[sqlite] How to avoid the fts rebuilding when add a column on fts table?

[zheng xiaojin]

we are using FTS5 to support my business. But find it so intolerable that Every 
time when I wanr to add one business column which will also be added on fts 
table, I need to drop all the fts.table and rebulid again.
Can.you help me or if you have any develop  plan about this problem?
Thank you!


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Re: [sqlite] here is my test case//Re: SQLITE3 FTS5 prefix query get mismatch result

[zheng xiaojin]

OK，Thank you very much，I will have a try

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From: sqlite-users <sqlite-users-boun...@mailinglists.sqlite.org> on behalf of 
Dan Kennedy <danielk1...@gmail.com>
Sent: Thursday, March 22, 2018 7:26:29 PM
To: sqlite-users@mailinglists.sqlite.org
Subject: Re: [sqlite] here is my test case//Re: SQLITE3 FTS5 prefix query get 
mismatch result

On 03/22/2018 06:05 PM, Dan Kennedy wrote:
> On 03/22/2018 05:38 PM, zheng xiaojin wrote:
>> Sorry, but testcase maybe have some format problem, changed belowed,
>> I run this on SQLITE 3.15.2, both on Windows and linux. and only less
>> than 2min can happen. It doesn't matter about threadsafe, because the
>> write func is only used to protect the test data. It means you can
>> stop the. write func when problem happen, and then you can just shell
>> to the db and run the same query then problem happen definitely.
>
>
> Can you do that (create a db that exhibits the problem) and upload it
> somewhere or email it directly to me? Then I'll be able to demonstrate
> the problem using just the shell.

Actually don't worry. I finally got it to work. I think it's the bug
fixed exactly a year and a day ago here:

   http://www.sqlite.org/src/info/840042cb2bed2924

Fix was published in 3.19.0. Can you confirm that 3.19.0 do not produce
the problem for you?

Thanks,
Dan.





>
> Thanks,
> Dan.
>
>
>
>>
>>
>>
>>> "create trigger if not exists trigger_insert_tbl after insert on tbl \
>>> begin \
>>> replace into tbl_fts(rowid, name, uid)
>>> values(new.rowid<http://new.rowid>,new.name<http://new.name>,,new.uid<http://new.uid>);
>>> \
>>> end;",
>>> "create trigger if not exists trigger_update_tbl after update on tbl \
>>> begin \
>>> replace into tbl_fts(rowid, name, uid)
>>> values(new.rowi<http://new.rowid>d,new.name<http://new.name>,new.uid<http://new.uid>);\
>>> end;"
>>
>> ?取 Outlook for Android<https://aka.ms/ghei36>
>>
>> 
>> From: sqlite-users <sqlite-users-boun...@mailinglists.sqlite.org> on
>> behalf of Dan Kennedy <danielk1...@gmail.com>
>> Sent: Thursday, March 22, 2018 4:56:15 PM
>> To: sqlite-users@mailinglists.sqlite.org
>> Subject: Re: [sqlite] here is my test case//Re: SQLITE3 FTS5 prefix
>> query get mismatch result
>>
>> On 03/21/2018 03:16 PM, zheng xiaojin wrote:
>>> (Please add.the head file and sqlite lib yourself, Thank you very much)
>>
>> Hi,
>>
>> Thanks for doing this. I'm running this version of the test program
>> modified for posix threads:
>>
>> https://pastebin.com/d1HCX2aJ
>>
>> but I haven't seen any errors yet. How long do you usually have to run
>> it for before seeing the mismatch error?
>>
>> Which version of SQLite are you seeing the errors with?
>>
>> Are you building SQLite with SQLITE_THREADSAFE=0?
>>
>> Do you have access to a Linux or similar system on which you can run the
>> pthreads version above? Does it produce errors for you?
>>
>> Thanks,
>> Dan Kennedy.
>>
>>
>>
>>
>>
>>> char *orgName[] = {
>>> "yun j ji yunji yunj yji yj z zh zha zhao q qi qia qian d du dua
>>> duan zhaoqian zhaoq zhqian zhq zqian zq qianduan qiand qduan qd
>>> zhaoqianduan zhaoqiand zhaoqduan zhaoqd zhqianduan zhqiand zhqduan
>>> zhqd zqianduan zqiand zqduan zqd",
>>> "murren m mu l lu lun mulun mul mlun ml",
>>> "l lu m ma man luman lum lman lm",
>>> "d   di   din   ding   d   di   din   ding   f   fu   w   wu
>>> dingding   dingd   dding   dd   dingfu   dingf   dfu   df fuwu
>>> fuw   fwu   fw   dingdingfu   dingdingf   dingdfu dingdf   ddingfu
>>> ddingf   ddfu   ddf   dingfuwu   dingfuw dingfwu   dingfw   dfuwu
>>> dfuw   dfwu   dfw   dingdingfuwu dingdingfuw   dingdingfwu
>>> dingdingfw   dingdfuwu dingdfuw   dingdfwu   dingdfw   ddingfuwu
>>> ddingfuw ddingfwu   ddingfw   ddfuwu   ddfuw   ddfwu   ddfw   l   li
>>> x   xi   xia   lixia   lix   lxia   lx",
>>> "lucy y ya yan x xi yanxi yanx yxi yx",
>>> "p pe pen peng l le lei penglei pengl plei pl lucy"
>>> };
>>> char *nickName[] = {
>>> "ab",
>>> "bc",
>>> "cd",
>>> "de",
>>> "ef",
>>> "fg"
>>> };
>>> int id[] = { 21078,21218,211

