Hi Alexey,
1. See internal sqlite instarray interface:
http://sqlite.mobigroup.ru/src/finfo?name=src/test_intarray.c
http://sqlite.mobigroup.ru/src/finfo?name=src/test_intarray.h
http://sqlite.mobigroup.ru/src/finfo?name=test/intarray.test
Note: http://sqlite.mobigroup.ru include official
I'm trying to determine if a Range(from, to) function can be made as an
extension function.
Its effect would be to expand, for instance, range(1, 5) into (1, 2, 3,
4, 5) for use in constructs similar to
select some_scalar_function(i) where i in range(1, 5);
without having to build a
Why not just
select some_scalar_function(i) where i between 1 and 5;
That's because we then get
No such column: i.
That was not very important. I would have the use for such possibility
but I can live without. My question was just curiosity about whether
something along the line could
Ah. You want table-valued functions, like this:
http://msdn.microsoft.com/en-us/library/ms191165.aspx
Thanks Igor, that's what I had in mind.
In any case, SQLite doesn't support table-valued functions. The
closest thing to it is a virtual table:
OK, got it, but this is a bit of heavy engine
ATTACH DATABASE ?1 as sysDB
AFAIK you can't use parameter binding for anything else than litteral
values.
It makes sense since it would be impossible for the parser and
optimizer to evaluate and produce run-time code for a statement without
knowing beforehand which database or column the
Wouldn't it make more sense for i in 1..5 to expand to i = 1 and i
= 5?
Then it would also work for ordered types that aren't ordinal, such as
rationals
and strings and blobs and dates etc, and it would work for very large
ranges,
since there's no conceptual need to generate all the
sqlite select * from test where text like '_';
Underscore '_' is LIKE wildcard for any single character, percent '%'
matches any substring.
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SELECT count(*) WHERE NOT text IS NULL
requires that the complete text column is loaded. With a stored LOB
this results in crazy performance.
How did you find that? What do you mean by requires loading of the
whole text column? It pretty much can require even loading of text
columns that
I totally disagree with you. Let's say you have 1,000,000 rows and 100
of them contain NULL. In this situation selecting NOT NULL will select
almost all rows which means that using index in this case doesn't give
any performance boost. So here using full scan for NOT NULL condition
is better and
maybe NOT is implemented the same way as any other
function and so it cannot be optimized using index.
That's possible, but other logical operators don't exhibit the same
bahavior and will not prevent the use of indexes. That NOT is not
being handled at the same _logical_ level than AND and
So indexes are not used for NOT conditions, as NOT conditions
generally require a full scan, regardless. Yes, it is a simple
reverse of a binary test, but the reverse of a specific indexed
lookup of a known value is a table scan to gather all the unknown
values.
Jay,
I
NULL = 12345 is NULL, NOT NULL is NULL, so subset N is not part of NOT
(col = 12345).
You're right of course! (and I was even saying about nulls treated apart)
But, in your view, that the set can be non-contiguous for
negative/negated conditions would it explain that current code can't
make
I haven't been able to think of how it would preclude using the index,
but I suspect it's more a matter of needing a similar-but-different
codepath to optimize for the NOT case, rather than a simple invert
this codepath relying on the existing case. Which is really just
another way of stating
It is driving me crazy. I'm working on a web spider where a table
holds the downloaded
webpage. It seems that a select
SELECT count(*) WHERE NOT text IS NULL
requires that the complete text column is loaded. With a stored LOB
this results in crazy performance.
Is this optimized in later
The diagrams in the following pages of the documentation don't allow
for the ROLLBACK TO construct: lang_savepoint.html and
lang_transaction.html
lang_savepoint.html also contains a 'tranaction' typo.
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Forget the previous post as it's probably wrong. I was misinterpreting
the ROLLBACK TO discussion. In fact I was led to believe there were
two forms: rollback to and rollback to savepoint. This is not
the case.
But then, I still have hard time understanding this part:
Instead of cancelling
It doesn't matter if you are in a transaction or not, changing
rows while inside a fetch loop on the same table may lead
to problems.
