Hibernate 6 Changelog
=======================

Note: Please refer to JIRA to learn more about each issue.


Changes in 6.0.0.Alpha7 (March 18, 2021)
------------------------------------------------------------------------------------------------------------------------

https://hibernate.atlassian.net/projects/HHH/versions/31878

** Bug
    * [HHH-14390] - StackOverflowError with @Fetch(FetchMode.SELECT) mapped for entity with an ID that is a bidirectional one-to-one eager association
    * [HHH-14394] - Column "XYZ" must be in the GROUP BY list; SQL Error: 90016
    * [HHH-14466] - StackOverflowError loading an entity with eager one-to-many if bidirectional and many-to-one side is the ID
    * [HHH-14508] - Logging in debug mode gives an invalid conversion error in StandardRowReader.java

** New Feature
    * [HHH-1050] - HQL Unions
    * [HHH-14188] - Enumerated "short name" handling in HQL
    * [HHH-14285] - Create "project template"
    * [HHH-14409] - Internal format of natural-id values

** Task
    * [HHH-14186] - @ColumnTransformer support
    * [HHH-14192] - H2 compatibility: explicitly specify precision/scale for @Column in test
    * [HHH-14195] - Generated DDL for UUID fields contains columns of length 255
    * [HHH-14315] - Upgrade to Gradle 6.7 and use toolchains for per-JDK builds

** Improvement
    * [HHH-10282] - AttributeConverter for Enum within JPQL query
    * [HHH-13077] - Optimize query plan call count
    * [HHH-13658] - Make NO_PROXY unnecessary
    * [HHH-13884] - Follow javax.persistence.criteria.Order.reverse() contract
    * [HHH-14286] - Improvements to Hibernate's Gradle Plugin
    * [HHH-14313] - New natural-id features
    * [HHH-14318] - `@JoinFormula` and `@JoinColumnOrFormula` support
    * [HHH-14452] - Support set operations in JPA Criteria API
    * [HHH-14456] - Allow unwrap of DialectResolutionInfo to support detecting PostgreSQL forks
    * [HHH-14478] - Allow DialectResolvers to be discovered by ServiceLoader

** Sub-task
    * [HHH-13757] - Second-level cache cleanup
    * [HHH-14469] - Support schema-tooling on sub-sets of the relational model known to Hibernate
    * [HHH-14491] - Apply default allocation/increment size for @GeneratedValue(AUTO)
    * [HHH-14492] - Prefer sequence-per-entity (hierarchy) by default

** Remove Feature
    * [HHH-14450] - Drop ability to disable "enhanced proxies"




Changes in 6.0.0.Alpha6 (August 20, 2020)
------------------------------------------------------------------------------------------------------------------------

https://hibernate.atlassian.net/projects/HHH/versions/31848

** Bug
    * [HHH-13828] - Drop EntityPersister extending the internal interface InFlightEntityMappingType

** Improvement
    * [HHH-14172] - Drop any/all usage of Javassist
    * [HHH-14167] - JpaCompliance for @OrderBy handling
    * [HHH-13745] - Verify HqlTranslator usability without SessionFactory

** New Feature
    * [HHH-13132] - HQL inline EntityGraph support
    * [HHH-1523] - Rebuild fetches from query-cache hits

** Task
    * [HHH-14174] - Implent Collection#getElementByIndex
    * [HHH-14173] - @Parent support
    * [HHH-14171] - `@Formula` support
    * [HHH-14170] - Implement RowId support
    * [HHH-14169] - Implement SQM `member of` predicate
    * [HHH-14168] - Support for custom Type/UserType impls
    * [HHH-14166] - Allow nulls-precedence in HQL/SQM
    * [HHH-14165] - Implement support for embeddable-valued QueryParameters
    * [HHH-14164] - Verify / enable query result caching
    * [HHH-14163] - Named ResultSet mappings
    * [HHH-14162] - NativeQuery support
    * [HHH-14161] - NamedQuery support



Changes in 6.0.0.Alpha5 (April 24, 2020)
------------------------------------------------------------------------------------------------------------------------

https://hibernate.atlassian.net/browse/HHH/fixforversion/31821

** Bug
    * [HHH-13711] - H2 dialect not accurate for drop table since version 1.4.200

** Task
    * [HHH-13937] - Remove JUnit 5 as compile-time dependency
    * [HHH-13953] - Upgrade dom4j to 2.1.3



Changes in 6.0.0.Alpha4 (December 20, 2019)
------------------------------------------------------------------------------------------------------------------------

https://hibernate.atlassian.net/projects/HHH/versions/31817

** Bug
    * [HHH-13777] - UnsupportedOperationException is thrown for MappedSuperclass if the id is declared on subclasses

** Task
    * [HHH-13746] - Implement Load by Multiple Ids using SQL AST
    * [HHH-13763] - Update all load-by-key handling to use SQL AST
    * [HHH-13778] - `@OrderBy` handling using SQL AST

** Improvement
    * [HHH-13718] - secondary tables support
    * [HHH-13769] - Avoid unnecessary joins


Changes in 6.0.0.Alpha1 (November 23, 2019)
------------------------------------------------------------------------------------------------------------------------

https://hibernate.atlassian.net/projects/HHH/versions/31768/

** Sub-task
    * [HHH-13714] - HQL/Criteria UPDATE support
    * [HHH-13715] - HQL/Criteria DELETE support

** New Feature
    * [HHH-11474] - Implement support for LIMIT and OFFSET clause

** Task
    * [HHH-13395] - Update Envers to use the new Integrator signature.
    * [HHH-13725] - Implement ToOne Associations support
    * [HHH-13732] - Implement OneToOne support

** Improvement
    * [HHH-11828] - Adjust EntityMode, Tuplizer and friends to the 6.0 metamodel (Navigable et.al.) contracts
    * [HHH-13081] - Pass BootstrapContext to Integrator#integrate
    * [HHH-13224] - Look at removing references to SessionFactory from various components

** Remove Feature
    * [HHH-10071] - Remove support for "collection properties" in HQL
    * [HHH-11990] - Remove LogicalConnectionImplementor#makeShareableCopy