-6", result);
  }

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    DataBag inputBag = bf.newDefaultBag();
    inputBag.add(t1);
    inputBag.add(t2);


    BagToString udf = new BagToString();
    Tuple udfInput = tf.newTuple(2);
    udfInput.set(0, inputBag);
    udfInput.set(1, "_");
    String result = udf.exec(udfInput);


    assertEquals("a_5_c_6_(d,7)", result);
  }

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  @Test
  public void testNestedDataElementsForBagToStringUDF() throws Exception {


    DataBag inputBag = buildBagWithNestedTupleAndBag();


    BagToString udf = new BagToString();
    Tuple udfInput = tf.newTuple(2);
    udfInput.set(0, inputBag);
    udfInput.set(1, "*");


    String result = udf.exec(udfInput);
    assertEquals("a*5*c*6*(d,7)*{(in bag,10)}", result);
  }

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  public void testInvalidZeroInputToOutputSchemaForBagToTupleStringUDF() throws Exception {




    Schema inputSch = new Schema();


    BagToString udf = new BagToString();
    Schema outputSchema = udf.outputSchema(inputSch);


    assertEquals("schema of BagToTuple input", outputSchema.getField(0).type,
        DataType.CHARARRAY);


  }

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    Schema inputSch = new Schema();
    inputSch.add(bagSch);
    inputSch.add(new FieldSchema(null, DataType.CHARARRAY));


    BagToString udf = new BagToString();
    Schema outputSchema = udf.outputSchema(inputSch);


    assertEquals("schema of BagToTuple input", outputSchema.getField(0).type,
        DataType.CHARARRAY);


  }

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    bagSch.schema = new Schema(tupSch);


    Schema inputSch = new Schema();
    inputSch.add(bagSch);


    BagToString udf = new BagToString();
    Schema outputSchema = udf.outputSchema(inputSch);


    assertEquals("schema of BagToTuple input", outputSchema.getField(0).type,
        DataType.CHARARRAY);


  }

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    Schema inputSch = new Schema();
    inputSch.add(bagSch);
    inputSch.add(new FieldSchema(null, DataType.DOUBLE));


    BagToString udf = new BagToString();
    // expecting an exception because the delimiter is not of type Data.CHARARRAY
    udf.outputSchema(inputSch);
  }

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Related Classes of org.apache.pig.builtin.BagToString

org.apache.pig.data.DataBag

org.apache.pig.impl.logicalLayer.schema.Schema

org.apache.pig.impl.logicalLayer.schema.Schema.FieldSchema

org.apache.pig.test.TestBuiltInBagToTupleOrString

org.apache.pig.backend.executionengine.ExecException

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