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The Collapse operator optimizes update processing. When an update is performed, it can be split (using the Split operator) into a delete and an insert. The Argument column contains a GROUP BY:() clause that specifies a list of key columns. If the query processor encounters adjacent rows that delete and insert the same key values, it replaces these separate operations with a single more efficient update operation.
Collapse is a logical and physical operator.
.gif "Collapse operator icon")
Graphical execution plan icon
See Also
Tasks
How to: Display an Actual Execution Plan
Reference
Concepts
Logical and Physical Operators Reference
Displaying Execution Plans by Using the Showplan SET Options (Transact-SQL)