Examples with Transformer org.apache.hudi.utilities.transform.Transformer used on opensource projects

Example 1 with Transformer

use of org.apache.hudi.utilities.transform.Transformer in project hudi by apache.

the class TestChainedTransformer method testChainedTransformation.

@Test
public void testChainedTransformation() {
    StructType schema = DataTypes.createStructType(new StructField[] { createStructField("foo", StringType, false) });
    Row r1 = RowFactory.create("100");
    Row r2 = RowFactory.create("200");
    Dataset<Row> original = spark().sqlContext().createDataFrame(Arrays.asList(r1, r2), schema);
    Transformer t1 = (jsc, sparkSession, dataset, properties) -> dataset.withColumnRenamed("foo", "bar");
    Transformer t2 = (jsc, sparkSession, dataset, properties) -> dataset.withColumn("bar", dataset.col("bar").cast(IntegerType));
    ChainedTransformer transformer = new ChainedTransformer(Arrays.asList(t1, t2));
    Dataset<Row> transformed = transformer.apply(jsc(), spark(), original, null);
    assertEquals(2, transformed.count());
    assertArrayEquals(new String[] { "bar" }, transformed.columns());
    List<Row> rows = transformed.collectAsList();
    assertEquals(100, rows.get(0).getInt(0));
    assertEquals(200, rows.get(1).getInt(0));
}