Changes between Version 24 and Version 25 of DevWikiEmptyGeometry

Timestamp:

Oct 6, 2009, 3:18:25 PM (15 years ago)

Author:

chodgson

Comment:

—

DevWikiEmptyGeometry

@@ -12 +12 @@
  * ST_Difference(empty, geometry) == empty
  * ST_Distance(geometry, empty) == NULL
- * ST_DWithin(geometry, empty, tolerance) == FALSE (if distance = null, shouldn't DWithin be null?)
+ * ST_DWithin(geometry, empty, tolerance) == FALSE
+ ** I think this should be null. It is intended to be equivalent to:
+ *** distance( geometry, empty ) < tolerance
+ ** which would be equivalent to NULL < tolerance - which would be NULL by the SQL standard
  * ST_Contains(geometry, empty) == FALSE (SQL Server says False)
  * ST_Within(geometry, empty) == FALSE (SQL Server says False)