Spark SQL date conversion error from timestamp to string when using presto - apache-spark-sql

Question

I am trying to pull data from a table where the dates are in timestamp format 2019-06-31 19:00:00
I want to have them in string format as 20190631
It works if I choose get_pandas_df instead of get_spark_df but I need it in get_spark_df
I have tried this so far:
start_date = '2019-06-15'
end_date = '2019-06-31'
records = QaasHook.get_spark_df("""
(SELECT name,
cast(date_format(startdt, '%Y%m%d') AS VARCHAR) AS stdt,
cast(amnt AS DOUBLE) AS amount,
cast(date_format(enddt, '%Y%m%d') AS VARCHAR) AS endt
FROM table_1
WHERE cast(date_format(startdt, '%Y%m%d') AS INT) >= {st_dt}
AND cast(date_format(enddt, '%Y%m%d') AS INT) <= {end_dt} )
""".format(st_dt = start_date.replace('-',''), end_dt = end_date.replace('-',''))
)
But I get an error on the format line as
Py4JJavaError Traceback (most recent call last)
<ipython-input-36-c72fafc06f37> in <module>
159 where cast(date_format(cph.d_chkdate,'%Y%m%d') as int) >= {st_dt} and cast(date_format(cph.d_chkdate,'%Y%m%d') as int) <= {end_dt})
--> 160 """.format(st_dt = start_date.replace('-',''), end_dt = end_date.replace('-',''))
161 )
162
/opt/pyenv/versions/3.7.4/lib/python3.7/site-packages/dss_airflow_utils/hooks/qaas_hook.py in get_spark_df(self, dbtable, options)
258 ", ".join(actual_options.keys()))
259 spark_op = spark_op.options(**actual_options)
--> 260 return spark_op.load()
261
262 def get_conn(self):
/opt/spark-3.0.0/python/pyspark/sql/readwriter.py in load(self, path, format, schema, **options)
182 return self._df(self._jreader.load(self._spark._sc._jvm.PythonUtils.toSeq(path)))
183 else:
--> 184 return self._df(self._jreader.load())
185
186 #since(1.4)
/opt/spark-3.0.0/python/lib/py4j-0.10.9-src.zip/py4j/java_gateway.py in __call__(self, *args)
1303 answer = self.gateway_client.send_command(command)
1304 return_value = get_return_value(
-> 1305 answer, self.gateway_client, self.target_id, self.name)
1306
1307 for temp_arg in temp_args:
/opt/spark-3.0.0/python/pyspark/sql/utils.py in deco(*a, **kw)
129 def deco(*a, **kw):
130 try:
--> 131 return f(*a, **kw)
132 except py4j.protocol.Py4JJavaError as e:
133 converted = convert_exception(e.java_exception)
/opt/spark-3.0.0/python/lib/py4j-0.10.9-src.zip/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
326 raise Py4JJavaError(
327 "An error occurred while calling {0}{1}{2}.\n".
--> 328 format(target_id, ".", name), value)
329 else:
330 raise Py4JError(
Py4JJavaError: An error occurred while calling o527.load.
: java.sql.SQLException: Error executing query
at io.prestosql.jdbc.PrestoStatement.internalExecute(PrestoStatement.java:274)
at io.prestosql.jdbc.PrestoStatement.execute(PrestoStatement.java:227)
at io.prestosql.jdbc.PrestoPreparedStatement.<init>(PrestoPreparedStatement.java:80)
at io.prestosql.jdbc.PrestoConnection.prepareStatement(PrestoConnection.java:128)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRDD$.resolveTable(JDBCRDD.scala:58)
at org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation$.getSchema(JDBCRelation.scala:226)
at org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:35)
at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:339)
at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:279)
at org.apache.spark.sql.DataFrameReader.$anonfun$load$2(DataFrameReader.scala:268)
at scala.Option.getOrElse(Option.scala:189)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:268)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:203)
at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:748)
Any help would be appreciated