com.mckoi.database.QueryPlan.SingleQueryPlanNode

com.mckoi.database.QueryPlan.FunctionalSelectNode

All Implemented Interfaces:: QueryPlanNode, Serializable, Cloneable

Enclosing class:: QueryPlan

public static class QueryPlan.FunctionalSelectNode extends QueryPlan.SingleQueryPlanNode

The node for performing a functional select operation on the child node. Some examples of this type of query are; CONCAT(a, ' ', b) > 'abba boh' TONUMBER(DATEFORMAT(a, 'yyyy')) > 2001 LOWER(a) invalid input: '<' 'ook' The reason this is a separate node is because it is possible to exploit a functional indexes on a table with this node.

The given expression MUST be of the form; 'function_expression' 'operator' 'constant'

See Also:

Field Summary

Fields inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode
child
Constructor Summary

Constructors

Constructor

Description

FunctionalSelectNode(QueryPlanNode child, Expression exp)
Method Summary

Modifier and Type

Method

Description

Object

clone()

Deep clone.

ArrayList

discoverCorrelatedVariables(int level, ArrayList list)

Default implementation that discovers correlated variables for the given offset level.

ArrayList

discoverTableNames(ArrayList list)

Default implementation delegates responsibility to child.

Table

evaluate(QueryContext context)

Evaluates the node and returns the result as a Table.

Methods inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode
child, debugString, titleString

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- FunctionalSelectNode
  
  public FunctionalSelectNode(QueryPlanNode child, Expression exp)
Method Details
- 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
- discoverTableNames
  
  public ArrayList discoverTableNames(ArrayList list)
  
  Description copied from class: QueryPlan.SingleQueryPlanNode
  
  Default implementation delegates responsibility to child.
  
  Specified by:
  
  discoverTableNames in interface QueryPlanNode
  
  Overrides:
  
  discoverTableNames in class QueryPlan.SingleQueryPlanNode
- discoverCorrelatedVariables
  
  public ArrayList discoverCorrelatedVariables(int level, ArrayList list)
  
  Description copied from class: QueryPlan.SingleQueryPlanNode
  
  Default implementation that discovers correlated variables for the given offset level.
  
  Specified by:
  
  discoverCorrelatedVariables in interface QueryPlanNode
  
  Overrides:
  
  discoverCorrelatedVariables in class QueryPlan.SingleQueryPlanNode
- clone
  
  public Object clone() throws CloneNotSupportedException
  
  Description copied from class: QueryPlan.SingleQueryPlanNode
  
  Deep clone.
  
  Specified by:
  
  clone in interface QueryPlanNode
  
  Overrides:
  
  clone in class QueryPlan.SingleQueryPlanNode
  
  Throws:
  
  CloneNotSupportedException

Class QueryPlan.FunctionalSelectNode

Field Summary

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

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Details

FunctionalSelectNode

Method Details

evaluate

discoverTableNames

discoverCorrelatedVariables

clone