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ClassicQueryTranslatorFactory & Custom Functions Doesn't work?

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I am using hibernate 3.2.1-ga version.

I have extended the DB2Dialect and defined my own function:
registerFunction("svminus1", new NoArgSQLFunction("current time", Hibernate.TIME, false) );

It is working fine with ASTQueryTranslatorFactory

HQL: select svminus1() from Temp c where c.id=1
SQL: select current time as col_0_0_ from TEMP c0_ where c0_.ID=1

But when i use ClassicQueryTranslatorFactory, it gives me errors:
org.hibernate.QueryException: aggregate function expected before ( in SELECT [select svminus1() from Temp c where c.id=1]

Why am i getting this error?
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