thecodingmachine / magic-query

        return $sql;

    }

    protected function processTableExpression($parsed, $index)

    {

        if ($parsed['expr_type'] !== ExpressionType::TABLE_EXPRESSION) {

            return '';

        }

        $sql = substr($this->processFROM($parsed['sub_tree']), 5); // remove FROM keyword

        $sql = '('.$sql.')';

        $sql .= $this->processAlias($parsed['alias']);

        if ($index !== 0) {

            $sql = $this->processJoin($parsed['join_type']).' '.$sql;

            $sql .= $this->processRefType($parsed['ref_type']);

            $sql .= $this->processRefClause($parsed['ref_clause']);

        }

        return $sql;

    }

    protected function processSubQuery($parsed, $index = 0)

    {

        return $sql;

    }

    protected function processSubQuery($parsed, $index = 0)

    {

        if ($parsed['expr_type'] !== ExpressionType::SUBQUERY) {

            return '';

        }

        $sql = $this->processSelectStatement($parsed['sub_tree']);

        $sql = '('.$sql.')';

        if (isset($parsed['alias'])) {

            $sql .= $this->processAlias($parsed['alias']);

        }

        if ($index !== 0) {

            $sql = $this->processJoin($parsed['join_type']).' '.$sql;

            $sql .= $this->processRefType($parsed['ref_type']);

            $sql .= $this->processRefClause($parsed['ref_clause']);

        }

        return $sql;

    }

    protected function processOperator($parsed)

    {