com.mckoi.database

Class QueryPlan.CompositeNode

java.lang.Object

com.mckoi.database.QueryPlan.BranchQueryPlanNode

com.mckoi.database.QueryPlan.CompositeNode

All Implemented Interfaces:

QueryPlanNode, Serializable, Cloneable

Enclosing class:

QueryPlan

public static class QueryPlan.CompositeNode
extends QueryPlan.BranchQueryPlanNode

A branch node for performing a composite function on two child nodes. This branch is used for general UNION, EXCEPT, INTERSECT composites. The left and right branch results must have the same number of columns and column types.

See Also:

Serialized Form

Field Summary

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

left, right

Constructor Summary

Constructors

Constructor and Description
CompositeNode(QueryPlanNode left, QueryPlanNode right, int composite_op, boolean all_op)

Method Summary

Modifier and Type	Method and Description
Table	evaluate(QueryContext context) Evaluates the node and returns the result as a Table.

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

clone, debugString, discoverCorrelatedVariables, discoverTableNames, left, right, titleString

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeNode

public CompositeNode(QueryPlanNode left,
                     QueryPlanNode right,
                     int composite_op,
                     boolean all_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