subselect losing the index when where clause includes coalesce()
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Key: CORE-4640
URL: http://tracker.firebirdsql.org/browse/CORE-4640
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.2 Update 1
Environment: Win8.1, Firebird 2.5.2.26540 (x64)
Reporter: Omacht András
Attachments: FB_TEST.ZIP
See the attached database.
When running
select t3.id,
(select first 1 v1.id
from v1
where v1.vc1 = 'A' and v1.i2 = 1000 and v1.i1 = coalesce(t3.i1_1,
t3.i1_2))
from t3
no indicies were found for view v1:
Plan
PLAN (V1 T1 NATURAL)
PLAN (V1 T2 NATURAL)
PLAN (T3 NATURAL)
The engine should use T1_UK and T2_UK:
Plan
PLAN (V1 T1 INDEX (T1_UK1))
PLAN (V1 T2 INDEX (T2_UK1))
PLAN (T3 NATURAL)
Without coalesce in then where clause it works fine:
select t3.id,
(select first 1 v1.id
from v1
where v1.vc1 = 'A' and v1.i2 = 1000 and v1.i1 = t3.i1_1)
from t3
Plan
PLAN (V1 T1 INDEX (T1_UK1))
PLAN (V1 T2 INDEX (T2_UK1))
PLAN (T3 NATURAL)
and
select t3.id,
(select first 1 v1.id
from v1
where v1.vc1 = 'A' and v1.i2 = 1000 and v1.i1 = t3.i1_2)
from t3
Plan
PLAN (V1 T1 INDEX (T1_UK1))
PLAN (V1 T2 INDEX (T2_UK1))
PLAN (T3 NATURAL)
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