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_iterator.go
    path of file: ./repos/badger/table
    
    the code of the file until where you have to start completion: /*
 * Copyright 2019 Dgraph Labs, Inc. and Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package table

import (
	"bytes"

	"github.com/dgraph-io/badger/v4/y"
)

// MergeIterator merges multiple iterators.
// NOTE: MergeIterator owns the array
    
func (mi *MergeIterator) fix() {
	if !mi.bigger().valid {
		return
	}
	if !mi.small.valid {
		mi.swapSmall()
		return
	}
	cmp := y.CompareKeys(mi.small.key, mi.bigger().key)
	switch {
	case cmp == 0: // Both the keys are equal.
		// In case of same keys, move the right iterator ahead.
		mi.right.next()
		if &mi.right == mi.small {
			mi.swapSmall()
		}
		return
	case cmp < 0: // Small is less than bigger().
		if mi.reverse {
			mi.swapSmall()
		} else { //nolint:staticcheck
			// we don't need to do anything. Small already points to the smallest.
		}
		return
	default: // bigger() is less than small.
		if mi.reverse {
			// Do nothing since we're iterating in reverse. Small currently points to
			// the bigger key and that's okay in reverse iteration.
		} else {
			mi.swapSmall()
		}
		return
	}
}