Carsten Kropf wrote:
The usage of static types with fixed length was actually no problem
for me, so I proceeded to variable length types.
I created an n-dimensional point structure called "PointND" that
contains a field of float8 values of dynamic length. I also put in a
int4/int32 field for the length specification, as required by the
documentation. So the structure looks like the following:
struct PointND
{
int32 dimensions;
float8 coordinates[1];
};
The structure should begin with a int32 vl_len_ header. At creation /
palloc time the size must be set with the SET_VARSIZE macro, and the
size can be queried with the VARSIZE_ * macros -> doxygen.postgresql.org
is your friend here. Take a look at e.g. contrib/cube for examples.
regards,
Yeb Havinga
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