Re: [sqlite] here is my test case//Re: SQLITE3 FTS5 prefix query get mismatch result

[zheng xiaojin]

Sorry, but testcase maybe have some format problem, changed belowed,
I run this on SQLITE 3.15.2, both on Windows and linux. and only less than 2min 
can happen. It doesn't matter about threadsafe, because the write func is only 
used to protect the test data. It means you can stop the. write func when 
problem happen, and then you can just shell to the db and run the same query 
then problem happen definitely.



> "create trigger if not exists trigger_insert_tbl after insert on tbl \
> begin \
> replace into tbl_fts(rowid, name, uid) 
> values(new.rowid<http://new.rowid>,new.name<http://new.name>,,new.uid<http://new.uid>);
>  \
> end;",
> "create trigger if not exists trigger_update_tbl after update on tbl \
> begin \
> replace into tbl_fts(rowid, name, uid) 
> values(new.rowi<http://new.rowid>d,new.name<http://new.name>,new.uid<http://new.uid>);\
> end;"


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From: sqlite-users <sqlite-users-boun...@mailinglists.sqlite.org> on behalf of 
Dan Kennedy <danielk1...@gmail.com>
Sent: Thursday, March 22, 2018 4:56:15 PM
To: sqlite-users@mailinglists.sqlite.org
Subject: Re: [sqlite] here is my test case//Re: SQLITE3 FTS5 prefix query get 
mismatch result

On 03/21/2018 03:16 PM, zheng xiaojin wrote:
> (Please add.the head file and sqlite lib yourself, Thank you very much)


Hi,

Thanks for doing this. I'm running this version of the test program
modified for posix threads:

   https://pastebin.com/d1HCX2aJ

but I haven't seen any errors yet. How long do you usually have to run
it for before seeing the mismatch error?

Which version of SQLite are you seeing the errors with?

Are you building SQLite with SQLITE_THREADSAFE=0?

Do you have access to a Linux or similar system on which you can run the
pthreads version above? Does it produce errors for you?

Thanks,
Dan Kennedy.





