borinquenkid opened a new issue, #16809:
URL: https://github.com/apache/grails-core/issues/16809
Split from monolithic audit #16674 (finding F24).
### Problem Description
In non-SQL datastores (MongoDB and Neo4j), the documented aggregate subquery
forms from the GORM reference manual (e.g., `Person.where { age > avg(age) }`)
fail at runtime with:
```
MissingMethodException: No signature of method: ...avg() is applicable for
argument types: (grails.gorm.DetachedCriteria)
```
The where-query AST transformer emits a method call that MongoDB and Neo4j
criteria builders do not implement.
Both datastores have native mechanisms capable of expressing this logic:
- MongoDB can use `$expr` with an aggregation pipeline.
- Neo4j can use Cypher subqueries.
### Expected Behavior
Implement native aggregate subquery support for MongoDB and Neo4j, or
provide a clear `UnsupportedOperationException` explaining the datastore
limitation rather than an unexpected `MissingMethodException`.
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