redshift glue job bigint issue

I have a redshi9ft database. in the database i have created a table and in the table i have a bigint column. i created a glue job to insert data in to redshift. but problem is with bigint field. it is not inserting. seems some issue with bigint. job code is below. I am using python 3 and spark 2.2,

import sys
from awsglue.transforms import *
from awsglue.utils import getResolvedOptions
from pyspark.context import SparkContext
from awsglue.context import GlueContext
from awsglue.job import Job

args = getResolvedOptions(sys.argv, ['TempDir','JOB_NAME'])

sc = SparkContext()
glueContext = GlueContext(sc)
 spark = glueContext.spark_session
job = Job(glueContext)
job.init(args['JOB_NAME'], args)

datasource0 = glueContext.create_dynamic_frame.from_catalog(database = "test", table_name = 
"tbl_test", transformation_ctx = "datasource0")

applymapping1 = ApplyMapping.apply(frame = datasource0, mappings = [("testdata", "string", 
 "testdata", "string"), ("selling", "bigint", "selling", "bigint")], transformation_ctx = "applymapping1")

resolvechoice2 = ResolveChoice.apply(frame = applymapping1, choice = "make_cols", 
 transformation_ctx = "resolvechoice2")

dropnullfields3 = DropNullFields.apply(frame = resolvechoice2, transformation_ctx = 
"dropnullfields3")

 datasink4 = glueContext.write_dynamic_frame.from_jdbc_conf(frame = dropnullfields3, 
 catalog_connection = "redshift_con", connection_options = {"dbtable": "tbl_test", 
 "database": "test"}, redshift_tmp_dir = args["TempDir"], transformation_ctx = "datasink4")
 job.commit()