syntax error: at or near "‹)›"

[Kikkon]

Hi I'm currently facing an issue while use postgresql-parser. During my usage, I encountered an error with the following code snippet:

code:

	sql := "SELECT PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY id) FROM test_table"
	stmt, err := parser.ParseOne(sql)

error msg:

 "syntax error: at or near "‹)›"

I'm not very familiar with the inner workings of the parser and would greatly appreciate any assistance you can provide. I'm more than willing to contribute code to fix this problem if you could kindly point me in the right direction.