>
> char *orgName[] = {
> "yun j ji yunji yunj yji yj z zh zha zhao q qi qia qian d du dua duan 
> zhaoqian zhaoq zhqian zhq zqian zq qianduan qiand qduan qd zhaoqianduan 
> zhaoqiand zhaoqduan zhaoqd zhqianduan zhqiand zhqduan zhqd zqianduan zqiand 
> zqduan zqd",
> "murren m mu l lu lun mulun mul mlun ml",
> "l lu m ma man luman lum lman lm",
> "d   di   din   ding   d   di   din   ding   f   fu   w   wu   dingding   
> dingd   dding   dd   dingfu   dingf   dfu   df   fuwu   fuw   fwu   fw   
> dingdingfu   dingdingf   dingdfu   dingdf   ddingfu   ddingf   ddfu   ddf   
> dingfuwu   dingfuw   dingfwu   dingfw   dfuwu   dfuw   dfwu   dfw   
> dingdingfuwu   dingdingfuw   dingdingfwu   dingdingfw   dingdfuwu   dingdfuw  
>  dingdfwu   dingdfw   ddingfuwu   ddingfuw   ddingfwu   ddingfw   ddfuwu   
> ddfuw   ddfwu   ddfw   l   li   x   xi   xia   lixia   lix   lxia   lx",
> "lucy y ya yan x xi yanxi yanx yxi yx",
> "p pe pen peng l le lei penglei pengl plei pl lucy"
> };
> char *nickName[] = {
> "ab",
> "bc",
> "cd",
> "de",
> "ef",
> "fg"
> };
> int id[] = { 21078,21218,21125,53234,40824,164873 };
>
> void prepareSchema_prefix(sqlite3 *db) {
> char *schemas[] = {
> "PRAGMA journal_mode=WAL;",
> "drop table if exists tbl;",
> "drop table if exists tbl_fts;",
> "create table if not exists tbl(name text, uid int primary key, nick text);",
> "create virtual table if not exists tbl_fts USING fts5(name, uid);",
> "create trigger if not exists trigger_insert_tbl after insert on tbl \
> begin \
> replace into tbl_fts(rowid, name, uid) 
> values(new.rowid<http://new.rowid>,new.name<http://new.name>,new.uid<http://new.uid>);
>  \
> end;",
> "create trigger if not exists trigger_update_tbl after update on tbl \
> begin \
> replace into tbl_fts(rowid, name, uid) 
> values(new.rowid<http://new.rowid>,new.name<http://new.name>,new.uid<http://new.uid>);\
> end;"
> };
> int i, j, rc, cnt;
> cnt = sizeof(schemas) / sizeof(char*);
> char *errMsg;
> for (i = 0; i < cnt; i++) {
> rc = sqlite3_exec(db, schemas[i], NULL, NULL, );
> if (rc != SQLITE_OK& != SQLITE_DONE) {
> printf("prepareSchema error: %s\n", errMsg);
> return;
> }
> }
> printf("prepareSchema over\n");
> }
>
> void fts5_prefix_match_test() {
> sqlite3 *db;
> int i, j, k, rc;
> char *errMsg;
> char *append = "abcdefghijklmnopqrstuvwxyz";
> sqlite3_open("a.db<http://a.db>", );
> prepareSchema_prefix(db);
> int test_cnt = 300, rc_copy = 0;
> char zSql[2048];
> char *tmp;
> const int len_zSql = 2047;
> int len_left;
> int 

[sqlite] here is my test case//Re: SQLITE3 FTS5 prefix query get mismatch result

[zheng xiaojin]

pazResult[i*nCol + j]);
}
printf("\n");
}
return 0;
}
else {
printf("match cnt = %d\n", nRow);
}
sqlite3_free_table(pazResult);
sqlite3_sleep(3000);
}
return 0;
}
#define THREAD_NUM 2

