Handle pushing IN predicates into UNIONs. This would allow use of index if
present improving performance.
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Key: DERBY-772
URL: http://issues.apache.org/jira/browse/DERBY-772
Project: Derby
Type: Sub-task
Components: SQL
Versions: 10.0.2.0, 10.1.2.1, 10.2.0.0
Environment: generic
Reporter: Satheesh Bandaram
Fix For: 10.2.0.0, 10.1.2.2
While fix for DERBY-649 allows pushing binary predicates into SELECT statements
that are underneath a UNOIN, it would also be good to allow IN operations to be
pushed. Derby can rewrite IN operations in a way to allow use of index, if
present.
Derby currently rewrites: REF IN (1, 2, 3) to REF >=1 and REF <=3 and hence
would allow use of index on REF, if present. Pushing this predicate into Union
would allow use of index on REF for queries like:
Select * from
(SELECT REF, NAME from T1 UNION ALL SELECT REF, NAME from t2)
where REF IN (1,2,3)
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