Details
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Type:
Bug
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Status: Closed
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: 1.0.3, 1.2.1, 2.0.0-M2, 2.0.0-M3
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Fix Version/s: 1.0.4, 1.2.2, 1.3.0, 2.0.0-beta
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Component/s: sql
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Labels:None
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Environment:DB2
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Patch Info:Patch Available
Description
Using DB2, when a user uses the UPPER or LOWER function, the field is automatically CAST to a varchar. It would be nice if OpenJPA were a little smarter and only used CAST when necessary. Using the CAST causes any indexes not to be used so performance won't be what it should.
I saw some other DB2 functions that also are always CAST, so we may need to improve these also.
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Replacing old patches with new ones...Slightly better
new patches include all changes from code review
Thanks for the patches, BJ. The fix is in the latest SNAPSHOT builds.
Attached patches to be considered for inclusion to OpenJPA. No real differences in the patches except that the 1.0.x patch includes a new test case that wasn't already present in 1.0.x (the other 2 just modify the existing test case).
For the most part, the change is that when UPPER or LOWER are used, DB2Dictionary looks to see what the database column is defined as before doing the cast. In this way, if the column is already a VARCHAR, then indexes would still be used since no cast would be generated.