Bureaucrats, editor, reviewer, Administrators
13,550
edits
Changes
Jump to navigation
Jump to search
→Evaluation-Time Optimizations
In many cases, the amount of data to be processed is only known after the query has been compiled. Moreover, the data that is looped through expressions may change.
If sequences of items are compared against each other, a dynamic hash index will be generated, and the total number of comparisons can be significantly reduced. In the following example, <code>count($input1) * count($input2)</code> comparisons would need to be made without the intermediate indexstructure:
<syntaxhighlight lang="xquery">
