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: sql.go
    path of file: ./repos/helm/pkg/storage/driver
    
    the code of the file until where you have to start completion: /*
Copyright The Helm Authors.

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 driver // import "helm.sh/helm/v3/pkg/storage/driver"

import (
	"fmt"
	"sort"
	"strconv"
	"time"

	"github.com/jmoiron/sqlx"
	migrate "github.com/rubenv/sql-migrate"

	sq "github.com/Masterminds/squirrel"

	// Import pq for postgres dialect
	_ "github.com/lib/pq"

	rspb "helm.sh/helm/v3/pkg/release"
)

var _ Driver = (*SQL)(nil)

var labelMap = map[string]struct{}{
	"modifiedAt": {},
	"createdAt":  {},
	"version":    {},
	"status":     {},
	"owner":      {},
	"name":       {},
}

const postgreSQLDialect = "postgres"

// SQLDriverName is the string name of this driver.
const SQLDr
    
func (s *SQL) Query(labels map[string]string) ([]*rspb.Release, error) {
	sb := s.statementBuilder.
		Select(sqlReleaseTableKeyColumn, sqlReleaseTableNamespaceColumn, sqlReleaseTableBodyColumn).
		From(sqlReleaseTableName)

	keys := make([]string, 0, len(labels))
	for key := range labels {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	for _, key := range keys {
		if _, ok := labelMap[key]; ok {
			sb = sb.Where(sq.Eq{key: labels[key]})
		} else {
			s.Log("unknown label %s", key)
			return nil, fmt.Errorf("unknown label %s", key)
		}
	}

	// If a namespace was specified, we only list releases from that namespace
	if s.namespace != "" {
		sb = sb.Where(sq.Eq{sqlReleaseTableNamespaceColumn: s.namespace})
	}

	// Build our query
	query, args, err := sb.ToSql()
	if err != nil {
		s.Log("failed to build query: %v", err)
		return nil, err
	}

	var records = []SQLReleaseWrapper{}
	if err := s.db.Select(&records, query, args...); err != nil {
		s.Log("list: failed to query with labels: %v", err)
		return nil, err
	}

	if len(records) == 0 {
		return nil, ErrReleaseNotFound
	}

	var releases []*rspb.Release
	for _, record := range records {
		release, err := decodeRelease(record.Body)
		if err != nil {
			s.Log("list: failed to decode release: %v: %v", record, err)
			continue
		}

		if release.Labels, err = s.getReleaseCustomLabels(record.Key, record.Namespace); err != nil {
			s.Log("failed to get release %s/%s custom labels: %v", record.Namespace, record.Key, err)
			return nil, err
		}

		releases = append(releases, release)
	}

	if len(releases) == 0 {
		return nil, ErrReleaseNotFound
	}

	return releases, nil
}