Arrayslice support for postgresql

[pantonis]

I have this query

SELECT
    ARRAY_TO_STRING(
        (ARRAY_AGG("EmployeeName" ORDER BY "Salary" DESC))[1:10],
        ', '
    ) AS top10_employees,
    ARRAY_TO_STRING(
        (ARRAY_AGG("EmployeeName" ORDER BY "Salary" ASC))[1:10],
        ', '
    ) AS bottom10_employees
FROM
    "Employee";

but the parser fails to parse it correctly when I try to convert it back to sql I get

SELECT
        ARRAY_TO_STRING((ARRAY_AGG("EmployeeName" ORDER BY "Salary" DESC))
		[LiteralValue { Value = Number { Value = 1, Long = False } }:LiteralValue { Value = Number { Value = 10, Long = False } }], ', ') AS top10_employees,
        ARRAY_TO_STRING((ARRAY_AGG("EmployeeName" ORDER BY "Salary" ASC))
		[LiteralValue { Value  = Number { Value = 1, Long = False } }:LiteralValue { Value = Number { Value = 10, Long = False } }], ', ') AS bottom10_employees
FROM
        Employee