Tom Lane wrote:
>Dmitry Tkach <dmitry@openratings.com> writes:
>
>
>>I now have the same problem with it, but the other way around - the
>>query with a condition on a runs quickly, and one with a condition on b
>>does not... and the query plans are the same, and have a as outer table...
>>
>>
>
>Hm. You know, I wonder whether the query plans really are the same.
>One of the reasons why 7.3 and later show the qual conditions is that
>it was too easy to fall into the trap of assuming that plans of the same
>structure had the same conditions. Try doing "explain verbose" and look
>to see if the plans look the same at that level of detail.
>
> regards, tom lane
>
>
I am afraid that's too much detail for me to look at :-)
I have no clue what all that stuff means :-(
But I am pretty sure they are the same - I did not know whether the
first one or the second was supposed to be the outer relation, so I
looked at it in the debugger...
So, I know that in both cases it was using b for the outer loop...
Thanks!
Dima