Oh, I see, does the VARSIZE length field have to be the total number of bytes 
occupied (including VARHDRSZ and the size of the structure) or only the size 
that is used by "my" datatype? Then it would become pretty much obvious, why 
this is not supposed to work.
I'll try it out then.

regards
        Carsten Kropf
Am 10.02.2010 um 12:04 schrieb Yeb Havinga:

> Carsten Kropf wrote:
>> Actually, I thought, I did this using the int32 variable called "dimension" 
>> which should be exactly this field.
> yes.
>> in = (PointND *) palloc(sizeof(float8) * dimensions + VARHDRSZ);
>> SET_VARSIZE(in, dimensions);
> What about
> 
> len = sizeof(float8) * dimensions + VARHDRSZ;
> in = (PointND *) palloc0(len);
> SET_VARSIZE(in, len);
> 
> 
> 
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