I can't get row type from tuple (SPI)

Hello

I execute "select anyrowfce(..)" in plpgsql via exec_run_select

I need to get inner row, but I can't find good way for it

retval = SPI_getbinval(estate->eval_tuptable->vals[0], estate->eval_tuptable->tupdesc,1);

rettype = SPI_gettypeid(estate->eval_tuptable->tupdesc,1);
rettupdesc = lookup_rowtype_tupdesc(rettype,0);

rettupdesc is ok, but when I try SPI_getbinval(retval, rettupdesc, ...) I 
kill backend.

What I do wrong? What is optimal process to get first field in row, when 
this first field is row too.

for example I need to way for value 1 in select

select row(row(1,2,3)); => "("(1,2,3)")"

Can I get inner tupdesc without lookup_rowtype_tupdesc?

Thank you very much

Pavel Stehule

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