unstable results from st_orderingequals (again!)

[strk]

strk=# \a \t
Output format is unaligned.
Showing only tuples.
strk=# select st_orderingequals('POINT EMPTY', 'POINT EMPTY');
f
strk=# select st_orderingequals('POINT EMPTY', 'POINT EMPTY');
t

In case you don't see it: first call returns FALSE, second call returns TRUE. Calls are perfectly identical.

[strk]

casting text to geometry returns true at first go

[strk]

NOTICE: lwgeom_same returned 0

[strk]

NOTICE: bbox1:0x7fd547e5cfb0, bbox2:0x7fd547e5d0b0 NOTICE: [lwgeom.c:lwgeom_same:494] bounding boxes differ

It makes no sense for POINT EMPTY to have a non-NULL bbox pointer in LWGEOM. That must be the issue.

[strk]

Deserializer's fault, where gserialized_read_gbox_p computes the BOX for an empty point, _assuming_ there are points... It instead reads garbage and possibly return different data.

[strk]

Fixed in r8785