com.mckoi.database

Class QueryPlan.NonCorrelatedAnyAllNode

java.lang.Object

com.mckoi.database.QueryPlan.BranchQueryPlanNode

com.mckoi.database.QueryPlan.NonCorrelatedAnyAllNode

All Implemented Interfaces:

QueryPlanNode, Serializable, Cloneable

Enclosing class:

QueryPlan

public static class QueryPlan.NonCorrelatedAnyAllNode
extends QueryPlan.BranchQueryPlanNode

A branch node for a non-correlated ANY or ALL sub-query evaluation. This node requires a set of columns from the left branch and an operator. The right branch represents the non-correlated sub-query.

NOTE: The cost of a SubQuery is higher if the right child result is greater than the left child result. The plan should be arranged so smaller results are on the left.

See Also:

Serialized Form

Field Summary

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

left, right

Constructor Summary

Constructors

Constructor and Description
NonCorrelatedAnyAllNode(QueryPlanNode left, QueryPlanNode right, Variable[] left_vars, Operator subquery_op)

Method Summary

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

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

debugString, discoverCorrelatedVariables, discoverTableNames, left, right

Methods inherited from class java.lang.Object

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

Constructor Detail

NonCorrelatedAnyAllNode

public NonCorrelatedAnyAllNode(QueryPlanNode left,
                               QueryPlanNode right,
                               Variable[] left_vars,
                               Operator subquery_op)

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 Object clone()
             throws CloneNotSupportedException

Description copied from class: QueryPlan.BranchQueryPlanNode

Deep clone.

Specified by:

clone in interface QueryPlanNode

Overrides:

clone in class QueryPlan.BranchQueryPlanNode

Throws:

CloneNotSupportedException

titleString

public String titleString()

Overrides:

titleString in class QueryPlan.BranchQueryPlanNode