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https://issues.apache.org/jira/browse/DERBY-5501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154567#comment-13154567
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Dag H. Wanvik commented on DERBY-5501:
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Thanks, I'll mail you the URL.
> Subquery is only allowed to return a single column - When using derby with
> hibernate (or JPA) queries are created per JPA spec. For tables with
> multi-column PK, subqueries are created with two columns in select clause.
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-5501
> URL: https://issues.apache.org/jira/browse/DERBY-5501
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1,
> 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0,
> 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2, 10.8.2.2
> Environment: Max/Linux
> Reporter: Sandeep Dixit
> Assignee: Dag H. Wanvik
> Fix For: 10.9.0.0
>
> Attachments: derby-5501-1.diff, derby-5501-1.stat, derby-5501-2.diff,
> derby-5501-2.diff, derby-5501-3.diff, derby-5501-3.stat, derby-5501-repro.diff
>
>
> ERROR: Subquery is only allowed to return a single column.
> PROBLEM: When using derby with hibernate (or JPA) queries are created by the
> JPA engine per JPA spec. For tables with multi-column PK, subqueries are
> created with two columns in select clause (see select
> colofassig6_.activityID, colofassig6_.assigneeID from Assignment in the
> query below).
> Without this support, I can not use Derby with JPA.
> Hibernate: select distinct activitybe0_.activityID as activityID69_,
> activitybe0_.createdBy as createdBy69_, activitybe0_.createdOn as
> createdOn69_, activitybe0_.lastModifiedBy as lastModi4_69_,
> activitybe0_.lastModifiedOn as lastModi5_69_, activitybe0_.activityDate as
> activity6_69_, activitybe0_.activityTypeHierarchyID as activity7_69_,
> activitybe0_.activityTypeID as activity8_69_, activitybe0_.campaignID as
> campaignID69_, activitybe0_.comments as comments69_, activitybe0_.description
> as descrip11_69_, activitybe0_.inputID as inputID69_,
> activitybe0_.inputTypeID as inputTy13_69_, activitybe0_.name as name69_,
> activitybe0_.notes as notes69_, activitybe0_.organizationID as organiz16_69_,
> activitybe0_.parentActivityTypeID as parentA17_69_ from Activity
> activitybe0_, Activity activitybe1_ inner join ActivitySchedule colofactiv2_
> on activitybe1_.activityID=colofactiv2_.activityID inner join
> ActivityScheduleStatus colofactiv3_ on
> colofactiv2_.activityScheduleID=colofactiv3_.activityScheduleID inner join
> ActivityScheduleStatusType activitysc4_ on
> colofactiv3_.activityScheduleStatusTypeID=activitysc4_.activityScheduleStatusTypeID,
> ActivityTypeHierarchy activityty5_ where
> activitybe0_.activityTypeHierarchyID=activityty5_.activityTypeHierarchyID and
> activityty5_.activityTypeHierarchyID=? and not (exists (select
> colofassig6_.activityID, colofassig6_.assigneeID from Assignment colofassig6_
> where activitybe0_.activityID=colofassig6_.activityID)) and
> (activitybe0_.activityID<>activitybe1_.activityID or
> activitysc4_.name<>'Route')
> 2011-11-14 11:41:13,413 ERROR [org.hibernate.util.JDBCExceptionReporter]
> (EJB-Timer-1321288405420[target=jboss.j2ee:ear=oecrm1.6.3RC1-derby-jboss.ear,jar=builder-ejb.jar,name=WorkflowActivatorBean,service=EJB3])
> Subquery is only allowed to return a single column.
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