protected HqlTreeNode VisitNhAverage(NhAverageExpression expression)
{
var hqlExpression = VisitExpression(expression.Expression).AsExpression();
if (expression.Type != expression.Expression.Type)
{
hqlExpression = _hqlTreeBuilder.Cast(hqlExpression, expression.Type);
}
return(_hqlTreeBuilder.Cast(_hqlTreeBuilder.Average(hqlExpression), expression.Type));
}
protected HqlTreeNode VisitNhAverage(NhAverageExpression expression)
{
// We need to cast the argument when its type is different from Average method return type,
// otherwise the result may be incorrect. In SQL Server avg always returns int
// when the argument is int.
var hqlExpression = VisitExpression(expression.Expression).AsExpression();
hqlExpression = IsCastRequired(expression.Expression, expression.Type, out _)
? (HqlExpression)_hqlTreeBuilder.Cast(hqlExpression, expression.Type)
: _hqlTreeBuilder.TransparentCast(hqlExpression, expression.Type);
// In Oracle the avg function can return a number with up to 40 digits which cannot be retrieved from the data reader due to the lack of such
// numeric type in .NET. In order to avoid that we have to add a cast to trim the number so that it can be converted into a .NET numeric type.
return(_hqlTreeBuilder.Cast(_hqlTreeBuilder.Average(hqlExpression), expression.Type));
}
protected virtual Expression VisitNhAverage(NhAverageExpression expression)
{
return(VisitUnhandledItem <NhAverageExpression, Expression>(expression, "VisitNhAverage", BaseVisitNhAverage));
}
protected virtual Expression BaseVisitNhAverage(NhAverageExpression expression)
{
Expression nx = base.VisitExpression(expression.Expression);
return(nx != expression.Expression ? new NhAverageExpression(nx) : expression);
}
protected HqlTreeNode VisitNhAverage(NhAverageExpression expression)
{
return(_hqlTreeBuilder.Cast(_hqlTreeBuilder.Average(VisitExpression(expression.Expression).AsExpression()), expression.Type));
}
protected virtual Expression VisitNhAverage(NhAverageExpression expression)
{
return(expression.Accept(this));
}
protected internal virtual Expression VisitNhAverage(NhAverageExpression expression)
{
return(VisitNhAggregated(expression));
}
