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("~!@#^&|`?%", 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
On 2007-03-04, William ZHANG <uniware@zedware.org> 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
Andrew - Supernews wrote:
On 2007-03-04, William ZHANG <uniware@zedware.org> 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
pgSQL@Sheeky.Biz
Get Sheeky @ http://Sheeky.Biz
"William ZHANG" <uniware@zedware.org> writes:
backend> select -1 !=-1;
ERROR: operator does not exist: integer !=- integer at character 11
This is not a bug.
regards, tom lane
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
Show quoted text
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.
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"" <jd@commandprompt.com>
Show quoted text
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