-- Tests for less-than (<) operator on rdfnode type
\pset null NULL
-- Numeric comparisons
SELECT '"1"^^xsd:int'::rdfnode < '"2"^^xsd:int'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"1"^^xsd:int'::rdfnode < '"1"^^xsd:int'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '"42.0"^^xsd:decimal'::rdfnode < '"42.1"^^xsd:decimal'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"42.0"^^xsd:double'::rdfnode < '"42.0"^^xsd:decimal'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '"0.0"^^xsd:decimal'::rdfnode < '"-0.0"^^xsd:decimal'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '"1e308"^^xsd:double'::rdfnode < '"INF"^^xsd:double'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"42"^^xsd:int'::rdfnode < '"43"^^xsd:short'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"42"^^xsd:byte'::rdfnode < '"42"^^xsd:int'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

-- Date and time
SELECT '"2020-01-01"^^xsd:date'::rdfnode < '"2021-01-01"^^xsd:date'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"2025-04-25T18:45:00"^^xsd:dateTime'::rdfnode < '"2025-04-25T18:45:00"^^xsd:dateTime'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '"18:44:38"^^xsd:time'::rdfnode < '"18:45:00"^^xsd:time'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"2025-04-25T14:00:00+02:00"^^xsd:dateTime'::rdfnode < '"2025-04-25T12:00:00Z"^^xsd:dateTime'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '"2025-04-25T12:00:00"^^xsd:dateTime'::rdfnode < '"2025-04-25T12:00:00Z"^^xsd:dateTime'::rdfnode; -- Error or defined behavior
 ?column? 
----------
 f
(1 row)

-- String and simple literals
SELECT '"abc"^^xsd:string'::rdfnode < '"abd"^^xsd:string'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"abc"^^xsd:string'::rdfnode < '"abc"^^xsd:string'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '"a"'::rdfnode < '"b"'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '""^^xsd:string'::rdfnode < '"a"^^xsd:string'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"\u00E9"^^xsd:string'::rdfnode < '"\u00EA"^^xsd:string'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

-- Language-tagged literals
SELECT '"a"@en'::rdfnode < '"b"@en'::rdfnode; -- ERROR: cannot compare language-tagged literals
ERROR:  cannot compare language-tagged literals
SELECT '"chat"@en'::rdfnode < '"chat"@fr'::rdfnode; -- ERROR: cannot compare language-tagged literals
ERROR:  cannot compare language-tagged literals
SELECT '"abc"@de'::rdfnode < '"abc"@en'::rdfnode; -- ERROR: cannot compare language-tagged literals
ERROR:  cannot compare language-tagged literals
SELECT '"abc"@en'::rdfnode < '"abc"@EN'::rdfnode; -- ERROR: cannot compare language-tagged literals
ERROR:  cannot compare language-tagged literals
-- xsd:anyURI comparisons
SELECT '"http://a"^^xsd:anyURI'::rdfnode < '"http://b"^^xsd:anyURI'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"http://a"^^xsd:anyURI'::rdfnode < '"http://a"^^xsd:anyURI'::rdfnode; -- Returns t
 ?column? 
----------
 f
(1 row)

SELECT '""^^xsd:anyURI'::rdfnode < '"http://b"^^xsd:anyURI'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"http://\u00E9"^^xsd:anyURI'::rdfnode < '"http://\u00EA"^^xsd:anyURI'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

-- Incompatible datatype comparisons
SELECT '"41"'::rdfnode < '"42"^^xsd:int'::rdfnode; -- ERROR: cannot compare literals of different datatypes
ERROR:  cannot compare literals of different datatypes
SELECT '"abc"^^xsd:string'::rdfnode < '"2020-01-01"^^xsd:date'::rdfnode; -- ERROR: cannot compare literals of different datatypes
ERROR:  cannot compare literals of different datatypes
SELECT '"2020-01-01"^^xsd:date'::rdfnode < '"abc"^^xsd:string'::rdfnode; -- ERROR: cannot compare literals of different datatypes
ERROR:  cannot compare literals of different datatypes
SELECT '"41"^^xsd:int'::rdfnode < '"42"^^ex:customDatatype'::rdfnode; -- ERROR: cannot compare literals of different datatypes
ERROR:  cannot compare literals of different datatypes
-- NaN and infinities
SELECT '"42"^^xsd:double'::rdfnode < '"NaN"^^xsd:double'::rdfnode; -- Returns f
 ?column? 
----------
 f
(1 row)

SELECT '"NaN"^^xsd:double'::rdfnode < '"NaN"^^xsd:double'::rdfnode; -- Returns f
 ?column? 
----------
 f
(1 row)

SELECT '"NaN"^^xsd:double'::rdfnode < '"42"^^xsd:double'::rdfnode; -- Returns f
 ?column? 
----------
 f
(1 row)

SELECT '"999999999"^^xsd:double'::rdfnode < '"INF"^^xsd:double'::rdfnode; -- Returns t
 ?column? 
----------
 t
(1 row)

SELECT '"-999999999"^^xsd:double'::rdfnode < '"-INF"^^xsd:double'::rdfnode; -- Returns f
 ?column? 
----------
 f
(1 row)