HHH-20339 MappedSuperclass query with embeddable path comparison against parameter throws UnsupportedOperationException

[mbellade]

Note the test was already working on 7.x as it was "fixed" by side effect of https://hibernate.atlassian.net/browse/HHH-19449

The only SQM node with a CompositeSqmPathSource as node type is SqmEmbeddedValuedSimplePath, which is also an SqmPath, so BaseSqmToSqlAstConverter#determineValueMapping always resolves it via the SqmPath branch.

That returns null when the lhs is a root but not an entity type (like in this case with the polymorphic @MappedSuperclass query). Then SqmEmbeddedValuedSimplePath#getNodeType() returns an EmbeddableTypeImpl (since the fix for HHH-19449), and MappingMetamodelImpl#resolveMappingExpressible just returns null, and the implementation resorts to resolveInferredType().

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Please make sure that the following tasks are completed:
Tasks specific to HHH-20339 (Bug):

• Add test reproducing the bug
• Add entries as relevant to migration-guide.adoc OR check there are no breaking changes

https://hibernate.atlassian.net/browse/HHH-20339

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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