Hi
>> + {
>> + /* the last field of list can be star too */
>> + Assert(IsA(field2, A_Star));
>> +
>> + /*
>> + * In this case, the field1 should be variable name. But
>> + * direct unboxing of composite session variables is not
>> + * supported now, and then we don't need to try lookup
>> + * related variable.
>> + *
>> + * Unboxing is supported by syntax (var).*
>> + */
>> + return InvalidOid;
>> + }
>> I don't fully understand the above comments,
>>
>
> The parser allows only two syntaxes - identifier.identifier or
> identifier.star. Second
> syntax is not supported by session variables, and then I didn't try to
> search for the variable.
> Some users can be confused by similar syntaxes identifier.* and
> (identifier).* Only
> second syntax is composite unboxing, and only second syntax is supported
> for
> session variables.
>
>
I changed this comment to
<--><--><--><--><-->/*
<--><--><--><--><--> * The syntax ident.* is used only by table aliases,
<--><--><--><--><--> * and then this identifier cannot be a reference to
<--><--><--><--><--> * session variable.
<--><--><--><--><--> */
