class_docstr: Rowtime descriptor for describing an event time attribute in the schema.
class_docstr_tok: ["Rowtime","descriptor","for","describing","an","event","time","attribute","in","the","schema","."]
docstr: Sets a built-in timestamp extractor that converts an existing LONG or TIMESTAMP field into
  the rowtime attribute.
  
  :param field_name: The field to convert into a rowtime attribute.
  :return: This rowtime descriptor.
docstr_tok: ["Sets","a","built-in","timestamp","extractor","that","converts","an","existing","LONG","or","TIMESTAMP","field","into","the","rowtime","attribute",".",":","param","field_name",":","The","field","to","convert","into","a","rowtime","attribute",".",":","return",":","This","rowtime","descriptor","."]
code: def timestamps_from_field(self, field_name: str):
      """
      Sets a built-in timestamp extractor that converts an existing LONG or TIMESTAMP field into
      the rowtime attribute.
  
      :param field_name: The field to convert into a rowtime attribute.
      :return: This rowtime descriptor.
      """
      self._j_rowtime = self._j_rowtime.timestampsFromField(field_name)
      return self
  
imports: import sys
  from abc import ABCMeta
  from collections import OrderedDict
  from py4j.java_gateway import get_method
  from typing import Dict, Union
  from pyflink.java_gateway import get_gateway
  from pyflink.table.table_schema import TableSchema
  from pyflink.table.types import DataType, _to_java_data_type
label_desc: Use image node_id 2 for calling the Rowtime obj's underlying member method code with example usage: obj.timestamps_from_field(field_name) and returns: self