The Resource attribute is used to specify the computation cost of a user defined
function (UDF). IsStateful asserts that the function is stateful; IsExpensive
asserts that the function is expensive to compute. The information is useful in
generating better execution plan. For example, expensive associative aggregation
functions enables the use of multiple aggregation layers.
Inheritance Hierarchy
SystemAttribute
Microsoft.Research.DryadLinqResourceAttribute
Namespace: Microsoft.Research.DryadLinq
Assembly: Microsoft.Research.DryadLinq (in Microsoft.Research.DryadLinq.dll) Version: 0.2.1.0 (0.2.1.0)
Syntax
The ResourceAttribute type exposes the following members.
Constructors
| Name | Description | |
|---|---|---|
 | ResourceAttribute |
Initializes an instance of the Resource attribute. The default value of
IsStateful is true; the default value of IsExpensive is false.
|
Methods
| Name | Description | |
|---|---|---|
| Equals | Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.) |
| GetHashCode | Returns the hash code for this instance. (Inherited from Attribute.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| IsDefaultAttribute | When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.) |
| Match | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
Properties
| Name | Description | |
|---|---|---|
 | IsExpensive |
Gets and sets the IsExpensive flag.
|
| IsStateful |
Gets and sets the IsStateful flag.
|
| TypeId | When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.) |
See Also