EO inheritance + Oracle
EO inheritance + Oracle
- Subject: EO inheritance + Oracle
- From: Jon Nolan <email@hidden>
- Date: Tue, 22 Mar 2011 17:31:42 -0600
- Organization: Loch Garman
I have a fairly involved EO inheritance tree that works beautifully in every way but one. Here's a quick example illustrating the structure I'm using:
Human
North American
American
Canadian
Mexican
European
German
Italian
Spaniard
Asian
Korean
Laotian
etc. You get the idea.
So if I utilize European.fetchEuropeans(...) a qualifier is generated along the lines of HUMAN_TYPE = German or HUMAN_TYPE = Italian or HUMAN_TYPE = Spaniard. This would be fine except for the Oracle optimizer deciding not to use the HUMAN_TYPE_IDX index. I've tried using hints but (a) it's difficult to get right for a query generated by a ERXBatchingDisplayGroup and (b) the JDBC adaptor disconnects me when I try.
There is another qualifier clause which happens to make it so that, in the European example, all the returned humans will indeed be German, Italian or Spaniard. Is there any way to simply discard the OR'd HUMAN_TYPE qualifier? Any other suggestions? Do I have something wrong in my model in the first place?
Thanks,
Jon
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