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

Class FullUnorderedScanExpression

java.lang.Object

com.apple.foundationdb.record.query.plan.temp.expressions.FullUnorderedScanExpression

All Implemented Interfaces:

Bindable, PlannerGraphRewritable, RelationalExpression

@API(EXPERIMENTAL)
public class FullUnorderedScanExpression
extends Object
implements RelationalExpression, PlannerGraphRewritable

A planner expression representing a full, unordered scan of the records by primary key, which is the logical version of a RecordQueryScanPlan with ScanComparisons.EMPTY. Unlike a RecordQueryScanPlan, a FullUnorderedScanExpression is not implicitly ordered by the primary key.

This expression is useful as the source of records for the initial planner expression produced from a RecordQuery.

Constructor Summary

Constructors

Constructor	Description
FullUnorderedScanExpression(Set<String> recordTypes)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
boolean	equalsWithoutChildren(RelationalExpression otherExpression)
List<? extends Quantifier>	getQuantifiers()	Return an iterator of references to the children of this planner expression.
Set<String>	getRecordTypes()
int	hashCode()
PlannerGraph	rewritePlannerGraph(List<? extends PlannerGraph> childGraphs)	Method to rewrite the planner graph.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.apple.foundationdb.record.query.plan.temp.RelationalExpression

acceptPropertyVisitor, bindTo, show

Constructor Detail

FullUnorderedScanExpression

public FullUnorderedScanExpression(Set<String> recordTypes)

Method Detail

getRecordTypes

@Nonnull
public Set<String> getRecordTypes()

getQuantifiers

@Nonnull
public List<? extends Quantifier> getQuantifiers()

Description copied from interface: RelationalExpression

Return an iterator of references to the children of this planner expression. The iterators returned by different calls are guaranteed to be independent (i.e., advancing one will not advance another). However, they might point to the same object, as when Collections.emptyIterator() is returned. The returned iterator should be treated as an immutable object and may throw an exception if Iterator.remove() is called. The iterator must return its elements in a consistent order.

Specified by:

getQuantifiers in interface RelationalExpression

Returns:

an iterator of references to the children of this planner expression

equalsWithoutChildren

public boolean equalsWithoutChildren(@Nonnull
                                     RelationalExpression otherExpression)

Specified by:

equalsWithoutChildren in interface RelationalExpression

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

rewritePlannerGraph

@Nonnull
public PlannerGraph rewritePlannerGraph(@Nonnull
                                        List<? extends PlannerGraph> childGraphs)

Description copied from interface: PlannerGraphRewritable

Method to rewrite the planner graph.

Specified by:

rewritePlannerGraph in interface PlannerGraphRewritable

Parameters:

childGraphs - planner graphs of children expression that already have been computed

Returns:

a new planner graph that can combine the childGraphs in a meaningful way. Note that there is no obligation to use the childGraphs at all, this method can create a new independent planner graph completely from scratch.