java.lang.Object
- org.teiid.query.optimizer.relational.rules.RuleAssignOutputElements

All Implemented Interfaces:

OptimizerRule
```
public final class RuleAssignOutputElements
extends Object
implements OptimizerRule
```
This rule is responsible for assigning the output elements to every node in the plan. The output elements define the columns that are returned from every node. This is generally done by figuring out top-down all the elements required to execute the operation at each node and making sure those elements are selected from the children nodes.

Constructor Summary

Constructors
Constructor Description

RuleAssignOutputElements(boolean finalRun)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`PlanNode`	`execute(PlanNode plan, QueryMetadataInterface metadata, CapabilitiesFinder capFinder, RuleStack rules, AnalysisRecord analysisRecord, CommandContext context)`	Execute the rule.
`static String`	`findFunctionTarget(Function function, FunctionDescriptor fd, CapabilitiesFinder capabiltiesFinder, QueryMetadataInterface metadata)`	Find the first schema name against which this function can be executed, or null for no target
`static Set<WindowFunction>`	`getWindowFunctions(List<Expression> projectCols)`
`String`	`toString()`	Get name of the rule

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

Constructor Detail

RuleAssignOutputElements

public RuleAssignOutputElements(boolean finalRun)

Method Detail

execute

public PlanNode execute(PlanNode plan,
                        QueryMetadataInterface metadata,
                        CapabilitiesFinder capFinder,
                        RuleStack rules,
                        AnalysisRecord analysisRecord,
                        CommandContext context)
                 throws QueryPlannerException,
                        QueryMetadataException,
                        TeiidComponentException

Execute the rule. This rule is executed exactly once during every planning call. The plan is modified in place - only properties are manipulated, structure is unchanged.

Specified by:: execute in interface OptimizerRule
Parameters:: plan - The plan to execute rule on; metadata - The metadata interface; rules - The rule stack, not modified
Returns:: The updated plan
Throws:: QueryPlannerException; QueryMetadataException; TeiidComponentException

getWindowFunctions

public static Set<WindowFunction> getWindowFunctions(List<Expression> projectCols)

findFunctionTarget

public static String findFunctionTarget(Function function,
                                        FunctionDescriptor fd,
                                        CapabilitiesFinder capabiltiesFinder,
                                        QueryMetadataInterface metadata)
                                 throws TeiidComponentException,
                                        QueryMetadataException

Find the first schema name against which this function can be executed, or null for no target

Parameters:: function -; fd -; capabiltiesFinder -; metadata -
Returns:
Throws:: TeiidComponentException; QueryMetadataException

toString
```
public String toString()
```
Get name of the rule

Overrides:

toString in class Object

Returns:

Name of the rule

Class RuleAssignOutputElements

Constructor Summary