Postgres pgx driver hangs on commit - postgresql

Question

I have a function that updates records in table and requests it using pgx Postgres driver. This function hangs on commit. Is there any ideas why does it happen? Why I can't use transactions in this case?
Of course, as the query is atomic I can remove transactions. But it's still unclear—why it happens and what to do if I need a transaction.
func (r *Repository) GetUpdatedItems(ctx context.Context, filters []string) ([]Item, error) {
conn, err := r.pool.Acquire(ctx)
// error handling
defer conn.Release()
tx, err := conn.Begin(ctx)
// error handling
defer func() {
closeCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
defer cancel()
_ = tx.Rollback(closeCtx)
}()
query := fmt.Sprintf(`UPDATE %s
SET fieldOne = $1, fieldTwo = $2
WHERE otheField = '' OR otherField IS NULL
RETURNING fieldOne, fieldTwo, otheField, someMoreField;`,
r.tableName, sqlArray(aggregatesTypes))
rows, err := conn.Query(ctx, query, filters[0], filters[1])
// error handling
defer rows.Close()
var retItems []reaper.Item
for rows.Next() {
var fieldOne string
var fieldTwo string
var otheField string
var someMoreField string
if err := rows.Scan(&id, &fieldOne, &fieldTwo, &otheField, &someMoreField); err != nil {
return nil, fmt.Errorf("failed to scan item: %w", err)
}
item := Item{
FieldOne: fieldOne,
FieldTwo: fieldTwo,
OtheField: otheField,
SomeMoreField: someMoreField
}
retItems = append(retItems, item)
}
if err := tx.Commit(ctx); err != nil {
return nil, fmt.Errorf("failed to commit transaction: %w", err)
}
return retItems, nil
}

Answer 1

tx.Query must be used instead of conn.Query.
Thanks for the help!