You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: merge.go
    path of file: ./repos/sealer/vendor/sigs.k8s.io/kustomize/kyaml/kio/filters
    
    the code of the file until where you have to start completion: // Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0

// Package merge contains libraries for merging Resources and Patches
package filters

import (
	"sigs.k8s.io/kustomize/kyaml/kio"
	"sigs.k8s.io/kustomize/kyaml/yaml"
	"sigs.k8s.io/kustomize/kyaml/yaml/merge2"
)

// MergeFilter merges Resources with the Group/Version/Kind/Namespace/Name together using
// a 2-way merge strategy.
//
// - Fields set to null in the source will be cleared from the destination
// - Fields with matching keys will be merged r
    
func (c MergeFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
	// invert the merge precedence
	if c.Reverse {
		for i, j := 0, len(input)-1; i < j; i, j = i+1, j-1 {
			input[i], input[j] = input[j], input[i]
		}
	}

	// index the Resources by G/V/K/NS/N
	index := map[mergeKey][]*yaml.RNode{}
	// retain the original ordering
	var order []mergeKey
	for i := range input {
		meta, err := input[i].GetMeta()
		if err != nil {
			return nil, err
		}
		key := mergeKey{
			apiVersion: meta.APIVersion,
			kind:       meta.Kind,
			namespace:  meta.Namespace,
			name:       meta.Name,
		}
		if _, found := index[key]; !found {
			order = append(order, key)
		}
		index[key] = append(index[key], input[i])
	}

	// merge each of the G/V/K/NS/N lists
	var output []*yaml.RNode
	var err error
	for _, k := range order {
		var merged *yaml.RNode
		resources := index[k]
		for i := range resources {
			patch := resources[i]
			if merged == nil {
				// first resources, don't merge it
				merged = resources[i]
			} else {
				merged, err = merge2.Merge(patch, merged, yaml.MergeOptions{
					ListIncreaseDirection: yaml.MergeOptionsListPrepend,
				})
				if err != nil {
					return nil, err
				}
			}
		}
		output = append(output, merged)
	}
	return output, nil
}