Sorry I was talking of another process doing asynchronous writes. I
didn't understand the warning was towards a single rogue process.
Of course letting the
The only thing that can bite you is if
you are in process of fetching rows from some select statement and you
update row that was just fetched or update/insert rows that would have
been fetched later by the select statement.
As I understand it, simply wrapping every batch operation (Read, Write
Be aware that the backup process will need to restart from zero after
each write!
Now, if you can setup some kind of IPC between your two processes, then
you could have the update process update the disk base and send
identical data to the reader process, so the latter can update a memory
I will try to do something to that extent using timer and character
counter.
I hoped that I could update the text stored in the database character
by character as fast as they come from the keyboard driver.
Unfortunately updates noticeably slow down the display of typed
characters.
You can
To to get columns that begin with a number range or any number, I
would use
in SQL server:
SELECT * FROM mytable WHERE myfield LIKE '[0-9]%'
This obviously doesn't work in sqlite and I have been searching for an
equivalence.
Try this:
SELECT * FROM mytable WHERE myfield glob '[0-9]*'
when Database tries to create tables, getting the below error:
table insert failed for eventLog any idea what is the reason, also I
have
these errors when I run manually, I gets these:
Uh! To help you in an efficient manner, it's obvious we absolutely
need an octal core dump of your 163
The execution time of the first time I run my query varies wildly, I
dunno why.
Probably due to an empty or dirty cache. That's fairly common with
cache inclined applications, subsystems or OSes. The second time, most
of what's needed is found in cache with much less variability.
The porter stemmer, by its very nature, is not intended to work for
non-english text
You should read the Snowball site about this: http://snowball.tartarus.org/
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Hi Tim,
I am also somewhat in the dark about concurrency issues (if any) in a
webservice scenario:
-- Do TEMP tables have database-connection-scope so that there is no
need to name the TEMP table uniquely? Does the table get deleted
automatically when the connection is closed if the
Hello Simon,
This has the advantage of removing the chance of a name-space collision.
That's true as well: it is an added free bonus. But honestly I would
say that for such transient usage a random generated name is fairly
unlikely to cause real-world problem.
select hex(randomblob(16));
Welcome to the SQLite list.
Can I add a column name containing a dash - and if yes, how would I
do that?
Make this
create table test([column-1] varchar(255));
or
create table test(column-1 varchar(255));
Both work
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No, it fails because 20 != '20'
And also possibly because
Date LIKE 2009%
should be
Date LIKE '2009%'
everywhere it appears.
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Hi Dan,
I've finally implemented the backup API and it works like a charm
except on an important point.
The example given on the site clearly says:
If another thread writes to database connection pDb while this
function is sleeping, then the backup database (database connection
I'm having trouble sorting the following data:
point_number - VARCHAR(10)
I've developped an SQLite extension including a very similar collation:
it sorts the (integral) prefix first and, in case of a draw, orders
based on the Unicode suffix.
It currently doesn't cope with floating-point
I've finally implemented the backup API and it works like a charm
except on an important point.
The example given on the site clearly says:
If another thread writes to database connection pDb while this
function is sleeping, then the backup database (database connection
pFile) is
Hi Robert,
For example, if I could store a graph in a sqlite database, I'd like
to query the database to know if the graph contains a Eulerian
path[1].
I may be driven by a misleading uneducated impression, but given the
nature of most graph-related algorithms --I see the search for Eulerian
Hi,
I am trying to migrate to Sqlite3.6.21. I visited the Sqlite site and
downloaded the compiled file. I'm surprised in verifying that the zip
only had the executable. I hoped to find also the DLL.
