doctrine / dbal

        $tableName = $diff->getName($this)->getQuotedName($this);

        // Dropping primary keys requires to unset autoincrement attribute on the particular column first.

        foreach ($index->getColumns() as $columnName) {

            if (! $diff->fromTable->hasColumn($columnName)) {

                continue;

            }

            $column = $diff->fromTable->getColumn($columnName);

            if ($column->getAutoincrement() === true) {

                $column->setAutoincrement(false);

                $sql[] = 'ALTER TABLE ' . $tableName . ' MODIFY ' .

                    $this->getColumnDeclarationSQL($column->getQuotedName($this), $column->toArray());

                // original autoincrement information might be needed later on by other parts of the table alteration

                $column->setAutoincrement(true);

            }

        }

        return $sql;

    }

        foreach ($diff->changedIndexes as $changedIndex) {

            // Changed primary key

            if ($changedIndex->isPrimary() && $diff->fromTable instanceof Table) {

                foreach ($diff->fromTable->getPrimaryKeyColumns() as $columnName) {

                    $column = $diff->fromTable->getColumn($columnName);

                    // Check if an autoincrement column was dropped from the primary key.

                    if ($column->getAutoincrement() && ! in_array($columnName, $changedIndex->getColumns())) {

                        // The autoincrement attribute needs to be removed from the dropped column

                        // before we can drop and recreate the primary key.

                        $column->setAutoincrement(false);

                        $sql[] = 'ALTER TABLE ' . $table . ' MODIFY ' .

                            $this->getColumnDeclarationSQL($column->getQuotedName($this), $column->toArray());

                        // Restore the autoincrement attribute as it might be needed later on

                        // by other parts of the table alteration.

                        $column->setAutoincrement(true);

                    }

                }

            }

        }