Re: [HACKERS] ERROR: operator does not exist: integer !=- integer
I get it. scan.l converts '!=' to '<>':
644 /* Convert "!=" operator to "<>" for
compatibility */
645 if (strcmp(yytext, "!=") == 0)
646 yylval.str = pstrdup("<>");
647 else
648 yylval.str = pstrdup(yytext);
""Joshua D. Drake"" <[EMAIL PROTECTED]>
>
> Well yes it will work if you add a space, but technically the problem is
> the query should be written like this:
>
> 1 <>-1 or 1 <> -1
>
> Joshua D. Drake
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Re: [HACKERS] ERROR: operator does not exist: integer !=- integer
I missed the first post and can't seem to search for it - so correct me if I am missing something. Isn't the problem here a missing space? != is a valid operator and -1 is the value you are comparing to. !=-1 is not valid but != -1 is correct and what I assume you are looking to achieve. Well yes it will work if you add a space, but technically the problem is the query should be written like this: 1 <>-1 or 1 <> -1 Joshua D. Drake The negation operator goes with the int being negated and is not part of the comparison operator != the space is needed there to separate the two. ---(end of broadcast)--- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
Re: [HACKERS] ERROR: operator does not exist: integer !=- integer
"William ZHANG" <[EMAIL PROTECTED]> writes: > backend> select -1 !=-1; > ERROR: operator does not exist: integer !=- integer at character 11 This is not a bug. regards, tom lane ---(end of broadcast)--- TIP 6: explain analyze is your friend
[HACKERS] ERROR: operator does not exist: integer !=- integer
Here is the steps to reproduce it in CVS HEAD:
$ uname -a
Linux os-server 2.6.9-11.19AX #1 Fri Aug 5 05:12:07 EDT 2005 i686 i686 i386
GNU/Linux
$ ./postgres --single -D $HOME/pgsql/data postgres
PostgreSQL stand-alone backend 8.3devel
backend> show server_version;
1: server_version (typeid = 25, len = -1, typmod = -1, byval =
f)
1: server_version = "8.3devel" (typeid = 25, len = -1, typmod = -1,
byval = f)
backend> select -1 != -1;
1: ?column?(typeid = 16, len = 1, typmod = -1, byval = t)
1: ?column? = "f" (typeid = 16, len = 1, typmod = -1, byval =
t)
backend> select -1 !=-1;
ERROR: operator does not exist: integer !=- integer at character 11
HINT: No operator matches the given name and argument type(s). You might
need to add explicit type casts.
STATEMENT: select -1 !=-1;
A quick hack in scan.l :
*** src/backend/parser/scan.l.old 2007-03-04 11:39:56.831289992 +0800
--- src/backend/parser/scan.l 2007-03-04 11:40:04.142178568 +0800
***
*** 605,610
--- 605,617
{
int ic;
+ /* filter out operaters end
with '=' */
+ if (yytext[nchars - 2] ==
'=')
+ {
+ nchars--;
+ continue;
+ }
+
for (ic = nchars-2; ic >= 0;
ic--)
{
if
(strchr("[EMAIL PROTECTED]&|`?%", yytext[ic]))
Now the result is correct:
backend> select -1 !=-1;
1: ?column?(typeid = 16, len = 1, typmod = -1, byval = t)
1: ?column? = "f" (typeid = 16, len = 1, typmod = -1, byval =
t)
--
Regards,
William ZHANG
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Re: [HACKERS] ERROR: operator does not exist: integer !=- integer
Andrew - Supernews wrote: On 2007-03-04, William ZHANG <[EMAIL PROTECTED]> wrote: Here is the steps to reproduce it in CVS HEAD: backend> select -1 !=-1; This arguably isn't a bug, because != is not a standard SQL operator, and therefore !=- can legitimately be defined as a single operator by the user. I missed the first post and can't seem to search for it - so correct me if I am missing something. Isn't the problem here a missing space? != is a valid operator and -1 is the value you are comparing to. !=-1 is not valid but != -1 is correct and what I assume you are looking to achieve. The negation operator goes with the int being negated and is not part of the comparison operator != the space is needed there to separate the two. -- Shane Ambler [EMAIL PROTECTED] Get Sheeky @ http://Sheeky.Biz ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [HACKERS] ERROR: operator does not exist: integer !=- integer
On 2007-03-04, William ZHANG <[EMAIL PROTECTED]> wrote: > Here is the steps to reproduce it in CVS HEAD: > backend> select -1 !=-1; This arguably isn't a bug, because != is not a standard SQL operator, and therefore !=- can legitimately be defined as a single operator by the user. -- Andrew, Supernews http://www.supernews.com - individual and corporate NNTP services ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
