func createMappingUpdate()

in wal.go [159:180]

• 19 lines of code
• 6 McCabe index (conditional complexity)

func createMappingUpdate(old walMapping, tx *txWalState) walMapping {
	if !tx.Updated() {
		return nil
	}

	new := walMapping{}
	for id, walID := range old {
		if tx.free.Has(id) {
			continue
		}
		if _, exists := tx.new[id]; exists {
			continue
		}

		new[id] = walID
	}
	for id, walID := range tx.new {
		new[id] = walID
	}

	return new
}