                    $quotedParts[] = $this->quoteIdentifier(trim($part));
                }

                $this->groupBy = implode(", ", $quotedParts);
            }
        }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.