Package gudusoft.gsqlparser.resolver2.iterative

Class AdaptiveResolutionStrategy

Object

gudusoft.gsqlparser.resolver2.iterative.AdaptiveResolutionStrategy

All Implemented Interfaces:

ResolutionStrategy

public class AdaptiveResolutionStrategy
extends Object
implements ResolutionStrategy

Adaptive resolution strategy that adjusts based on query complexity.

This strategy analyzes the resolution progress and adapts its behavior: - If progress is good: Continue with current approach - If progress stalls: Enable more aggressive techniques (inference, expansion) - If query is complex: Use more iterations - If query is simple: Use fewer iterations

Adaptation criteria: - Resolution rate (% of columns resolved) - Progress per pass (columns resolved in each iteration) - Query complexity (number of CTEs, subqueries, etc.)

Example behavior:

 Simple query (SELECT a, b FROM t1):
   Pass 1: 100% resolved -> STOP (no need for more passes)

 Complex query (multiple nested CTEs):
   Pass 1: 30% resolved -> continue
   Pass 2: 60% resolved -> enable inference
   Pass 3: 85% resolved -> enable aggressive expansion
   Pass 4: 95% resolved -> final cleanup
 

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	AdaptiveResolutionStrategy.AdaptiveState	Adaptive states.

Constructor Summary

Constructors

Constructor	Description
AdaptiveResolutionStrategy()

Method Summary

Modifier and Type	Method	Description
AdaptiveResolutionStrategy.AdaptiveState	getCurrentState()	Get the current adaptive state.
String	getDescription()	Get a description of this strategy.
String	getName()	Get the name of this strategy.
void	preparePass(int passNumber, ResolutionStatistics previousStats)	Prepare for a new pass.
boolean	shouldExpandStars(int passNumber, ResolutionStatistics previousStats)	Determine if this strategy should expand star columns in the current pass.
boolean	shouldPerformInference(int passNumber, ResolutionStatistics previousStats)	Determine if this strategy should perform inference in the current pass.
boolean	shouldPushDownColumns(int passNumber, ResolutionStatistics previousStats)	Determine if this strategy should push down column requirements in the current pass.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

AdaptiveResolutionStrategy

public AdaptiveResolutionStrategy()

Method Details

getName

public String getName()

Description copied from interface: ResolutionStrategy

Get the name of this strategy.

Specified by:

getName in interface ResolutionStrategy

Returns:

strategy name

shouldPerformInference

public boolean shouldPerformInference(int passNumber,
 ResolutionStatistics previousStats)

Description copied from interface: ResolutionStrategy

Determine if this strategy should perform inference in the current pass.

Specified by:

shouldPerformInference in interface ResolutionStrategy

Parameters:

passNumber - the current pass number

previousStats - statistics from previous pass (null for first pass)

Returns:

true if inference should be performed

shouldExpandStars

public boolean shouldExpandStars(int passNumber,
 ResolutionStatistics previousStats)

Description copied from interface: ResolutionStrategy

Determine if this strategy should expand star columns in the current pass.

Specified by:

shouldExpandStars in interface ResolutionStrategy

Parameters:

passNumber - the current pass number

previousStats - statistics from previous pass (null for first pass)

Returns:

true if star expansion should be performed

shouldPushDownColumns

public boolean shouldPushDownColumns(int passNumber,
 ResolutionStatistics previousStats)

Description copied from interface: ResolutionStrategy

Determine if this strategy should push down column requirements in the current pass.

Specified by:

shouldPushDownColumns in interface ResolutionStrategy

Parameters:

passNumber - the current pass number

previousStats - statistics from previous pass (null for first pass)

Returns:

true if push-down should be performed

preparePass

public void preparePass(int passNumber,
 ResolutionStatistics previousStats)

Description copied from interface: ResolutionStrategy

Prepare for a new pass. Strategy can adjust its behavior based on previous results.

Specified by:

preparePass in interface ResolutionStrategy

Parameters:

passNumber - the upcoming pass number

previousStats - statistics from previous pass (null for first pass)

getDescription

public String getDescription()

Description copied from interface: ResolutionStrategy

Get a description of this strategy.

Specified by:

getDescription in interface ResolutionStrategy

Returns:

strategy description

getCurrentState

public AdaptiveResolutionStrategy.AdaptiveState getCurrentState()

Get the current adaptive state.

Returns:

current state

toString

public String toString()

Overrides:

toString in class Object