Search Postgresql Archives

回复: I added a √ operator, the sqrt function is still used internally, but now there is a problem, it affects the := and .. operators of the database

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello, I think what you said is right, it should be the problem. But I don't know what to do in the lexical analysis system of plpgsql to solve this problem.


------------------ 原始邮件 ------------------
发件人: "Tom Lane" <tgl@xxxxxxxxxxxxx>;
发送时间: 2021年11月12日(星期五) 中午1:42
收件人: "孤傲小二~阿沐"<2903807914@xxxxxx>;
抄送: "pgsql-general"<pgsql-general@xxxxxxxxxxxxxxxxxxxx>;
主题: Re: I added a √ operator, the sqrt function is still used internally, but now there is a problem, it affects the := and .. operators of the database

"=?gb18030?B?ucKwwdChtv6hq7Ci4+U=?=" <2903807914@xxxxxx> writes:
> # Description of Requirement:
> 1¡¢select ¡Ì num1; function
> 2¡¢The value of num1 is required to be: [0,9223372036854775807]
> 3¡¢¡Ì The operation does not allow decimals

Looks suspiciously like a homework assignment.

> I have now developed this feature on the PostgreSQL 14.0 kernel! But it affects the original function of the database:
> #&nbsp;Affected place
> 1¡¢ := assignment operator
> 2¡¢ Operator in 1..10

Today's lesson is: read the comments on the code you're modifying.
Notably on gram.y's list of "non keyword" tokens:

 * Non-keyword token types.  These are hard-wired into the "flex" lexer.
 * They must be listed first so that their numeric codes do not depend on
 * the set of keywords.  PL/pgSQL depends on this so that it can share the
 * same lexer.  If you add/change tokens here, fix PL/pgSQL to match!

Since you didn't do that, PL/pgSQL is confused about the token codes
in use for DOT_DOT and so on.

regards, tom lane

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]

  Powered by Linux