class_docstr: CsvSchema holds schema information of a csv file, corresponding to Java
  ``com.fasterxml.jackson.dataformat.csv.CsvSchema`` class.
  
  .. versionadded:: 1.16.0
code: def size(self):
      return self._j_schema.size()
  
imports: from typing import Optional, TYPE_CHECKING
  from pyflink.common.serialization import BulkWriterFactory, RowDataBulkWriterFactory, SerializationSchema, DeserializationSchema
  from pyflink.common.typeinfo import TypeInformation
  from pyflink.datastream.connectors.file_system import StreamFormat
  from pyflink.java_gateway import get_gateway
label_desc: Use image node_id 3 for calling the CsvSchema obj's underlying member method code with example usage: obj.size() and returns: self