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

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

public class NewCalculateCostUtil
extends java.lang.Object

Since:

4.3

Field Summary

static int	UNKNOWN_JOIN_SCALING
static float	UNKNOWN_VALUE

Constructor Summary

NewCalculateCostUtil()

Method Summary

static float	computeCostForDepJoin(PlanNode joinNode, boolean leftIndependent, JoinNode.JoinStrategyType joinStrategy, QueryMetadataInterface metadata, CapabilitiesFinder capFinder, CommandContext context) Computes the cost of a Dependent Join The worst possible cost will arise from a high independent ndv (many dependent sets) and a low dependent ndv (possibly many matches per set) This logic uses the same assumption as criteria in that ndv is used as a divisor of cardinality.
static float	computeCostForJoin(PlanNode leftChildNode, PlanNode rightChildNode, JoinNode.JoinStrategyType joinStrategy, QueryMetadataInterface metadata, CommandContext context) Computes the cost of a Merge Join
static boolean	usesKey(Criteria crit, QueryMetadataInterface metadata)

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN_JOIN_SCALING

public static final int UNKNOWN_JOIN_SCALING

See Also:

Constant Field Values

UNKNOWN_VALUE

public static final float UNKNOWN_VALUE

See Also:

Constant Field Values

Constructor Detail

NewCalculateCostUtil

public NewCalculateCostUtil()

Method Detail

usesKey

public static boolean usesKey(Criteria crit,
                              QueryMetadataInterface metadata)
                       throws QueryMetadataException,
                              TeiidComponentException

Throws:

QueryMetadataException

TeiidComponentException

computeCostForJoin

public static float computeCostForJoin(PlanNode leftChildNode,
                                       PlanNode rightChildNode,
                                       JoinNode.JoinStrategyType joinStrategy,
                                       QueryMetadataInterface metadata,
                                       CommandContext context)
                                throws TeiidComponentException,
                                       QueryMetadataException

Computes the cost of a Merge Join

Throws:

TeiidComponentException

QueryMetadataException

computeCostForDepJoin

public static float computeCostForDepJoin(PlanNode joinNode,
                                          boolean leftIndependent,
                                          JoinNode.JoinStrategyType joinStrategy,
                                          QueryMetadataInterface metadata,
                                          CapabilitiesFinder capFinder,
                                          CommandContext context)
                                   throws TeiidComponentException,
                                          QueryMetadataException

Computes the cost of a Dependent Join The worst possible cost will arise from a high independent ndv (many dependent sets) and a low dependent ndv (possibly many matches per set) This logic uses the same assumption as criteria in that ndv is used as a divisor of cardinality.

Throws:

TeiidComponentException

QueryMetadataException