### Question:
ColumnCountGetFilter extends FilterBase { public ColumnCountGetFilter() { super(); } ColumnCountGetFilter();  ColumnCountGetFilter(final int n); int getLimit(); @Override boolean filterAllRemaining(); @Override ReturnCode filterKeyValue(KeyValue v); @Override void reset(); static Filter createFilterFromArguments(ArrayList<byte []> filterArguments); @Override void readFields(DataInput in); @Override void write(DataOutput out); @Override String toString();  }### Answer:
@Test public void testColumnCountGetFilter() throws IOException { String family = "Family"; HTableDescriptor htd = new HTableDescriptor("testColumnCountGetFilter"); htd.addFamily(new HColumnDescriptor(family)); HRegionInfo info = new HRegionInfo(htd.getName(), null, null, false); HRegion region = HRegion.createHRegion(info, TEST_UTIL. getDataTestDir(), TEST_UTIL.getConfiguration(), htd); try { String valueString = "ValueString"; String row = "row-1"; List<String> columns = generateRandomWords(10000, "column"); Put p = new Put(Bytes.toBytes(row)); p.setWriteToWAL(false); for (String column : columns) { KeyValue kv = KeyValueTestUtil.create(row, family, column, 0, valueString); p.add(kv); } region.put(p); Get get = new Get(row.getBytes()); Filter filter = new ColumnCountGetFilter(100); get.setFilter(filter); Scan scan = new Scan(get); InternalScanner scanner = region.getScanner(scan); List<KeyValue> results = new ArrayList<KeyValue>(); scanner.next(results); assertEquals(100, results.size()); } finally { region.close(); region.getLog().closeAndDelete(); } region.close(); region.getLog().closeAndDelete(); }