proxy.startTableScan();
byte[] nextRow = proxy.getNextRow();
row = Row.deserialize(nextRow);
proxy.endScan();
row.getRecords().put(TestConstants.COLUMN2, ITUtils.encodeValue(2)); // update t1 set c2=2 where c1 is null
proxy.updateRow(nextRow, row.serialize());
Map<String, ByteBuffer> searchMap = Maps.newHashMap();
searchMap.put(TestConstants.COLUMN1, null);
QueryKey key = new QueryKey(TestConstants.INDEX1, QueryType.EXACT_KEY, searchMap);
proxy.startIndexScan(key.serialize());