org.teiid.query.optimizer.relational.rules
Class RuleDecomposeJoin

java.lang.Object
  org.teiid.query.optimizer.relational.rules.RuleDecomposeJoin

All Implemented Interfaces:

OptimizerRule

public class RuleDecomposeJoin
extends java.lang.Object
implements OptimizerRule

Perform the optimization:

                  source
 inner join         union all
   source             inner join
     union all  =>      source
       a                  a
       b                source
   source                 c
     union all        inner join
       c                source
       d                  b
                        source
                          d
 

TODO: non-ansi joins

Constructor Summary

RuleDecomposeJoin()

Method Summary

PlanNode	decomposeJoin(PlanNode joinNode, PlanNode root, QueryMetadataInterface metadata, CommandContext context)
PlanNode	execute(PlanNode plan, QueryMetadataInterface metadata, CapabilitiesFinder capabilitiesFinder, RuleStack rules, AnalysisRecord analysisRecord, CommandContext context)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RuleDecomposeJoin

public RuleDecomposeJoin()

Method Detail

execute

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

Specified by:

execute in interface OptimizerRule

Throws:

QueryPlannerException

QueryMetadataException

TeiidComponentException

decomposeJoin

public PlanNode decomposeJoin(PlanNode joinNode,
                              PlanNode root,
                              QueryMetadataInterface metadata,
                              CommandContext context)
                       throws TeiidComponentException,
                              QueryPlannerException

Throws:

TeiidComponentException

QueryPlannerException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object