Getting NULL after create external table in Hive using parquet file as storage

I hope this helps . I'm trying to dynamically (without listing column names and types in Hive DDL) create a Hive external table on parquet data files. I have the Avro schema of underlying parquet file. , Below query works:

CREATE TABLE avro_test ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.avro.AvroSerDe' STORED AS AVRO TBLPROPERTIES ('avro.schema.url'='myHost/myAvroSchema.avsc'); 

CREATE EXTERNAL TABLE parquet_test LIKE avro_test STORED AS PARQUET LOCATION 'hdfs://myParquetFilesPath';

wish of those help After you create the partitioned table, run the following in order to add the directories as partitions

MSCK REPAIR TABLE table_name;

wish help you to fix your issue you can do it with the next steps:
1.Create a temporary table and store the file like it is (with map column type);

wish help you to fix your issue As you are writing parquet file to /hadoop/db1/managed_table55/test.parquet this location Try creating table in the same location and read the data from hive table.
Create Hive Table:

hive> CREATE external table  if not EXISTS db1.managed_table55 (dummy string)
stored as parquet
location '/hadoop/db1/managed_table55/test.parquet';

df=spark.read.csv("/user/use_this.csv", header='true')
df.write.save('/hadoop/db1/managed_table55/test.parquet', format="parquet")