Bad optimization of quiries with OR predicate to view with union
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Key: CORE-4102
URL: http://tracker.firebirdsql.org/browse/CORE-4102
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.2, 2.1.5
Reporter: GR
Script to reproduce:
CREATE TABLE TEST_TABLE (ID INTEGER);
CREATE INDEX IDX1 ON TEST_TABLE (ID);
CREATE VIEW TEST_VIEW
AS
SELECT ID FROM TEST_TABLE
UNION ALL
SELECT ID FROM TEST_TABLE ;
===============================================
Queries with plans:
SELECT *
FROM TEST_TABLE
WHERE (ID = 0) OR (ID = 1)
Plan
PLAN (TEST_TABLE INDEX (IDX1, IDX1))
----------------------------------------
SELECT * FROM TEST_VIEW
WHERE (ID = 0)
Plan
PLAN (TEST_VIEW TEST_TABLE INDEX (IDX1))
PLAN (TEST_VIEW TEST_TABLE INDEX (IDX1))
----------------------------------------
SELECT * FROM TEST_VIEW
WHERE (ID = 0) OR (ID = 1)
Plan
PLAN (TEST_VIEW TEST_TABLE NATURAL)
PLAN (TEST_VIEW TEST_TABLE NATURAL)
while expected
Plan
PLAN (TEST_VIEW TEST_TABLE INDEX (IDX1, IDX1))
PLAN (TEST_VIEW TEST_TABLE INDEX (IDX1, IDX1))
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