Module query_optimizer 

Query Optimizer (stub for Task 10 integration)

Provides cost-based query optimization for SOCH-QL. This is a stub implementation that will be fully implemented later.

Structs

CardinalityHint

Cardinality hint for a column or index

CostModel

Cost model configuration

QueryCost

Query cost estimate

QueryOptimizer

Query optimizer with cost-based planning

QueryPlan

Query plan from optimizer

Enums

CardinalitySource

Source of cardinality estimate

IndexSelection

Index selection recommendation

QueryOperation

Query operation types

QueryPredicate

Query predicate for optimization

TraversalDirection

Traversal direction for range queries