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Robin Sander commented on an issue

With Hibernate ORM 4.2.5 at least the NPE in CastFunction.render() is gone when using an explicit cast with Postgresql Dialect.

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Hibernate ORM /

HHH-6385

Some dialects register a special function for the aggregate function 'avg'. For example, HSQLDialect calls {{registerFunction("avg", new AvgWithArgumentCastFunction("double"))}}
which is used if {{avg}} appears in a select statement but not if {{avg}} appears in an {{order by}} statement which leads to wrong results.

For exampe, the following query
{code...

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