Where is the syntax error on this simple Hive query with STRUCT?

Question

Let\'s import a simple table in Hive:

hive> CREATE EXTERNAL TABLE tweets (id BIGINT, id_str STRING, user STRUCT)
ROW          


        

Answer 1

I finally found the answer. It seems it is a problem with the JAR used to serialize/deserialize the JSON. The default one (Apache) is not able to perform a good job on the data I have.

I tried all these typical JAR (in parenthesis, the class for 'ROW FORMAT SERDE'):

• hive-json-serde-0.2.jar (org.apache.hadoop.hive.contrib.serde2.JsonSerde)
• hive-serdes-1.0-SNAPSHOT.jar (com.cloudera.hive.serde.JSONSerDe)
• hive-serde-1.2.1.jar (org.apache.hadoop.hive.serde2.DelimitedJSONSerDe)
• hive-serde-1.2.1.jar (org.apache.hadoop.hive.serde2.avro.AvroSerDe)

All of them gave me different kinds of errors. I list them there so the next guy can Google them:

• Failed with exception java.io.IOException:org.apache.hadoop.hive.ql.metadata.HiveException: Error evaluating user.id
• java.lang.ClassCastException: org.json.JSONObject cannot be cast to [Ljava.lang.Object;
• Failed with exception java.io.IOException:org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long Failed with exception
• java.io.IOException:org.apache.hadoop.hive.serde2.SerDeException: DelimitedJSONSerDe cannot deserialize.
• Failed with exception java.io.IOException:org.apache.hadoop.hive.serde2.avro.AvroSerdeException: Expecting a AvroGenericRecordWritable

Finally, the working JAR is json-serde-1.3-jar-with-dependencies.jar which can be found here. This one is working with 'STRUCT' and can even ignore some malformed JSON. I have also to use for the creation of the table this class:

 ROW FORMAT SERDE 'org.openx.data.jsonserde.JsonSerDe'
 WITH SERDEPROPERTIES ("ignore.malformed.json" = "true")
 LOCATION ...

If needed, it is possible to recompile it from here or here. I tried the first repository and it is compiling fine for me, after adding the necessary libs. The repository has also been updated recently.