TypeError：TimestampType无法接受对象 <class 'str'> 和 <class 'int'>

Question

I have a pandas dataframe that I am writing to a table in HDFS. I can write the data to a table when the Srum_Entry_Creation is StringType() , but I need it to be TimestampType() . This is where I am running into TypeError: TimestampType can not accept object '2019-05-20 12:03:00' in type <class 'str'> or TypeError: TimestampType can not accept object 1558353780000000000 in type <class 'int'> . I have tried converting the column to different date formats in python, before defining the schema but can seem to get the import to work.

df
    Srum_Entry_ID   Connected_Time  Machine     Srum_Entry_Creation
0   5769.0          0.018218        Computer1   2019-05-20 12:03:00
1   5770.0          0.000359        Computer1   2019-05-20 12:03:00
2   5771.0          0.042674        Computer2   2019-05-20 13:03:00
3   5772.0          0.043229        Computer2   2019-05-20 14:04:00
4   5773.0          0.032222        Computer3   2019-05-20 14:04:00

spark = SparkSession.builder.appName('application').getOrCreate()
schema = StructType([StructField('Srum_Entry_ID', FloatType(), False),
                     StructField('Connected_Time', FloatType(), True),
                     StructField('Machine', StringType(), True),
                     StructField('Srum_Entry_Creation', TimestampType(), True)])
dataframe = spark.createDataFrame(df, schema)
dataframe.write. \
  mode("append"). \
  option("path", "/user/hive/warehouse/analytics.db/srum_network_connections"). \
  saveAsTable("analytics.srum_network_connections")

I have tried:

df['Srum_Entry_Creation'] = df['Srum_Entry_Creation'].astype('datetime64[ns]')

error: TypeError: TimestampType can not accept object 1558353780000000000 in type <class 'int'>

and

df['Srum_Entry_Creation'] = pd.to_datetime(df['Srum_Entry_Creation'])

error: TypeError: TimestampType can not accept object 1558353780000000000 in type <class 'int'>

and if I just leave it as a string in the pandas dataframe I get:

error: TypeError: TimestampType can not accept object '2019-05-20 12:03:00' in type <class 'str'>

Answer 1

In short I converted the datetime to epoch time

df['epoch'] = (df['New_Srum_Entry_Creation'] - dt.datetime(1970,1,1)).dt.total_seconds()
df['epoch'] = df['epoch'].astype('Int64')

Then used IntegerType() for the schema

StructField('epoch', IntegerType(),True)