| From: | Peifeng Qiu <pgsql(at)qiupf(dot)dev> |
|---|---|
| To: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
| Cc: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Optimize common expressions in projection evaluation |
| Date: | 2022-12-05 08:51:49 |
| Message-ID: | CAPH51beXAKCtdP1BTsU+HiQ6WDV25WqkYZ_sS5HBA-gJ4iBRPw@mail.gmail.com |
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| Lists: | pgsql-hackers |
> Which is properly written as the following, using lateral, which also avoids the problem you describe:
>
> INSERT INTO tbl
> SELECT func_call.*
> FROM ft
> JOIN LATERAL convert_func(ft.rawdata) AS func_call ON true;
I didn't fully realize this syntax until you point out. Just try it out in
our case and this works well. I think My problem is mostly resolved
without the need of this patch. Thanks!
It's still good to do something about the normal (func(v)).* syntax
if it's still considered legal. I will give a try to expanding it more
cleverly and see if we can avoid the duplicate evaluation issue.
Peifeng Qiu
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