code: def execute(cls, ctx, op):
      if vineyard is None:
          raise RuntimeError("vineyard is not available")
  
      socket = resolve_vineyard_socket(ctx, op)
      client = vineyard.connect(socket)
  
      meta = client.get_meta(vineyard.ObjectID(op.object_id))
      chunks, dtypes = [], None
      for idx in range(meta["partitions_-size"]):
          chunk_meta = meta["partitions_-%d" % idx]
          columns = pd.Index(
              vy_data_utils.from_json(chunk_meta["columns_"])
          )
          shape = (np.nan, len(columns))
          if not chunk_meta.islocal:
              continue
          if dtypes is None:
              dtypes = []
              for idx in range(len(columns)):
                  column_meta = chunk_meta["__values_-value-%d" % idx]
                  dtype = vy_data_utils.normalize_dtype(
                      column_meta["value_type_"],
                      column_meta.get("value_type_meta_", None),
                  )
                  dtypes.append(dtype)
              dtypes = pd.Series(dtypes, index=columns)
          chunk_index = (
              chunk_meta.get("partition_index_row_", -1),
              chunk_meta.get("partition_index_column_", -1),
          )
          # chunk: (chunk_id, worker_address, dtype, shape, index, columns)
          chunks.append(
              (
                  repr(chunk_meta.id),
                  ctx.worker_address,
                  dtypes,
                  shape,
                  chunk_index,
                  columns,
              )
          )
  
      ctx[op.outputs[0].key] = pd.DataFrame(
          chunks, columns=cls.generated_columns
      )
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...core.context import get_context
  from ...serialization.serializables import Int32Field, StringField
  from ...tensor.datasource.from_vineyard import resolve_vineyard_socket
  from ...utils import calc_nsplits, has_unknown_shape, lazy_import
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import parse_index
label_desc: Use image node_id 7 for calling the DataFrameFromVineyard obj's underlying member method code with example usage: obj.execute(cls, ctx, op) without return types