[postgis-users] ST_Union on empty polygon loses SRID

[Jonathan Schultz]

Hello,

I have found with a query that makes a union of geometries which 
includes an empty polygon produces a result without an SRID. For a 
trivial example:

> => select ST_SRID(ST_Union(ST_GeomFromText('POLYGON EMPTY', 4283)));
>  st_srid ---------
>        0

This seems like a bug to me but maybe there is a good explanation?

Thanks,
Jonathan
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