src/Phossa/Query/Clause/TableConstraintTrait.php
protected function quoteIndex(array $cols)/*# : array */
    {
        $q = [];
        foreach ($cols as $col) {
            $q[] = $this->quoteLeading($col);
        }
        return $q;
    }
protected function quoteIndex(array $cols)/*# : array */
    {
        $q = [];
        foreach ($cols as $col) {
            $q[] = $this->quoteLeading($col);
        }
        return $q;
    }
quote the index names in the array

@param  array $cols
@return array
@access protected