@Test
public void testFrequentItems() {
DataFrame df = context.table("testData2");
String[] cols = {"a"};
DataFrame results = df.stat().freqItems(cols, 0.2);
Assert.assertTrue(results.collect()[0].getSeq(0).contains(1));
}
@Test
public void testCreateDataFromFromList() {
StructType schema = createStructType(Arrays.asList(createStructField("i", IntegerType, true)));
List<Row> rows = Arrays.asList(RowFactory.create(0));
DataFrame df = context.createDataFrame(rows, schema);
Row[] result = df.collect();
Assert.assertEquals(1, result.length);
}
@Test
public void testCrosstab() {
DataFrame df = context.table("testData2");
DataFrame crosstab = df.stat().crosstab("a", "b");
String[] columnNames = crosstab.schema().fieldNames();
Assert.assertEquals("a_b", columnNames[0]);
Assert.assertEquals("2", columnNames[1]);
Assert.assertEquals("1", columnNames[2]);
Row[] rows = crosstab.collect();
Arrays.sort(rows, crosstabRowComparator);
Integer count = 1;
for (Row row : rows) {
Assert.assertEquals(row.get(0).toString(), count.toString());
Assert.assertEquals(1L, row.getLong(1));
Assert.assertEquals(1L, row.getLong(2));
count++;
}
}