declare @g geography = geography::STGeomFromText('LINESTRING (45.000514 53.163967, 45.000086 53.164266, 45.000044 53.164336)', 4326)
select @g.STBuffer(13.0).ToString()Result in SQL Server 2012 compatibility mode database:
FULLGLOBE
Result in SQL Server 2008 database:
NULL
It works with size=12.959 (returns valid POLYGON) and does not with size=12.960. It works again with size=14.0 or greater.