int thread(ThreadFuncType writeFunc, ThreadFuncType readFunc) {
HANDLE handle[THREAD_NUM];
if (writeFunc) {
handle[0] = (HANDLE)_beginthreadex(NULL, 0, writeFunc, NULL, 0, NULL);
//WaitForMultipleObjects(1, handle, TRUE, INFINITE);
}
if (readFunc) {
for (int i = 1; i < THREAD_NUM; i++) {
handle[i] = (HANDLE)_beginthreadex(NULL, 0, readFunc, NULL, 0, NULL);
Sleep(5);
}
if (writeFunc) {
WaitForMultipleObjects(THREAD_NUM, [0], TRUE, INFINITE);
}
else {
WaitForMultipleObjects(THREAD_NUM - 1, [1], TRUE, INFINITE);
}
printf("multithread are all over now.\n");
}
else {
WaitForMultipleObjects(1, [0], TRUE, INFINITE);
printf("multithread are all over now.\n");
}
return 0;
}

int main() {
thread(writeFunc, readFunc);
return 0;
}






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From: sqlite-users <sqlite-users-boun...@mailinglists.sqlite.org> on behalf of 
Dan Kennedy <danielk1...@gmail.com>
Sent: Tuesday, March 20, 2018 7:49:37 PM
To: sqlite-users@mailinglists.sqlite.org
Subject: Re: [sqlite] SQLITE3 FTS5 prefix query get mismatch result

On 03/20/2018 02:31 PM, zheng xiaojin wrote:
> (I am not sure whether you have seen my message, so resend again)
> Hi,
> When I use FTS5, I have met that, there are some cases which will get 
> mis-match results with prefix search.
>
> Like "select * from tbl_fts where tbl_fts match 'lucy*';"，which I want to get 
> records like "lucya","lucyabc" etc, and
>
> "lux" or "lulu" is not what I want but returned.
>
> Such problems are not common, But I have tried to build such test case which 
> can lead to this problem very easy.

Thanks for looking into and reporting this problem. Are you able to post
the source for the program you used to execute the test described below?

Dan.


> Here is how I generate it:
>
> 1) create an fts5 table. and insert some record like "lucya","lucyb".
>
> 2) prepare some records: a) lusheng b)lulu; c)lunix; d)luma; e) pengyu. 
> a,b,c,d are have some same prefix(lu), e is some other random case.
>
> 3) before insert into the fts table with 2) records, appending some random 
> letter to make each record different.
>
> Like: "lulu","luluabc","luluefg", also "lunix","lunixabc",etc
>
> 4) for-loop insert, and each loop trying to lantch the query 'lucy*', \
>
> check the match result will finding the mis-match result, the corrent results 
> should be "lucya","lucyb", not "luluabc"...
>
>
> When mis-match happen, I try to analyze the prefix search mechanism and find 
> that, there are 2 points which I think have problems:
>
> 1) fts5LeafSeek, when search failed, and exec goto search_failed, in 
> search_failed, the 2 if condition will not satisfy commonly. In my mind, I 
> think it should return,
>
> but not, and then the search_success logic exec.
>
> 2) fts5SetupPrefixIter, when gather results, the logic to set the flag 
> bNewTerm has some leak, which will set bNewTerm=false,
>
> but the record is not what we want indeed.
>
>
> These 2 logic problems lead to mis-match results. I try to remove the 
> bNewTerm logic directly, and make it compare every loog,
>
> then, the mis-match results disappear.
>
> // relevant code
>
> Change below
>
> if (bNewTerm) {
>
> if (nTerm < nToken || memcmp(pToken, pTerm, nToken)) break;
>
> }
>
> to
>
> if (nTerm < nToken || memcmp(pToken, pTerm, nToken)) break;
>
>
> Need your help to recheck the FTS5 prefix search logic, thank you very much.
>
> Yours,
>
> xiaojin zheng
>
>
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>
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[sqlite] SQLITE3 FTS5 prefix query get mismatch result

[zheng xiaojin]

(I am not sure whether you have seen my message, so resend again)
Hi,
When I use FTS5, I have met that, there are some cases which will get mis-match 
results with prefix search.

Like "select * from tbl_fts where tbl_fts match 'lucy*';"，which I want to get 
records like "lucya","lucyabc" etc, and

"lux" or "lulu" is not what I want but returned.

