NULLIF crashes when first parameter is constant empty string [CORE1560]

[firebird-automations]

Submitted by: Vladimir Kozlov (vkozlov)

Is related to QA199

NULLIF crashes when first parameter is constant empty string and second parameter is constant or variable with empty string.

for example:

declare variable i varchar(10);
declare variable j varchar(10);

i = ''; j = nullif(i,i); - works

i = 'aaa'; j = nullif('',i); - works

i = ''; j = nullif('',i); - server crashes

Easiest way to reproduce:

select nullif('','') from rdb$database

Commits: 82d480d

[firebird-automations]

Commented by: Vladimir Kozlov (vkozlov)

2.1.0.16967 affected too.

[firebird-automations]

Modified by: Vladimir Kozlov (vkozlov)

description: Server crashes when inserting in GTT.

To reproduce, make a GTT on empty database:

create global temporary table doc$70$invoice (
iddocrow varchar(40) not null,
idgoods integer not null,
qty integer not null,
price double precision not null,
invamt double precision not null,
custcode varchar(40),
custproc double precision,
custposhl double precision,
custacciz double precision,
custtva double precision,
inv_plus_cust double precision,
udeln_summ_rash double precision,
inv_plus_cust_plus_rash double precision,
rezerv2182 integer,
recompriceopt double precision,
recompriceprim double precision,
newsprice double precision
) on commit delete rows;

alter table doc$70$invoice add constraint pk_doc$70$invoice primary key (iddocrow);

and try to execute insert (from IBExpert's SQL Editor)

INSERT INTO doc$70$invoice (iddocrow,idgoods,qty,price,invamt,custcode,recompriceopt,recompriceprim)
VALUES ( 'a975ce58-c1cf-11db-8000-e503b22223f1' , 136171 , 1056 , 67 , 1056 * 67 ,
'1' ,NULLIF( '' ,''), NULLIF( '' ,''))

After this server crashes.

=>

NULLIF crashes when first parameter is constant empty string and second parameter is constant or variable with empty string.

for example:

declare variable i varchar(10);
declare variable j varchar(10);

i = ''; j = nullif(i,i); - works

i = 'aaa'; j = nullif('',i); - works

i = ''; j = nullif('',i); - server crashes

Easiest way to reproduce:

select nullif('','') from rdb$database

summary: Server crashes when insert to GTT => NULLIF crashes when first parameter is constant empty string

[firebird-automations]

Modified by: @AlexPeshkoff

assignee: Alexander Peshkov [ alexpeshkoff ]

[firebird-automations]

Commented by: @AlexPeshkoff

Cast from NULL to string value of 0 length was broken. Looks like it happened only with nullif('','').

[firebird-automations]

Modified by: @AlexPeshkoff

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 2.1 RC1 [ 10201 ]

[firebird-automations]

Modified by: @pcisar

Link: This issue is related to QA199 [ QA199 ]

[firebird-automations]

Modified by: @pcisar

Workflow: jira [ 13373 ] => Firebird [ 14025 ]

[firebird-automations]

Commented by: @pmakowski

Q/A test ok

[firebird-automations]

Modified by: @pmakowski

status: Resolved [ 5 ] => Closed [ 6 ]

[firebird-automations]

Modified by: @pavel-zotov

status: Closed [ 6 ] => Closed [ 6 ]

QA Status: Done successfully