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rajesh_ghosh
 Post subject: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Wed Oct 14, 2015 3:14 pm 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Code:
public long count() {

....

String countQuery = "SELECT COUNT(t.id) FROM " + shortClassName + " t ";

TypedQuery<Long> query = __entityManager.createQuery(countQuery, Long.class);

Long count = query.getSingleResult();

return(count);

}


The exception stack is below --

java.lang.IndexOutOfBoundsException: Index: 0
at java.util.Collections$EmptyList.get(Collections.java:4454)
at org.hibernate.ogm.query.impl.OgmQueryLoader.listOfArrays(OgmQueryLoader.java:105)
at org.hibernate.ogm.query.impl.OgmQueryLoader.list(OgmQueryLoader.java:73)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
at org.hibernate.ogm.query.impl.OgmQueryTranslator.list(OgmQueryTranslator.java:127)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1300)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:573)
at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:449)

The entity is as follows :

Code:
@Entity
@Table(name="XXXXX"
)
public class XXXBean implements Serializable {
   
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

....

}


If I replace COUNT by MAX or AVG (with suitable modification of the generic type in the TypedQuery<X>), it works fine !

Is there anything obvious, I am missing here ?
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Thu Oct 15, 2015 7:37 am 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Any clues ?
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DavideD
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Thu Oct 15, 2015 8:50 am 
Hibernate Team
Hibernate Team

Joined: Fri Sep 09, 2011 3:18 am
Posts: 295
Hi,
aggregated functions are currently not supported in OGM when you use JP-QL (http://docs.jboss.org/hibernate/ogm/5.0/reference/en-US/html/ch07.html#using_jp_ql), but I think in this case we should throw a better exception message.

Could you tell us which database you are using and which version of Hibernate OGM?

Davide

EDIT: syntax
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Thu Oct 15, 2015 8:59 am 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Thanks for the reply. I am using MongoDB and my hibernate ogm version is 4.2.0.Final . However I observed that some aggregate functions are working fine e.g. MAX / MIN & AVG .

Regards,
Rajesh
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DavideD
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Thu Oct 15, 2015 10:42 am 
Hibernate Team
Hibernate Team

Joined: Fri Sep 09, 2011 3:18 am
Posts: 295
Quote:
However I observed that some aggregate functions are working fine e.g. MAX / MIN & AVG .

I suspect it won't return the correct results, though. How many elements do you have in the DB?

I've created an issue: https://hibernate.atlassian.net/browse/OGM-926

In the meanwhile, you can follow the suggestion in this post: https://forum.hibernate.org/viewtopic.php?f=31&t=1033703

I hope this help,
Davide
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Fri Oct 16, 2015 6:10 am 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Hi Davide,

Thanks. It really helps. Will still look forward for the fix to come in so that the queries remain platform agnostic.

Regards,
Rajesh
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Thu Oct 22, 2015 3:42 pm 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Tried implementing the count query using native query. Still facing some issues:

1. The documented way of obtaining the count -

Code:
Query query = __entityManager.createNativeQuery(queryStr);
Object[] count = (Object[]) query.getSingleResult();


is throwing ClassCastException . If I simply change it to

Code:
Query query = __entityManager.createNativeQuery(queryStr);
Long count = (Long) query.getSingleResult();


then it is working as expected. Is there a change in 4.2.0.Final w.r.t the mongo query result set behavior ?

2. The parser is unable to parse logical "OR" operation. The query string below , works from command line but not in the code snippet

Code:
String queryStr = "db.collection_name.count( { $or: [ { 'attribute_name' : '1001' }, { 'attribute_name' : '1019' } ] } )";
Query query = __entityManager.createNativeQuery(queryStr);


The stack is as follows:

Code:
com.mongodb.util.JSONParseException:
db.collection_name.count( { $or: [ { 'attribute_name' : '1001' }, { 'attribute_name' : '1019' } ] } )
^
   at com.mongodb.util.JSONParser.parse(JSON.java:208)
   at com.mongodb.util.JSONParser.parse(JSON.java:155)
   at com.mongodb.util.JSON.parse(JSON.java:93)
   at com.mongodb.util.JSON.parse(JSON.java:74)
   at org.hibernate.ogm.datastore.mongodb.query.parsing.nativequery.impl.MongoDBQueryDescriptorBuilder.build(MongoDBQueryDescriptorBuilder.java:48)
   at org.hibernate.ogm.datastore.mongodb.MongoDBDialect.parseNativeQuery(MongoDBDialect.java:725)
   at org.hibernate.ogm.datastore.mongodb.MongoDBDialect.parseNativeQuery(MongoDBDialect.java:128)
   at org.hibernate.ogm.dialect.impl.ForwardingGridDialect.parseNativeQuery(ForwardingGridDialect.java:191)
   at org.hibernate.ogm.query.impl.NativeNoSqlQueryInterpreter.getCustomQuery(NativeNoSqlQueryInterpreter.java:50)
   at org.hibernate.ogm.query.impl.NativeNoSqlQueryInterpreter.createQueryPlan(NativeNoSqlQueryInterpreter.java:45)
   at org.hibernate.engine.query.spi.QueryPlanCache.getNativeSQLQueryPlan(QueryPlanCache.java:226)
   at org.hibernate.ogm.hibernatecore.impl.OgmSessionImpl.list(OgmSessionImpl.java:307)
   at org.hibernate.ogm.query.impl.NoSQLQueryImpl.list(NoSQLQueryImpl.java:130)
   at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:573)
   at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:495)


Can you please confirm whether this is supported or not ?
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Sat Oct 24, 2015 11:38 am 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Any update on my last post ?

Thanks.
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DavideD
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Mon Oct 26, 2015 7:00 am 
Hibernate Team
Hibernate Team

Joined: Fri Sep 09, 2011 3:18 am
Posts: 295
Sorry, somehow I missed your last question.

Logical operator are not supported at the moment.

I'll create an issue for that
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DavideD
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Mon Oct 26, 2015 7:06 am 
Hibernate Team
Hibernate Team

Joined: Fri Sep 09, 2011 3:18 am
Posts: 295
The link to the JIRA
https://hibernate.atlassian.net/browse/OGM-927

Would you like to create a patch for this? That would be very appreciated.
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Wed Oct 28, 2015 4:38 am 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Hello Davide,

Thanks for the update. Although I would love to contribute in the community, I need to obtain lot of legal clearance from my employer before I can participate. I am not sure whether it will work out but I'll definitely try.

Did you get a chance to look into my other question on the return type for native count query ?

Thanks,
Rajesh
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DavideD
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Wed Oct 28, 2015 11:53 am 
Hibernate Team
Hibernate Team

Joined: Fri Sep 09, 2011 3:18 am
Posts: 295
Hi rajesh_ghosh,

Actually, it turns out that you can already write that query, but you have to surround the operator with single or double quotes

The query will work:

Code:
db.collection_name.count( { '$or': [ { 'attribute_name' : '1001' }, { 'attribute_name' : '1019' } ] } )


I hope this workaround will work.

Cheers,
Davide
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rajesh_ghosh
 Post subject: Re: Simple COUNT Query throwing IndexOutOfBoundsException
PostPosted: Thu Oct 29, 2015 8:21 am 
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Joined: Mon Jul 27, 2015 4:03 am
Posts: 29
Hello Davide,

Yes it worked ! Thanks a bunch. I should tried that out myself.

Regards,
Rajesh
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