Function compareCheckConstraints

backend/plugin/schema/differ.go:1102–1147

compareCheckConstraints compares two lists of check constraints.

(engine storepb.Engine, oldChecks, newChecks []*storepb.CheckConstraintMetadata)

// compareCheckConstraints compares two lists of check constraints.
func compareCheckConstraints(engine storepb.Engine, oldChecks, newChecks []*storepb.CheckConstraintMetadata) []*CheckConstraintDiff {
	var changes []*CheckConstraintDiff

	oldCheckMap := make(map[string]*storepb.CheckConstraintMetadata)
	for _, check := range oldChecks {
		oldCheckMap[check.Name] = check
	}

	newCheckMap := make(map[string]*storepb.CheckConstraintMetadata)
	for _, check := range newChecks {
		newCheckMap[check.Name] = check
	}

	// Check for dropped check constraints
	for checkName, oldCheck := range oldCheckMap {
		if _, exists := newCheckMap[checkName]; !exists {
			changes = append(changes, &CheckConstraintDiff{
				Action:             MetadataDiffActionDrop,
				OldCheckConstraint: oldCheck,
			})
		}
	}

	// Check for new and modified check constraints
	for checkName, newCheck := range newCheckMap {
		oldCheck, exists := oldCheckMap[checkName]
		if !exists {
			changes = append(changes, &CheckConstraintDiff{
				Action:             MetadataDiffActionCreate,
				NewCheckConstraint: newCheck,
			})
		} else if !checkConstraintsEqual(engine, oldCheck, newCheck) {
			// Drop the old constraint and recreate the new one instead of altering
			changes = append(changes, &CheckConstraintDiff{
				Action:             MetadataDiffActionDrop,
				OldCheckConstraint: oldCheck,
			})
			changes = append(changes, &CheckConstraintDiff{
				Action:             MetadataDiffActionCreate,
				NewCheckConstraint: newCheck,
			})
		}
	}

	return changes
}

// checkConstraintsEqual checks if two check constraints are equal.
func checkConstraintsEqual(engine storepb.Engine, check1, check2 *storepb.CheckConstraintMetadata) bool {