protected override Expression VisitStructureFieldExpression(StructureFieldExpression expression)
{
var tupleExpression = GetTupleExpression(expression);
// Materialize non-owned structure.
if (expression.Owner == null)
{
var typeInfo = expression.PersistentType;
var tuplePrototype = typeInfo.TuplePrototype;
var mappingInfo = expression.Fields
.OfType <FieldExpression>()
.Where(f => f.ExtendedType == ExtendedExpressionType.Field)
.OrderBy(f => f.Field.MappingInfo.Offset)
.Select(f => new Pair <int>(f.Field.MappingInfo.Offset, f.Mapping.Offset))
.Distinct()
.ToArray();
int[] columnMap = MaterializationHelper.CreateSingleSourceMap(tuplePrototype.Count, mappingInfo);
var persistentTupleExpression = (Expression)Expression.Call(
BuildPersistentTupleMethod,
tupleExpression,
Expression.Constant(tuplePrototype),
Expression.Constant(columnMap));
return(Expression.Convert(
Expression.Call(
WellKnownMembers.CreateStructure,
Expression.Field(itemMaterializationContextParameter, ItemMaterializationContext.SessionFieldInfo),
Expression.Constant(expression.Type),
persistentTupleExpression),
expression.Type));
}
return(MaterializeThroughOwner(expression, tupleExpression));
}
protected override Expression VisitStructureFieldExpression(StructureFieldExpression s)
{
ProcessFieldOwner(s);
AddColumns(s,
s.Fields
.Where(f => f.ExtendedType == ExtendedExpressionType.Field)
.Select(f => f.Mapping.Offset));
return(s);
}
protected override Expression VisitStructureFieldExpression(StructureFieldExpression expression)
{
return(expression);
}
protected override Expression VisitStructureFieldExpression(StructureFieldExpression expression)
{
return(expression.RemoveOwner());
}
protected virtual Expression VisitStructureFieldExpression(StructureFieldExpression expression)
{
return(expression);
}