I bet you downloaded this: http://www.sqlite.org/sqlite-3_6_21.zip
This is the CLI, he
create table cities
(
id integer primary key not null,
name text not null
);
create table people
(
id integer primary key not null,
name text not null,
cities_id integer not null,
foreign key(cities_id) references cities(id)
);
insert into cities(name) values('Campos');
insert into cities(name)
I am inserting data into asset table as m/d/ HH:MM:SS t format
Ex: INSERT INTO ASSET (WARRANTSTDATE) VALUES ('12/22/2009 12:01:00 AM')
Ex: INSERT INTO ASSET (WARRANTSTDATE) VALUES ('9/22/2009 12:01:00 AM')
but my select query failed : No record found
Not surprising: you made it very
Hi,
At 00:11 13/12/2009, you wrote:
Sir any ida how can value rounddown floor have done
if not possible i have make small code
i requard make function please say how can add
i send you my rounddown funtion
please
Cose Exmaple :
value=10.666
decimal=1
Create roundd{value,decimal){
if
[ I apologize if this appears twice on the list ]
Hi,
At 00:11 13/12/2009, you wrote:
Sir any ida how can value rounddown floor have done
if not possible i have make small code
i requard make function please say how can add
i send you my rounddown funtion
please
Cose Exmaple :
I believe there is a bug here.
Yes, in I my own head!
We simply need to take care of integral values.
The correct rounding down at 3rd decimal places using SQLite can
be done so:
case
when cast(myValue as text) round(myValue) then
round(myValue - 0.0005, 3)
else
Something like (one line, wrapped by email):
echo INSERT INTO t1 (id,pic) VALUES (1,X'$(od -A n -t x1
picture.gif | tr -d '\r\n\t\ ')') | sqlite3 mydb
(The od utility may be smarter than that, optimization left
to the OP)
Looks good, you know better than I do. Just checked: od and tr are
Ted,
Is it the command-line program misinterpreting the CR/LFs?
Unfortunately, any command-line tool will interpret control characters
at their face value when they are fed directly.
With no ad hoc program doing it for you, the solution, as I've
discussed at length before and even if it is
hi , im using sqlite3 in debain
i want to check the first character should not be an special character.
[by before insert trigger]
how to do it?
i thought of using ascii function but i didnt find in sqlite.
No such function is part of the SQLite core. But I wrote an extension
offering that
What is programatically
How, in any meaningful way, is this different than running a shell
command (program of an extremely brief size)?
I took the OP's phrasing to mean that he needed a way to do it with
e.g. command-line available programs, but in any case without having to
use a
Hi Puneet,
Yes, that seems like a reasonable interpretation of the OP's question,
one I also understood. One thing I don't understand though,
Jean-Christophe, even though one can enter base64 encoded images
into the db via the sqlite shell, how does one create the base64
encoded images? One would
Could you please give me a step by step on how to do that? Not via a
small program written in a programming language, but only via the
sqlite3 shell, as both you and I agree that was the implied intent of
the OP's question.
Sorry, I'm no vxWorks, Unix, Linux, MacOS, Windows, AS400, Symbian,
I'm certainly not a SQlite guru, but
sqlite select * from sqlite_master where name = 'dly04';
table|dly04|dly04|1042384|CREATE TABLE dly04(i_stnid integer,
national_identifier varchar2(7),
local_year integer, local_month integer, local_day integer, etc, etc
I then imported data from work
From what I read, it is necessary to have a programmatic interface to
put images into a database. True?
yes, but I am not sure what other kind of interface there could be?
You can't imagine putting an image into a sqlite db through the
command line shell application. Of course, you can
You are correct. You proved that it is possible.
part 2: What are the usual and convenient ways of inserting images
into a sqlite db? answer: Programmatically.
I certainly don't dispute this, and I added to this effect:
It may not be the prefered way in most application, but it's
Gidday Tim,
I will look further into this approach:
select sqlite3_load_extension('mylibrary', 'entrypoint');
to see if Adobe's security permits it. However, the Adobe FlashBuilder
database application developer must confront this uncertainty: Adobe has
been unresponsive to questions about
PRAGMA set case_sensitive_like =1
This should be:
PRAGMA case_sensitive_like = 1
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Last minute comments on the pending release of SQLite 3.6.21 are
welcomed.
Thank you for your continued efforts.
Can you consider making sqlite3_auto_extension and
sqlite3_reset_auto_extension available into the API structure so that
they can both be invoked from within an extension without
Hi Tim,
... where myTextColumnUsingDefaultBinaryCollation like 'foo%'
Did you try
... where myTextColumnUsingDefaultBinaryCollation glob 'foo*'
GLOB is hardcoded as case-sensitive and more likely a candidate to
using index. Just check it.
