Add a test tests/functional/arno/optimizer/test_opt_single_index_selection_04.py from fbtest.

tests/functional/arno/optimizer/test_opt_single_index_selection_04.py

@@ -0,0 +1,91 @@
+#coding:utf-8
+
+"""
+ID:          optimizer.single-index-selection-04
+TITLE:       Best match index selection (single segment)
+DESCRIPTION:
+    Check if it will select the indexes which can be used.
+    Index selectivity difference factor 20 and 200.
+    (Indexes with selectivity more than 10x the best are ignored)
+    See SELECTIVITY_THRESHOLD_FACTOR in opt.cpp
+
+    selectivity = (1 / (count - duplicates));
+
+    best = 0.001
+    999 / 20 = 49, 0..49 = 50 different values, = 0.02
+    999 / 200 = 4, 0..4 = 5 different values, = 0.2
+FBTEST:      functional.arno.optimizer.opt_single_index_selection_04
+"""
+
+import pytest
+from firebird.qa import *
+
+init_script = """CREATE TABLE SelectionTest (
+  F1 INTEGER NOT NULL,
+  F2 INTEGER NOT NULL,
+  F3 INTEGER NOT NULL
+);
+
+SET TERM ^^ ;
+CREATE PROCEDURE PR_SelectionTest
+AS
+DECLARE VARIABLE FillID INTEGER;
+BEGIN
+  FillID = 1;
+  WHILE (FillID <= 999) DO
+  BEGIN
+    INSERT INTO SelectionTest
+      (F1, F2, F3)
+    VALUES
+      (:FILLID,
+       (:FILLID / 20) * 20,
+       (:FILLID / 200) * 200);
+    FillID = FillID + 1;
+  END
+END
+^^
+SET TERM ; ^^
+
+COMMIT;
+
+/* Fill table with data */
+EXECUTE PROCEDURE PR_SelectionTest;
+
+COMMIT;
+
+/* Create indexes */
+CREATE ASC INDEX I_F1_ASC ON SelectionTest (F1);
+CREATE ASC INDEX I_F2_ASC ON SelectionTest (F2);
+CREATE ASC INDEX I_F3_ASC ON SelectionTest (F3);
+
+COMMIT;
+"""
+
+db = db_factory(init=init_script)
+
+test_script = """SET PLAN ON;
+SELECT
+  st.F1, st.F2, st.F3
+FROM
+  SelectionTest st
+WHERE
+  st.F1 = 200 and
+  st.F2 = 200 and
+  st.F3 = 200;
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """PLAN (ST INDEX (I_F1_ASC))
+
+          F1           F2           F3
+============ ============ ============
+
+         200          200          200
+"""
+
+@pytest.mark.version('>=3.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute()
+    assert act.clean_stdout == act.clean_expected_stdout