How to get name of a column in a RecordGroup

Function GetColumnName(pSQL Varchar2, pColumnNo ) return Varchar2 is
rg_name VARCHAR2(40) := 'rg_tmp';
rg_id RecordGroup;
cl_name;
BEGIN
rg_id := Create_Group_From_Query( rg_name, pSQL);
-- How to get columnname i.e. 2 nd column or ( pColumnNo)
return cl_name
End;

ever heard of google?
http://www.java2s.com/Tutorial/Oracle/0601__System-Packages/Usedbmssqldescribecolumns.htm

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How to get name of a column in a RecordGroup

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