Added/Updated tests\functional\sqlancer\osdi20_rigger_example_01_test.py: adapted from article provided in SQLancer documentation.

Author: pavel-zotov

tests/functional/sqlancer/osdi20_rigger_example_01_test.py

@@ -0,0 +1,40 @@
+#coding:utf-8
+
+"""
+ID:          n/a
+ISSUE:       https://www.usenix.org/system/files/osdi20-rigger.pdf
+TITLE:       Partial index must not use incorrect assumption that 'c0 IS NOT 1' implied 'c0 NOT NULL'
+DESCRIPTION:
+    https://www.usenix.org/system/files/osdi20-rigger.pdf
+    page 3 listing 1
+NOTES:
+    [05.06.2025] pzotov
+    Support for partial indices in FB:
+    https://github.com/FirebirdSQL/firebird/pull/7257
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = """
+    set list on;
+    recreate table t0 ( c0 int );
+    create index i0 on t0 (c0) where c0 is not null;
+    insert into t0 values (0);
+    insert into t0 values (1);
+    insert into t0 values (null);
+    select c0 from t0 where c0 is distinct from 1;
+"""
+
+act = isql_act('db', test_script, substitutions=[('[ \t]+', ' ')])
+
+@pytest.mark.version('>=5.0')
+def test_1(act: Action):
+    act.expected_stdout = """
+        C0 0
+        C0 <null>
+    """
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout