SqlUserDefinedAggregateAttribute.IsInvariantToDuplicates Property
Definition
Important
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Indicates whether the aggregate is invariant to duplicates.
public:
property bool IsInvariantToDuplicates { bool get(); void set(bool value); };public bool IsInvariantToDuplicates { get; set; }member this.IsInvariantToDuplicates : bool with get, setPublic Property IsInvariantToDuplicates As BooleanProperty Value
true if the aggregate is invariant to duplicates; otherwise false.
Remarks
Used by the query processor, this property is true if the aggregate is invariant to duplicates. That is, the aggregate of S, {X} is the same as aggregate of S when X is already in S. For example, aggregate functions such as MIN and MAX satisfy this property, while SUM does not.
Incorrectly setting this property can result in incorrect query results. This property is not an optimizer hint; it affects both the plan selected and the results returned by the query.