2. In Adobe, one is not able to load a
Now I want to make query on employee table which gives the result having
names start between 'D' and 'M', so probable I'll do something SELECT *
FROM employee WHERE name BETWEEN 'd%' AND 'n%' . But this is very
specific
if I know the characters. I want to avoid using the character and use
Hi Igor,
The blob (x'41' is a blob literal) is expected to contain a UTF-8
sequence, I believe.
That means the user enters the hex UTF-8 (or 16 depending on base
encoding) representation of the character. E.g.:
select cast(x'c389' as text);
É
Something like:
select chrw(x'c9');
When the argument to sqlite3_value_type() is either a litteral or a
result of some scalar function, can we rely on testing for the 5
datatypes reliably?
I understand that when the argument comes from a column, then the type
returned by sqlite3_value_type() is the column type. But litterals
So, for example, if one wanted to find all rows where myNormalColumn
ENDS WITH 'fi c d', one could search myFlippedColumn like this:
select * from LEXICON where myFlippedColumn LIKE 'd c if%' --
allows index use
Make this
select * from LEXICON where myFlippedColumn LIKE flip('fi c d')
Tim,
For those who are insisting on Unicode graphemic codepoint-combination
intelligence: why can't we have a function that simply reverses the
order of the codepoints, and is blissfully ignorant about what those
individual codepoints or codepoint-combinations might signify as
graphemes in a
Unfortunately I cannot modify the query... it is supplied by an user.
Well, what about upgrading the user?
Sorry coul'd resist ... I'm already out!
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Now that I have a working tool to convert from Access .mdb to sqlitedb
files, I need one for dBASE .dbf files. Or, a conversion to .csv will
work,
too. Needs to run on linux, of course.
My Google searches turned up a bunch of tools for the Windows
platforms,
supposedly free
Hi,
Maybe many others have asked this question, so I will say sorry if
that's true.
I have a program which uses threads, when writing to (sometime even
reading
from) SQLite, I always got the error of database is locked.
I think since SQLite is a file db, so it get locked easily by
Hello! Please, help me if you have a time for this. I have an sqlite
database
table:
CREATE TABLE lemma (
id INTEGER PRIMARY KEY,
base TEXT,
preflex_id INTEGER,
type_ancode TEXT,
prefix_id INTEGER
)
In the base column I store a string which I need to compare with another
string,
Third, my oriiginal inquiry:
SELECT *
FROM fm
WHERE name LIKE '%Juiian%'
OR info LIKE '%Julian%'
ORDER by name;
returned the (correct) 6 rows.
BTW, if you or anyone else need a fuzzy compare function I have one
that can help. It works with internally Unicode-unaccented versions
I think that my problem is in using LIKE expression for non-ascii strings.
Database encode is UTF-8. When table data in the base column (see my
first
message for structure) consists of english symbols (ascii) LIKE works
correct, but when I'm trying to execute it on strings consists of UTF8
I just don't want anyone saying but
this one dude told me to replace all my structs with SQLite memory
tables.
Indeed that wouldn't be very clever SQLite promotion!
I think the best plan in this case would be to get a real language
But, surprisingly this thing is a real language, with some
Hi John,
I wouldn't use SQLite for most in memory data that never needs to be
stored on disk
Even this depends entirely on your context. Of course if only a simple
lookup in a table is more or less all you ever need, there is little
point in SQLite. But if or when your requirements get more
You read 'worse' instead of 'worst', of course!
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I think worth should be more accurate.
Yes, rotfl! I realize this while hitting Send and didn't dare one more
post.
You know, I'm a victim of rogue cosmic rays and badly need one of those
stock ECC brains. Sorry for my French accent btw!
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Nice Freudian slip!
Again rotfl, when you know that slip is French word for men underwear...
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I would like to do a where on a text field and check if the values have
non-numeric characters,
which is in this case is anything other than 1,2,3,4,5,6,7,8,9,0 or a
space
character.
