should be it

external/duckdb/test/sql/function/numeric/test_nextafter.test

@@ -0,0 +1,89 @@
+# name: test/sql/function/numeric/test_nextafter.test
+# description: Next After test
+# group: [numeric]
+
+statement error
+select nextafter()
+----
+
+statement error
+select nextafter('bla','bla')
+----
+
+query I
+select nextafter(NULL,1)
+----
+NULL
+
+query I
+select nextafter(1,NULL)
+----
+NULL
+
+query I
+select nextafter(99, 1)
+----
+99
+
+query R
+select nextafter(99.0::DOUBLE, 1.0::DOUBLE) < 99
+----
+True
+
+query R
+select nextafter(99.0::DOUBLE, 99.0::DOUBLE) = 99
+----
+True
+
+query R
+select nextafter(99.0::DOUBLE, 100.0::DOUBLE) > 99
+----
+True
+
+query R
+select nextafter(nextafter(99.0::DOUBLE, 100.0::DOUBLE),0::DOUBLE)  = 99
+----
+True
+
+query R
+select nextafter(99.0::FLOAT, 1.0::FLOAT) < 99
+----
+True
+
+query R
+select nextafter(99.0::FLOAT, 100.0::FLOAT) > 99
+----
+True
+
+query R
+select nextafter(nextafter(99.0::FLOAT, 100.0::FLOAT),0::FLOAT)  = 99
+----
+True
+
+statement ok
+create table test (a FLOAT)
+
+statement ok
+INSERT INTO test VALUES (10),(20),(30),(40)
+
+query R
+select nextafter(a, 0::FLOAT) from test
+----
+9.999999
+19.999998
+29.999998
+39.999996
+
+statement ok
+create table test_twoc (a FLOAT, b FLOAT)
+
+statement ok
+INSERT INTO test_twoc VALUES (10,1),(20,21),(30,1),(40,41)
+
+query R
+select nextafter(a, b) from test_twoc
+----
+9.999999
+20.000002
+29.999998
+40.000004