Merge operation in ADLS table

  path = get_abfss_path(linked_service, container_name, path) # get delta table path using linked service

            df_count = df.count()

            df = df.dropDuplicates() #remove duplicates in dataframe

            if DeltaTable.isDeltaTable(self.spark, path): # check table exists already in delta lake

                delta_table = DeltaTable.forPath(self.spark, path)

                delta_table.alias("t").merge(

                    df.alias("u"),

                    "u.body.seqn = t.body.seqn") \

                .whenMatchedUpdateAll() \

                .whenNotMatchedInsertAll() \

                .execute()