Package com.mckoi.database

Class QueryPlan.DistinctNode

java.lang.Object

com.mckoi.database.QueryPlan.SingleQueryPlanNode

com.mckoi.database.QueryPlan.DistinctNode

All Implemented Interfaces:

QueryPlanNode, java.io.Serializable, java.lang.Cloneable

Enclosing class:

QueryPlan

public static class QueryPlan.DistinctNode
extends QueryPlan.SingleQueryPlanNode

The node for performing a distinct operation on the given columns of the child node.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode

child

Constructor Summary

Constructors

Constructor	Description
DistinctNode(QueryPlanNode child, Variable[] columns)

Method Summary

Modifier and Type	Method	Description
java.lang.Object	clone()	Deep clone.
Table	evaluate(QueryContext context)	Evaluates the node and returns the result as a Table.
java.lang.String	titleString()

Methods inherited from class java.lang.Object

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

Methods inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode

child, debugString, discoverCorrelatedVariables, discoverTableNames

Constructor Detail

DistinctNode

public DistinctNode(QueryPlanNode child,
                    Variable[] columns)

Method Detail

evaluate

public Table evaluate(QueryContext context)

Description copied from interface: QueryPlanNode

Evaluates the node and returns the result as a Table. The VariableResolver resolves any outer variables

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Description copied from class: QueryPlan.SingleQueryPlanNode

Deep clone.

Specified by:

clone in interface QueryPlanNode

Overrides:

clone in class QueryPlan.SingleQueryPlanNode

Throws:

java.lang.CloneNotSupportedException

titleString

public java.lang.String titleString()

Overrides:

titleString in class QueryPlan.SingleQueryPlanNode