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Re: EOAndQualifier order
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Re: EOAndQualifier order


  • Subject: Re: EOAndQualifier order
  • From: Q <email@hidden>
  • Date: Thu, 12 Jul 2007 10:08:36 +1000


On 12/07/2007, at 7:29 AM, Miguel Arroz wrote:

Hi!

I'm looking and the generated SQL from an EOAndQualifier, and it looks like the order of the "anded" stuff is the inverse one I write on the code. If I write a qualifier like "bananas = %@ and apples = %@ and oranges = %@", the generated SQL will be the reverse (t0.oranges = (...) AND t0.apples = (...) AND to.bananas = (...)".

Is this normal? Is the order random? What's happening here? I'm asking this, because from what I understand form the PostgreSQL docs, the order of the stuff in ANDs (and ORs) may have cause a really big difference in performance when indexes (and multi- indexes) are envolved.

Where exactly did you read this? Order of the conditional expressions shouldn't make any difference to the query planner.


--
Seeya...Q

Quinton Dolan - email@hidden
Gold Coast, QLD, Australia (GMT+10)
Ph: +61 419 729 806



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  • Follow-Ups:
    • Re: EOAndQualifier order
      • From: Guido Neitzer <email@hidden>
    • Re: EOAndQualifier order
      • From: Miguel Arroz <email@hidden>
    • Re: EOAndQualifier order
      • From: Sam Barnum <email@hidden>
References: 
 >EOAndQualifier order (From: Miguel Arroz <email@hidden>)

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