BUG #17109: Fail to evaluate boolean expression properly
The following bug has been logged on the website:
Bug reference: 17109
Logged by: Domingo Alvarez Duarte
Email address: mingodad@gmail.com
PostgreSQL version: 11.10
Operating system: Online at https://extendsclass.com/postgresql-onli
Description:
When proposing a change to
https://github.com/facebookincubator/CG-SQL/pull/62 people there found
several problems on their project and one of the related to how
parse/evaluate expressions around "BETWEEN" keyword and they created a
simple test case to check it (adapted by me):
====
select /*NOT*/ 1 BETWEEN -2 and 2, NOT (1 BETWEEN -2 and 2), (/*NOT*/ 1)
BETWEEN -2 and 2
====
Here is the output of PostgreSQL where the second column is not negated (if
column 1 expression is true then "NOT" that expression should return false
):
====
?column? | ?column? | ?column?
-- | -- | --
true | true | true
====
Here is the output of sqlite3:
====
sqlite3 < "test-between.sql"
1|0|1
====
It seems that I fired the trigger to early, although the output of that
website (https://extendsclass.com/postgresql-online.html) does shows
wrong result when executing the query on other places with different
PostgreSQL version the output is the expected one:
psql template1
psql (13.3)
Type "help" for help.
template1=# select /*NOT*/ 1 BETWEEN -2 and 2, NOT (1 BETWEEN -2 and 2),
(/*NOT*/ 1) BETWEEN -2 and 2
template1-# ;
?column? | ?column? | ?column?
----------+----------+----------
t | f | t
(1 row)
Show quoted text
On 15/7/21 11:38, PG Bug reporting form wrote:
The following bug has been logged on the website:
Bug reference: 17109
Logged by: Domingo Alvarez Duarte
Email address: mingodad@gmail.com
PostgreSQL version: 11.10
Operating system: Online at https://extendsclass.com/postgresql-onli
Description:When proposing a change to
https://github.com/facebookincubator/CG-SQL/pull/62 people there found
several problems on their project and one of the related to how
parse/evaluate expressions around "BETWEEN" keyword and they created a
simple test case to check it (adapted by me):====
select /*NOT*/ 1 BETWEEN -2 and 2, NOT (1 BETWEEN -2 and 2), (/*NOT*/ 1)
BETWEEN -2 and 2
====Here is the output of PostgreSQL where the second column is not negated (if
column 1 expression is true then "NOT" that expression should return false
):
====
?column? | ?column? | ?column?
-- | -- | --
true | true | true
====Here is the output of sqlite3:
====
sqlite3 < "test-between.sql"
1|0|1
====
Looking again at https://extendsclass.com/postgresql-online.html and
liasing/naming the columns it produces the expected result, so it's a
problem on their website.
Sorry by the noise, this issue can be closed.
====
select /*NOT*/ 1 BETWEEN -2 and 2 as col1, NOT (1 BETWEEN -2 and 2) as
col2, (/*NOT*/ 1) BETWEEN -2 and 2 as col3
====
Output:
====
col1 col2 col3
true false true
====
Show quoted text
On 15/7/21 11:38, PG Bug reporting form wrote:
The following bug has been logged on the website:
Bug reference: 17109
Logged by: Domingo Alvarez Duarte
Email address: mingodad@gmail.com
PostgreSQL version: 11.10
Operating system: Online at https://extendsclass.com/postgresql-onli
Description:When proposing a change to
https://github.com/facebookincubator/CG-SQL/pull/62 people there found
several problems on their project and one of the related to how
parse/evaluate expressions around "BETWEEN" keyword and they created a
simple test case to check it (adapted by me):====
select /*NOT*/ 1 BETWEEN -2 and 2, NOT (1 BETWEEN -2 and 2), (/*NOT*/ 1)
BETWEEN -2 and 2
====Here is the output of PostgreSQL where the second column is not negated (if
column 1 expression is true then "NOT" that expression should return false
):
====
?column? | ?column? | ?column?
-- | -- | --
true | true | true
====Here is the output of sqlite3:
====
sqlite3 < "test-between.sql"
1|0|1
====