A mistake generates strange result

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Sorry to post this to the entire list, but it your messages don't
have unsubscription info at the bottom, and the person who subscribed
(ckhui@school.net) isn't a valid user here (I am the postmaster).

-Joel Henderson
postmaster@school.net

I have a parallel inheritance going on,
so I was wondering if there was a way
to re-name a derived column? This would
make my design clearer.
-----------------

CREATE TABLE B
( NAME VARCHAR(10) );

CREATE TABLE C
( ... ) INHERITS(B);

CREATE TABLE X
(
A VARCHAR(10),
B VARCHAR(10),
CONSTRAINT FOREIGN KEY (B) REFERENCES B(OID)
);

CREATE TABLE Y
( B AS C, /* Syntatic Sugar */
D VARCHAR(10),
CONSTRAINT FOREIGN KEY (C) REFERENCES C(OID)
) INHERITS(X)

Here, I've added the syntax "AS" to show that
column A in table X, is called B in the
derived table Y.

Thank you for your thoughts.

:) Clark Evans

Hi !

"Ricardo J.C.Coelho" <pulsar@truenet-ce.com.br> writes:

Just for PgSQL's development group think about....
I made a mistake typing a query that generates a strange result
(Very strange).

The query: select text('12345678'::float8);
It returns a date in datetime format !!!!!!

I didn't found any function of name "text" that converts
float8 to text. So I think Postgres made an implicit cast of the data
to datatime. So: String->Float8->DateTime->Text. Stranger : I didn't
found any function to cinvert float to text !

If you use: select ('12345678'::float8)::text; everything runs well.

Here, you made an explicit cast, without the use of any
function. So your data is casted well.

Hope this helps !

Unfortunately, that is true, at least for Postgres 6.4.0:
template1=> select text('12345678'::float8);

text
-----------------------------
Tue May 23 00:21:18 2000 EEST
(1 row)

Please, guys, take care of this small bug:-)
Aleksey

On 9 Feb 1999, [ISO-8859-1] St���phane Dupille wrote:

The query: select text('12345678'::float8);
It returns a date in datetime format !!!!!!

Yup, I see it here also with 6.4.2.

The current development sources seem OK however:

regression=> select text('12345678'::float8);
text
--------
12345678
(1 row)

So it should be fixed in 6.5. (Thomas, could this be back-patched
into 6.4.3?)

regards, tom lane

Unfortunately, that is true, at least for Postgres 6.4.0:
template1=> select text('12345678'::float8);

text
-----------------------------
Tue May 23 00:21:18 2000 EEST
(1 row)

Please, guys, take care of this small bug:-)
Aleksey

Works in the current tree:

test=> select text('12345678'::float8);
text
--------
12345678
(1 row)

test=>

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Unfortunately, that is true, at least for Postgres 6.4.0:
template1=> select text('12345678'::float8);
-----------------------------
Tue May 23 00:21:18 2000 EEST
Please, guys, take care of this small bug:-)

tgl=> select text('12345678'::float8);
text
--------
12345678
(1 row)

Already done. From the cvs log:

revision 1.84
date: 1998/11/17 14:36:51; author: thomas; state: Exp; lines: +34 -15
Add text<->float8 and text<->float4 conversion functions.
This will fix the problem reported by Jose' Soares
when trying to cast a float to text.

- Tom

So it should be fixed in 6.5. (Thomas, could this be back-patched
into 6.4.3?)

Not likely, since it defined a couple of new procedures in the system
tables to do explicit string to float8 conversions.

The only v6.4.3-compatible patch we can make is to remove the "binary
equivalence" between datetime and float8, which I had put in to allow
more date arithmetic (a lazy solution, but it seemed a good idea at the
time :/ I have a patch to do that, but have not applied it to either
tree yet.

- Tom

St�phane Dupille ha scritto:

Hi !

"Ricardo J.C.Coelho" <pulsar@truenet-ce.com.br> writes:

Just for PgSQL's development group think about....
I made a mistake typing a query that generates a strange result
(Very strange).

The query: select text('12345678'::float8);
It returns a date in datetime format !!!!!!

I didn't found any function of name "text" that converts
float8 to text. So I think Postgres made an implicit cast of the data
to datatime. So: String->Float8->DateTime->Text. Stranger : I didn't
found any function to cinvert float to text !

If you use: select ('12345678'::float8)::text; everything runs well.

Here, you made an explicit cast, without the use of any
function. So your data is casted well.

Hope this helps !

This seems like a bug, because there's no a text(float8) built-in function.

hygea=> select text('12345678'::float8);
text
----------------------
2000-05-22 23:21:18+02

but if you create the function like:

create function text(float8) returns text as
'
begin
return $1;
end;
' language 'plpgsql';
CREATE

select text('12345678.2'::float8);
text
----------
12345678.2
(1 row)

- Jose' -

And behold, I tell you these things that ye may learn wisdom; that ye may
learn that when ye are in the service of your fellow beings ye are only
in the service of your God. - Mosiah 2:17 -