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: record_batch.go
    path of file: ./repos/cockroach/pkg/col/colserde
    
    the code of the file until where you have to start completion: // Copyright 2019 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

package colserde

import (
	"encoding/binary"
	"io"

	"github.com/apache/arrow/go/arrow/array"
	"github.com/apache/arrow/go/arrow/memory"
	"github.com/cockroachdb/cockroach/pkg/col/colserde/arrowserde"
	"github.com/cockroachdb/cockroach/pkg/col/typeconv"
	"github.com/cockroachdb/cockroach/pkg/sql/types"
	"github.com/cockroachdb/errors"
	flatbuffers "github.com/google/flatbuffers/go"
)

const (
	// metadataLengthNumBytes is the number of bytes used to encode the length of
	// the metadata in bytes. These are the first bytes of any arrow IPC message.
	metadataLengthNumBytes           = 4
	flatbufferBuilderInitialCapacity = 1024
)

// numBuffersForType returns how many buffers are used to represent an array of
// the given type.
//
//gcassert:inline
func numBuffersForType(t *types.T) int {
	// Most types are represented by 3 memory.Buffers (because most types are
	// serialized into flat bytes representation). One buffer for the null
	// bitmap, one for the values, and one for the offsets.
	numBuffers := 3
	switch typeconv.TypeFamilyToCanonicalTypeFamily(t.Family()) {
	case types.BoolFamily, types.FloatFamily, types.IntFamily:
		// This type doesn't have an offsets buffer.
		numBuffers = 2
	}
	return numBuffers
}

// RecordBatchSerializer serializes RecordBatches in the standard Apache Arrow
// IPC format using flatbuffers. Note that only RecordBatch messages are
// supported. This is because the full spec would be too much to support
// (support for DictionaryBatches, Tensors, SparseTensors, and Schema
// messages would be needed) and we only need the part of the spec that allows
// us to send data.
// The IPC format is described here:
// https://arrow.apache.org/docs/format/IPC.html
type RecordBatchSerializer struct {
	// numBuffers holds the number of buffers needed to represent an arrow array
	// of the type at the corresponding index of typs passed in in
	// NewRecordBatchSerializer.
	numBuffers []int

	builder *flatbuffers.Builder
	scratch struct {
		bufferLens     []int
		metadataLength [metadataLengthNumBytes]byte
		// padding is used to align metadata to an 8 byte boundary, so doesn't
		// need to be larger than 7 bytes.
		padding [7]byte
	}
}

// NewRecordBatchSerializer creates a new Reco
    
func (s *RecordBatchSerializer) Deserialize(data *[]array.Data, bytes []byte) (int, error) {
	// Read the metadata by first reading its length.
	metadataLen := int(binary.LittleEndian.Uint32(bytes[:metadataLengthNumBytes]))
	metadata := arrowserde.GetRootAsMessage(
		bytes[metadataLengthNumBytes:metadataLengthNumBytes+metadataLen], 0,
	)

	bodyBytes := bytes[metadataLengthNumBytes+metadataLen : metadataLengthNumBytes+metadataLen+int(metadata.BodyLength())]

	// We don't check the version because we don't fully support arrow
	// serialization/deserialization so it's not useful. Refer to the
	// RecordBatchSerializer struct comment for more information.
	_ = metadata.Version()

	if metadata.HeaderType() != arrowserde.MessageHeaderRecordBatch {
		return 0, errors.Errorf(
			`cannot decode RecordBatch from %s message`,
			arrowserde.EnumNamesMessageHeader[metadata.HeaderType()],
		)
	}

	var (
		headerTab flatbuffers.Table
		header    arrowserde.RecordBatch
	)

	if !metadata.Header(&headerTab) {
		return 0, errors.New(`unable to decode metadata table`)
	}

	header.Init(headerTab.Bytes, headerTab.Pos)
	if len(s.numBuffers) != header.NodesLength() {
		return 0, errors.Errorf(
			`mismatched schema and header lengths: %d != %d`, len(s.numBuffers), header.NodesLength(),
		)
	}

	var (
		node arrowserde.FieldNode
		buf  arrowserde.Buffer
	)
	for fieldIdx, bufferIdx := 0, 0; fieldIdx < len(s.numBuffers); fieldIdx++ {
		header.Nodes(&node, fieldIdx)

		// Make sure that this node (i.e. column buffer) is the same length as the
		// length in the header, which specifies how many rows there are in the
		// message body.
		if node.Length() != header.Length() {
			return 0, errors.Errorf(
				`mismatched field and header lengths: %d != %d`, node.Length(), header.Length(),
			)
		}

		// Decode the message body by using the offset and length information in the
		// message header.
		// TODO(yuzefovich): reuse these buffers across Deserialize calls.
		buffers := make([]*memory.Buffer, s.numBuffers[fieldIdx])
		for i := 0; i < s.numBuffers[fieldIdx]; i++ {
			header.Buffers(&buf, bufferIdx)
			bufData := bodyBytes[buf.Offset() : buf.Offset()+buf.Length()]
			if i < len(buffers)-1 {
				// We need to cap the slice so that bufData's capacity doesn't
				// extend into the data of the next buffer if this buffer is not
				// the last one (meaning there is that next buffer).
				bufData = bufData[:buf.Length():buf.Length()]
			}
			buffers[i] = memory.NewBufferBytes(bufData)
			bufferIdx++
		}

		*data = append(
			*data,
			*array.NewData(
				nil, /* dType */
				int(header.Length()),
				buffers,
				nil, /* childData. Note that we do not support types with childData */
				int(node.NullCount()),
				0, /* offset */
			),
		)
	}

	return int(header.Length()), nil
}