private String handleCompositeColumnName(final String columnName) {
        final String columnKey = columnName.substring(columnName.lastIndexOf(":") + 1);
        return columnKey.equals("") ? columnName : columnKey;
    }
private String handleCompositeColumnName ( final String columnName ) { final String columnKey = columnName . substring ( columnName . lastIndexOf ( ":" ) + 1 ) ; return columnKey . equals ( "" ) ? columnName : columnKey ; }
Return the actual column name from a composite column name.
<p/>
i.e. key_1:key_2:key_3:column_name

@param columnName
@return