core

type Optimizer interface {
	// Optimize optimizes the given SQL statement and returns an execution plan.
	// Returns an error if optimization fails.
	Optimize(ctx context.Context, stmt *parser.SQLStatement) (*plan.Plan, error)

	// Explain returns a string representation of the optimizer's configuration.
	Explain() string
}

type OptimizerFactory interface {
	// CreateOptimizer creates a basic optimizer for the given data source.
	CreateOptimizer(dataSource interface{}) Optimizer

	// CreateEnhancedOptimizer creates an enhanced optimizer with advanced features
	// such as cost-based optimization, index selection, and join reordering.
	CreateEnhancedOptimizer(dataSource interface{}, parallelism int) Optimizer
}