Is this possible without using a UDF or a very long OR construction?
select * from mytable where mycol glob
´¯¯¯
In your specific example you could simply define a custom LIKE
function, and LIKE could become Unicode aware without any goofy new
operators.
`---
Yes of course, but I'm doing so to keep the possibility to use the
native operator as well.
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[1] Supposing some textual data already inserted as UTF-8 (default
mode) in
a dBase, and a connection opened with sqlite3_open(): Does a
sqlite3_column_text16 retrieves a correct UTF-16 content? Is to say, do
SQLite the convertion internally?
[2] Assuming the previous -or a UTF-16 content
My main point is that you can't take the UTF-16 string and safely supply
it to APIs which want UCS-2 encoded text, such as Win32 APIs (including
things like SetWindowText()). Odds are that the only library you are
using which supports UTF-16 is SQLite. You should always be converting
the text
Hi,
Please, follow Igor advices, he is right.
[1] Read the actual textual data with sqlite3_column_blob()
Which you can directly convert to TEXT if, as you say, you entered only
7-bit ASCII or UTF-8 compliant data.
[2] Assuming the system code page matches the one used when the data was
Hi,
´¯¯¯
Despite of that, I'm aware that I have some more that pure US-ASCII in
the
blob objects, in fact I'm near your situation because used the Spanish
languaje and have 8-bit extended ASCII with some special
characters -accented characters and so-.
So the question is Yes, I have upper-ANSI
Hi John,
Microsoft never seems to clearly identify whether the wide APIs should
be given UTF-16 or UCS-2. Their guide on internationalization would seem
to suggest that UCS-2 must be used, however, there is some reason to
believe that perhaps UTF-16 is handled correctly as well. Couldn't find
Thanks for the link. That clarifies things a lot. So, for the OP, if you
are targeting Win2k, it would be a good idea to use UCS-2, not UTF-16,
with any wide API calls. XP and above should (according to Kaplan and
Chen) support UTF-16 for API calls.
W2k is clearly something of the past. But
Ted,
I didn't insert it. I 'inherited' it from a (mercifully nameless)
predecessor.
I want to put this data into a database to make it easily accessible
I'm no SQLite guru (really NO), but here is my 2 cent advice.
First decide or determine what is (or shall be) your database
encoding. Even
Nico, Igor,
You're both right to point out that using SQLite would result in
non-UTF-* compliant data producing unexpected results. There is still
the possibility to store such data as blobs.
Sorry for confusion.
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Dear SQLiters,
I'm almost sure the answer is No but I'd rather ask the question anyway.
Is there _any_ situation where the v3.6.19 stock SQLite3 would create
_by itself_ temporary foreign keys not explicitely created by the user,
either or both on the referencing or on the referenced table?
Hi Igor,
Temporary foreign keys? I can't fathom what this term could possibly
mean.
Your question makes no sense to me, sorry. What problem are you really
trying to solve?
Sorry, problem solved (outside SQLite).
I noticed that after trying a DBM application I got errors saying that
a
Hi Rob,
Perhaps this might lead you in the right direction Jean-Christophe ...
#include stdarg.h
Thank you for your answer.
The va_* construct isn't portable, AFAIK. Various compilers (headers,
libraries) may (and did) implement it in different and potentially
incompatible ways.
Since in
I feel the need to wrap an SQLite printf-like function into a scalar
function.
I wish to use it as in:
select printf(format_string, list of arguments);
My question is slightly off topic but there are experienced users here
who have probably done it before.
In the scalar function
Roger,
Thank you for your answer. I knew from old days that va_* things are
very fragile (not only from the portability point of view).
In the duct tape programming situation where I currently am, the best
I can came up with is by fixing the max # of arguments to 32 and using
a _ugly_ kludge
Hi,
The following details about text/blobs returns from scalar functions
are unclear to me and I prefer doing things right.
a) is it allowable for a scalar function to modify (in place) an input
argument
and return a pointer to modified argument with
sqlite3_result_text? If yes,
what
You are trying really hard to overthink things :-)
I simply found version c-1) in a widely spread extension and was
surprised by this way of doing the return, unduly complicated and
inefficient in my poor understanding, hence the question.
