Added/Updated tests\functional\sqlancer\doi_10_1145_3428279_example_02_test.py: adapted from article provided in SQLancer documentation.

Author: pavel-zotov

tests/functional/sqlancer/doi_10_1145_3428279_example_02_test.py

@@ -0,0 +1,53 @@
+#coding:utf-8
+
+"""
+ID:          n/a
+ISSUE:       https://dl.acm.org/doi/pdf/10.1145/3428279
+TITLE:       Wrong result of UNION DISTINCT
+DESCRIPTION:
+    Manuel Rigger and Zhendong Su
+    Finding Bugs in Database Systems via Query Partitioning
+    https://dl.acm.org/doi/pdf/10.1145/3428279
+    page 10 listing 2
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = """
+    set list on;
+    recreate view v0 as select 1 x from rdb$database;
+    recreate table t0 ( c0 int );
+    recreate view v0 as select cast ( t0.c0 as integer ) as c0 from t0;
+
+    insert into t0 ( c0 ) values (0);
+
+    set count on;
+
+    select distinct t0.c0 as q1_table_c0, v0.c0 as q1_view_c0
+    from t0 left outer join v0 on v0.c0 >= '0'; -- expected = found = {0|0}
+
+    select t0.c0 as q2_table_c0, v0.c0 as q2_view_c0 from t0 left outer join v0 on v0.c0 >= '0' where true
+    union
+    select * from t0 left join v0 on v0.c0 >= '0' where not true
+    union
+    select * from t0 left join v0 on v0.c0 >= '0' where true is null ; -- expected: {0|0}, found: {0|null}
+"""
+
+act = isql_act('db', test_script, substitutions=[('[ \t]+', ' ')])
+
+@pytest.mark.version('>=3.0')
+def test_1(act: Action):
+    act.expected_stdout = """
+        Q1_TABLE_C0  0
+        Q1_VIEW_C0   0
+        Records affected: 1
+
+        Q2_TABLE_C0  0
+        Q2_VIEW_C0   0
+        Records affected: 1
+    """
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout