Package com.apple.foundationdb.record.query.plan.temp.rules

Class PushDistinctFilterBelowFilterRule

java.lang.Object

com.apple.foundationdb.record.query.plan.temp.PlannerRule<RecordQueryUnorderedPrimaryKeyDistinctPlan>

com.apple.foundationdb.record.query.plan.temp.rules.PushDistinctFilterBelowFilterRule

public class PushDistinctFilterBelowFilterRule
extends PlannerRule<RecordQueryUnorderedPrimaryKeyDistinctPlan>

A rule that moves a RecordQueryUnorderedPrimaryKeyDistinctPlan below a RecordQueryFilterPlan. While this doesn't make a difference in terms of plan semantics it ensures that the generated plans have the same form as those produced by the RecordQueryPlanner.

 
     +----------------------------------------------+             +----------------------------------+
     |                                              |             |                                  |
     |  RecordQueryUnorderedPrimaryKeyDistinctPlan  |             |  RecordQueryPredicateFilterPlan  |
     |                                              |             |                           pred'  |
     +---------------------+------------------------+             |                                  |
                           |                                      +---------------+------------------+
                           |                        +----->                       |
                           |                                                      | newQun
           +---------------+------------------+                                   |
           |                                  |             +---------------------+------------------------+
           |  RecordQueryPredicateFilterPlan  |             |                                              |
           |                            pred  |             |  RecordQueryUnorderedPrimaryKeyDistinctPlan  |
           |                                  |             |                                              |
           +---------------+------------------+             +---------------------+------------------------+
                           |                                                    /
                           | qun                                               /
                           |                                                  /
                    +------+------+                                          /
                    |             |                                         /
                    |   any ref   | ---------------------------------------+
                    |             |
                    +-------------+
 
 

where pred' is rebased along the translation from qun to newQun.

Constructor Summary

Constructors

Constructor	Description
PushDistinctFilterBelowFilterRule()

Method Summary

Modifier and Type	Method	Description
void	onMatch(PlannerRuleCall call)

Methods inherited from class com.apple.foundationdb.record.query.plan.temp.PlannerRule

getMatcher, getRootOperator, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PushDistinctFilterBelowFilterRule

public PushDistinctFilterBelowFilterRule()

Method Detail

onMatch

public void onMatch(@Nonnull
                    PlannerRuleCall call)

Specified by:

onMatch in class PlannerRule<RecordQueryUnorderedPrimaryKeyDistinctPlan>