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Andy,
Hwever, what I want to do is seach for all of these varients too, i.e. so
that if I search for e that I get all of the e and accented e' etc, is
this
possble using something like the collation, or do I need to specify all of
them individually?
I'm about to release the beta of an SQLite
Hi Pavel,
I believe you need to show us your sql query. Maybe something in it
forces SQLite to use UTF-16 version of the function.
Ummm, I don't kno where the problem is, but _any_ simple select will do
(for me), e.g.:
An UTF-8 base...
CREATE TABLE PaysISO (
Nom_Iso CHAR(43),
Code_Iso
Update: the problem is in the function registration.
I tried to comment out the UTF-16 registration and the really weird
thing is that using the following code, only GLOB with 3 arguments gets
actually registered (along with all 1-arg string functions and the two
collations).
There must be
If I set a breakpoint on this:
rc = sqlite3_create_function(db, p-zName, p-nArg, p-enc,
p-pContext, p-xFunc, 0, 0);
I see that sqlite3.dll is returning 5 == SQLITE_BUSY for the following
functions:
upper UTF-8
lower UTF-8
like 2-arg UTF-8
like 3-arg UTF-8
glob
The 3.6.18 sqlite3.exe CLI produces the same problem: the internal
functions below can't be overloaded and trying to do so returns 5.
System is XP Pro x86 SP3.
What can I try next ?
I see that sqlite3.dll is returning 5 == SQLITE_BUSY for the following
functions:
upper UTF-8
lower
´¯¯¯
So if a SELECT is in progress, other SELECT commands can be allowed to
proceed without problems. But no INSERT or UPDATE can be allowed until
the SELECT is finished. Hence you will sometimes get a lock on the
write.
How you deal with this, I don't know. Random wait-and-try-again ?
`---
´¯¯¯
So what am I missing?
`---
The word 'Euclidean'. Stop dividing just before the result gets
fractional and you're home.
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I'm surprised that if I register overloading functions for LIKE or GLOB
in both UTF-8 and UTF-16, only the UTF-16 version is called despite the
fact that the database is UTF-8.
I don't see the same behavior with the other scalar functions (lower,
upper), which call the UTF-8 version as
Thank you for your fast answer.
I'm surprised by this too. In fact, I cannot reproduce it.
I'm using the 3.6.18 Windows dll downloaded direct from the site.
I just re-checked that.
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Hi all,
I've been surprised that the following syntax doesn't work and returns
3 values for 4 columns diagnose message. I'm just asking by curiosity.
INSERT INTO t (a, b, c, d) VALUES ('aa', 'bb', (SELECT c, d FROM t
WHERE cond));
with cond guaranteed to select exactly one row.
I
INSERT INTO t (a, b, c, d) VALUES ('aa', 'bb', (SELECT c, d FROM t
WHERE cond));
with cond guaranteed to select exactly one row.
I don't know of any DBMS where this would be valid.
It seems so.
INSERT INTO t(a, b, c, d)
SELECT 'aa', 'bb', c, d FROM t WHERE cond;
My mistake: I had
´¯¯¯
SQLite tolerates this violation by picking the first
column from the first row as the value of such an expression. There is
no n-tuple here.
`---
That explains it very clearly now. Point taken.
Thanks.
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Pavel,
My 2 cents here is: sometimes bigger and more complicated code runs a
whole lot faster than simple one if the speed is a real concern of
course...
Indeed you're right in the general case.
In fact it wasn't at all what I really meant. My problem currently is
to have applications run,
Igor,
Can't you preallocate sufficient memory at the time the collation is
created?
Unfornately I can't do that: it would mean I place a maximum size on a
work space allocated at creation for manipulating user strings, which
is taboo in my view.
This is for getting unaccented copies of input
Roger,
´¯¯¯
There is now a ticket for this issue:
`---
Thanks, not high priority but useful someday.
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Igor,
´¯¯¯
It seems fairly easy to me to
implement the kind of collation you describe using only a fixed amount
of extra memory.
`---
I didn't say it was impossible. Just that in this case, the code gets
slowed down in convoluted loops everywhere. Also I feel that clear,
straightforward code
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