Such problems are not common, But I have tried to build such test case which 
can lead to this problem very easy. Here is how I generate it:

1) create an fts5 table. and insert some record like "lucya","lucyb".

2) prepare some records: a) lusheng b)lulu; c)lunix; d)luma; e) pengyu. a,b,c,d 
are have some same prefix(lu), e is some other random case.

3) before insert into the fts table with 2) records, appending some random 
letter to make each record different.

Like: "lulu","luluabc","luluefg", also "lunix","lunixabc",etc

4) for-loop insert, and each loop trying to lantch the query 'lucy*', \

check the match result will finding the mis-match result, the corrent results 
should be "lucya","lucyb", not "luluabc"...


When mis-match happen, I try to analyze the prefix search mechanism and find 
that, there are 2 points which I think have problems:

1) fts5LeafSeek, when search failed, and exec goto search_failed, in 
search_failed, the 2 if condition will not satisfy commonly. In my mind, I 
think it should return,

but not, and then the search_success logic exec.

2) fts5SetupPrefixIter, when gather results, the logic to set the flag bNewTerm 
has some leak, which will set bNewTerm=false,

but the record is not what we want indeed.


These 2 logic problems lead to mis-match results. I try to remove the bNewTerm 
logic directly, and make it compare every loog,

then, the mis-match results disappear.

// relevant code

Change below

if (bNewTerm) {

if (nTerm < nToken || memcmp(pToken, pTerm, nToken)) break;

}

to

if (nTerm < nToken || memcmp(pToken, pTerm, nToken)) break;


Need your help to recheck the FTS5 prefix search logic, thank you very much.

Yours,

xiaojin zheng


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[sqlite] Problem: FTS5 prefix search getting the mis-match result

[zheng xiaojin]

Hi,
When I use FTS5, I have met that, there are some cases which will get mis-match 
results with prefix search.
Like "select * from tbl_fts where tbl_fts match 'lucy*';"，which I want to get 
records like "lucya","lucyabc" etc, and
"lux" or "lulu" is not what I want but returned.
Such problems are not common, But I have tried to build such test case which 
can lead to this problem very easy. Here is how I generate it:
1) create an fts5 table. and insert some record like "lucya","lucyb".
2) prepare some records: a) lusheng b)lulu; c)lunix; d)luma; e) pengyu.  
a,b,c,d are have some same prefix(lu), e is some other random case.
3) before insert into the fts table with 2) records, appending some random 
letter to make each record different.
   Like: "lulu","luluabc","luluefg", also "lunix","lunixabc",etc
4) for-loop insert, and each loop trying to lantch the query 'lucy*', \
check the match result will finding the mis-match result, the corrent results 
should be "lucya","lucyb", not "luluabc"...

When mis-match happen, I try to analyze the prefix search mechanism and find 
that, there are 2 points which I think have problems:
1) fts5LeafSeek, when search failed, and exec goto search_failed, in 
search_failed, the 2 if condition will not satisfy commonly. In my mind, I 
think it should return,
but not, and then the search_success logic exec.
2) fts5SetupPrefixIter, when gather results, the logic to set the flag bNewTerm 
has some leak, which will set bNewTerm=false,
but the record is not what we want indeed.

These 2 logic problems lead to mis-match results. I try to remove the bNewTerm 
logic directly, and make it compare every loog,
then, the mis-match results disappear.
// relevant code
Change below
if (bNewTerm) {
if (nTerm < nToken || memcmp(pToken, pTerm, nToken)) break;
}
to
if (nTerm < nToken || memcmp(pToken, pTerm, nToken)) break;

Need your help to recheck the FTS5 prefix search logic, thank you very much.
Yours,
xiaojin zheng

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[sqlite] pcache1FetchStage2 CRASH

[zheng xiaojin]

I am using the 3.15.2, and currently a problem comes to me that, 
pcache1FetchStage2 CRASH when access the pgroup->lru.pLRUPrev->isAnchor, the 
crash info is sigsegv access 0x16 on IOS.
And a little frequently about0.1percent.

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