> > error message in log:
> > ERROR:  invalid restriction selectivity: 0.000049
>
> [ blink... ]  Surely it didn't really say that, because a moment's
> glance at the code shows that it's impossible:
>
>       if (result < 0.0 || result > 1.0)
>               elog(ERROR, "invalid restriction selectivity: %f", result);
>
> If it really did say that, then you have either seriously flaky hardware
> or a broken compiler.  In either case, us mere database weenies can't
> help much.
>
>                       regards, tom lane

Really, it seems that is hardware trouble, beacause it works on virtual 
machine (KVM), which is buggy enough :( 
Thanks.

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