MapVector v = new MapVector("", allocator);
ComplexWriterImpl writer = new ComplexWriterImpl("col", v);
writer.allocate();
DrillBuf buffer = allocator.buffer(255);
JsonReaderWithState jsonReader = new JsonReaderWithState(new ReaderJSONRecordSplitter(compound), buffer,
GroupScan.ALL_COLUMNS, false);
int i =0;
List<Integer> batchSizes = Lists.newArrayList();
outside: while(true){