code: def serialize(self):
      schema_serialization = self._schema_manager.serialize()
      fields = schema_serialization["fields"]
      for col_id, field in enumerate(fields):
          block_id = self._block_manager.loc_block(
              col_id, with_offset=False
          )
          should_compress = self._block_manager.blocks[
              block_id
          ].should_compress
          field["should_compress"] = should_compress
  
      schema_serialization["fields"] = fields
      return schema_serialization
  
imports: import numpy
  from .schema_manager import SchemaManager
  from .block_manager import BlockManager
  from .block_manager import BlockType
  import pandas
  from ..entity import types
  from typing import Union, List, Tuple
  from ..conf.default_config import DATAFRAME_BLOCK_ROW_SIZE
label_desc: Use image node_id 30 for calling the DataManager obj's underlying member method code with example usage: obj.serialize() and returns: schema_serialization