[PATCH] Erase the distinctClause if the result is unique by definition

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От Andy Fan
Тема [PATCH] Erase the distinctClause if the result is unique by definition
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Msg-id CAKU4AWqZvSyxroHkbpiHSCEAY2C41dG7VWs=c188KKznSK_2Zg@mail.gmail.com
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Ответы Re: [PATCH] Erase the distinctClause if the result is unique by definition
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Hi:

I wrote a patch to erase the distinctClause if the result is unique by 
definition,  I find this because a user switch this code from oracle 
to PG and find the performance is bad due to this,  so I adapt pg for
this as well. 

This patch doesn't work for a well-written SQL,  but some drawback 
of a SQL may be not very obvious,  since the cost of checking is pretty
low as well,  so I think it would be ok to add.. 

Please see the patch for details.   

Thank you. 
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