gudusoft.gsqlparser.resolver2.iterative

Interface ResolutionStrategy

All Known Implementing Classes:

AdaptiveResolutionStrategy, StandardResolutionStrategy

public interface ResolutionStrategy

Strategy for iterative resolution.

Different strategies can be used for different types of SQL: - Standard strategy: Normal forward resolution - Bottom-up strategy: Resolve innermost subqueries first - Top-down strategy: Resolve outer queries first, push down requirements - Adaptive strategy: Dynamically choose based on query structure

Each strategy defines: - How to order resolution (which tables/CTEs first) - When to perform inference - When to expand star columns - When to push down column requirements

Method Summary

Modifier and Type	Method and Description
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.

Method Detail

getName

String getName()

Get the name of this strategy.

Returns:

strategy name

shouldPerformInference

boolean shouldPerformInference(int passNumber,
                               ResolutionStatistics previousStats)

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

Parameters:

passNumber - the current pass number

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

Returns:

true if inference should be performed

shouldExpandStars

boolean shouldExpandStars(int passNumber,
                          ResolutionStatistics previousStats)

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

Parameters:

passNumber - the current pass number

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

Returns:

true if star expansion should be performed

shouldPushDownColumns

boolean shouldPushDownColumns(int passNumber,
                              ResolutionStatistics previousStats)

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

Parameters:

passNumber - the current pass number

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

Returns:

true if push-down should be performed

preparePass

void preparePass(int passNumber,
                 ResolutionStatistics previousStats)

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

Parameters:

passNumber - the upcoming pass number

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

getDescription

String getDescription()

Get a description of this strategy.

Returns:

strategy description