As far as I can tell, the graph mentioned in the code below will always be ignored:
{code}
session.byMultipleIds( Parent.class )
.with( (RootGraph) session.getEntityGraph( "eager" ), GraphSemantic.FETCH )
.multiLoad( 1, 2, 3 );
{code}
This ticket may be a duplicate of HHH-12818, but honestly I can't bring myself to consider this as an "improvement" since the API to specify an entity graph already exists (but is apparently non-functional).
Here is a branch with a reproducer: https://github.com/yrodiere/hibernate-orm/tree/multiload-graph
I also tried to start working on a fix, but this turned out to be more complex than initially anticipated. In particular:
* for some reason, with my implementation, fetch graphs apparently don't reset eager associations to lazy;
* the implementation of load graphs seem to be specific to parsed HQL queries (see {{org.hibernate.engine.query.spi.EntityGraphQueryHint#toFromElements}}, {{org.hibernate.hql.internal.ast.HqlSqlWalker#processQuery}}), and I'm not sure how to copy that implementation to {{org.hibernate.loader.entity.DynamicBatchingEntityLoaderBuilder.DynamicEntityLoader}}.
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