Cake\Database\Schema\SqliteSchema::convertIndexDescription PHP Method

    public function convertIndexDescription(Table $table, $row)
    {
        $sql = sprintf('PRAGMA index_info(%s)', $this->_driver->quoteIdentifier($row['name']));
        $statement = $this->_driver->prepare($sql);
        $statement->execute();
        $columns = [];
        foreach ($statement->fetchAll('assoc') as $column) {
            $columns[] = $column['name'];
        }
        $statement->closeCursor();
        if ($row['unique']) {
            $table->addConstraint($row['name'], ['type' => Table::CONSTRAINT_UNIQUE, 'columns' => $columns]);
        } else {
            $table->addIndex($row['name'], ['type' => Table::INDEX_INDEX, 'columns' => $columns]);
        }
    }