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Brett Meyer commented on an issue

Please see

~~HHH-8092~~ and ~~HHH-8162~~ , then re-try your test case in 4.2.1 or later. ~~HHH-8092~~ specifically should fix what you're seeing.

Note that you're misunderstanding how dialect.getUniqueDelegate().applyUniqueToColumn( col ) works. See the UniqueDelegate interface's javadocs. applyUniqueToColumn is relevant only to Dialects that do not support adding a constraint through an "alter table" statement, so it returns empty string by default.

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Hibernate ORM /

HHH-8120

Update schema doesn't create unique constraints.

When property *hibernate.hbm2ddl.auto* is set to *update*, unique constraints will not be generated, when set to
*create* unique constraints will be generated.

Description of source code which produces this error
When schema is updated the method
{noformat}
org.hibernate.cfg.Configuration.gene...

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