Re: Bug in documentation: https://www.postgresql.org/docs/current/spi-examples.html

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От David G. Johnston
Тема Re: Bug in documentation: https://www.postgresql.org/docs/current/spi-examples.html
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Msg-id CAKFQuwZjEOJR8i7OLaxLxUCBR4aRU2PL_Xg1UFbUUkmPGxz73Q@mail.gmail.com
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Ответ на Re: Bug in documentation: https://www.postgresql.org/docs/current/spi-examples.html  (Curt Kolovson <ckolovson@gmail.com>)
Ответы Re: Bug in documentation: https://www.postgresql.org/docs/current/spi-examples.html  (Tom Lane <tgl@sss.pgh.pa.us>)
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On Mon, Jul 17, 2023 at 7:45 PM Curt Kolovson <ckolovson@gmail.com> wrote:
I’d vote for showing both (with RETURNING and without), since without it the second argument to SPI_exec has no effect in this example, which may not be obvious. That seems to be one of the subtle points illustrated by this example.

I concur:

=> SELECT execq('CREATE TABLE a (x integer)', 0); // start at 0
=> INSERT INTO a VALUES (execq('INSERT INTO a VALUES (0)', 0)); // insert 2
=> SELECT execq('SELECT * FROM a', 0);

+ => SELECT execq('INSERT INTO a SELECT x + 2 FROM a returning x', 1); -- one more 
+ -- (IIUC non-deterministically regardless of observed behavior even if there were a limit in the SELECT)

=> SELECT execq('INSERT INTO a SELECT x + 2 FROM a', 1); // three more
=> SELECT execq('SELECT * FROM a', 10); // 6 as 10 is a limit

...[next block]
David J.

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