spark.sql("select cast(count(*) as string) from Database_1.missing_files_config WHERE data_source_name = 'source1' AND source_table_name = 'table1'").show();
java.lang.ClassCastException: cannot assign instance of scala.collection.immutable.List$SerializationProxy to field org.apache.spark.rdd.RDD.org$apache$spark$rdd$RDD$$dependencies_ of type scala.collection.Seq in instance of org.apache.spark.rdd.MapPartitionsRDD