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

Class DataAccessRule

java.lang.Object

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

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

@API(EXPERIMENTAL)
public class DataAccessRule
extends PlannerRule<MatchPartition>

A rule that utilizes index matching information compiled by CascadesPlanner to create a logical expression for data access. While this rule delegates specifics to the MatchCandidates, the following are possible outcomes of the application of this transformation rule. Based on the match info, we may create for a single match:

• a PrimaryScanExpression for a single PrimaryScanMatchCandidate,
• an IndexScanExpression for a single ValueIndexScanMatchCandidate

The logic that this rules delegates to to actually create the expressions can be found in MatchCandidate.toScanExpression(MatchInfo).

Constructor Summary

Constructors

Constructor	Description
DataAccessRule()

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

DataAccessRule

public DataAccessRule()

Method Detail

onMatch

public void onMatch(@Nonnull
                    PlannerRuleCall call)

Specified by:

onMatch in class PlannerRule<MatchPartition>