Re: "JPPD bypassed: DISTINCT clause" in 19c

Hi Nenad,

I can’t replicate on (windows) 19.7.0.1.200414, which RU are you on?

I just did explain plan for
Select distinct cols from tab_a join (select /*+no_merge*/distinct cols from tab_b) join on col_a where tab_a.col_b = :x

It took 5 seconds to return but I got a view pushed predicate. Without the no_merge, it just merges so nothing to push into.

Is my demo case similar enough to yours?

Thanks,
Andy

On Fri, 4 Sep 2020 at 11:20, Noveljic Nenad <nenad.noveljic_at_vontobel.com> wrote:

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> Has anybody else seen this in 19c: "JPPD bypassed: DISTINCT clause" ?
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> The optimizer doesn’t push a predicate into the DISTINCT view in 19.7
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> I’ve already applied
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> *30786641 : QUERY PERFORMANCE REGRESSION AFTER UPGRADING FROM 11.2.0.4 TO
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> Best regards,
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> Nenad
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> https://nenadnoveljic.com/blog
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