Hibernate dialect for Hive/SparkSQL?

Question

I have an app that used to connect to MySQL, and I have Hibernate config for it like this:

<hibernate-configuration>
   <session-factory>
       <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
       <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
       <property name="hibernate.connection.url">jdbc:mysql://somehost:3306/some_db</property>
       ...

Now if I want to connect to Hive/SparkSQL instead, what would the equivalent values for these properties be?

I have some ideas on driver_class and url (assuming we are using port 10000), but what should the dialect be?

<property name="hibernate.connection.driver_class">org.apache.hive.jdbc.HiveDriver</property>
<property name="hibernate.connection.url">jdbc:hive2://someHost:10000</property>

Update

I tried many different values but none of them work. (I have yet to find out what metastore the Apache Hive installation uses, so here I was just doing trial-and-error)

org.hibernate.dialect.MySQLDialect
org.hibernate.dialect.MySQLInnoDBDialect
org.hibernate.dialect.DerbyDialect
org.hibernate.dialect.DerbyTenFiveDialect
org.hibernate.dialect.Oracle10gDialect
org.hibernate.dialect.H2Dialect
org.hibernate.dialect.Dialect

I noticed that in all case, there is a warning from Hibernate that said:

WARN JdbcServicesImpl,main:160 - \
  HHH000341: Could not obtain connection metadata : \
  Method not supported

And then the code would run into a NullPointerException
in org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure() (Line 207 in 4.2.0.Final).

I downloaded the source code of Hibernate and traced the logic. The exception was caused because a few line ahead a variable dialect (of type Dialect) was determined to be null due to an exception caught when trying to execute Line 138:

metaReportsDDLCausesTxnCommit = meta.dataDefinitionCausesTransactionCommit();

The exception was

java.sql.SQLException: Method not supported

(that caused the above warning message)

Does that mean I cannot use Hibernate with Apache Hive? If that is the case, then so be it. (I guess I would have to swap out the Hibernate implementation for this part) But I am curious to know the authoritative answer on this.

On the Internet I could not find strong evidence that people have been using Hibernate successfully with Apache Hive.

Answer 1

I am answering my own question here.

I think the answer is "No -- there is no dialect for Hive/SparkSQL" for Hibernate. Apparently there are no support for HiveServer2 (i.e. not the Hive Metastore) in Hibernate. I believe this is true (95% confidence) as of now (2017-10-19).

In my case, I ended up rewriting my code and replacing the Hibernate code to direct JDBC code instead. I was lucky that the Hibernate code there was just for simple DB query (session.createSQLQuery()) not serious ORM, so the change was relatively easy.