Dynamically create Hive external table with Avro schema on Parquet Data

问题

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.

My try is to use below DDL:

CREATE EXTERNAL TABLE parquet_test
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.avro.AvroSerDe'
STORED AS PARQUET
LOCATION 'hdfs://myParquetFilesPath'
TBLPROPERTIES ('avro.schema.url'='http://myHost/myAvroSchema.avsc');

My Hive table is successfully created with the right schema, but when I try to read the data :

SELECT * FROM parquet_test;

I get the following error :

java.io.IOException: org.apache.hadoop.hive.serde2.avro.AvroSerdeException: Expecting a AvroGenericRecordWritable

Is there a way to successfully create and read Parquet files, without mentioning columns name and types list in DDL?

回答1:

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';

来源：https://stackoverflow.com/questions/34181844/dynamically-create-hive-external-table-with-avro-schema-on-parquet-data