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updated documentation

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Jan Steemann 2015-02-05 00:18:33 +01:00
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Documentation/Books/Users/Aql/Optimizer.mdpp
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@ -382,11 +382,11 @@ The following optimizer rules may appear in the `rules` attribute of a plan:
* `remove-filters-covered-by-index`: will appear if a *FilterNode* was removed or replaced
because the filter condition is already covered by an *IndexRangeNode*.
* `use-index-for-sort`: will appear if an index can be used to avoid a *SORT*
operation. If the rule was applied, a *SortNode* has been removed from the
operation. If the rule was applied, a *SortNode* was removed from the plan.
* `move-calculations-down`: will appear if a *CalculationNode* was moved down in a plan.
The intention of this rule is to move calculations down in the processing pipeline
as far as possible (below *FILTER*, *LIMIT* and *SUBQUERY* nodes) so they are executed
only when really required.
as late as possible and not before their results are required.
The following optimizer rules may appear in the `rules` attribute of cluster plans: