QUERY: SELECT 1 AS one;
one
---
  1
(1 row)

QUERY: SELECT 't'::bool AS true;
true
----
t   
(1 row)

QUERY: SELECT 'f'::bool AS false;
false
-----
f    
(1 row)

QUERY: SELECT 't'::bool or 'f'::bool AS true;
true
----
t   
(1 row)

QUERY: SELECT 't'::bool and 'f'::bool AS false;
false
-----
f    
(1 row)

QUERY: SELECT not 'f'::bool AS true;
true
----
t   
(1 row)

QUERY: SELECT 't'::bool = 'f'::bool AS false;
false
-----
f    
(1 row)

QUERY: SELECT 't'::bool <> 'f'::bool AS true;
true
----
t   
(1 row)

QUERY: CREATE TABLE BOOLTBL1 (f1 bool);
QUERY: INSERT INTO BOOLTBL1 (f1) VALUES ('t'::bool);
QUERY: INSERT INTO BOOLTBL1 (f1) VALUES ('True'::bool);
QUERY: INSERT INTO BOOLTBL1 (f1) VALUES ('true'::bool);
QUERY: SELECT '' AS t_3, BOOLTBL1.*;
t_3|f1
---+--
   |t 
   |t 
   |t 
(3 rows)

QUERY: SELECT '' AS t_3, BOOLTBL1.*
   FROM BOOLTBL1
   WHERE f1 = 'true'::bool;
t_3|f1
---+--
   |t 
   |t 
   |t 
(3 rows)

QUERY: SELECT '' AS t_3, BOOLTBL1.*
   FROM BOOLTBL1
   WHERE f1 <> 'false'::bool;
t_3|f1
---+--
   |t 
   |t 
   |t 
(3 rows)

QUERY: SELECT '' AS zero, BOOLTBL1.*
   FROM BOOLTBL1
   WHERE booleq('false'::bool, f1);
zero|f1
----+--
(0 rows)

QUERY: INSERT INTO BOOLTBL1 (f1) VALUES ('f'::bool);
QUERY: SELECT '' AS f_1, BOOLTBL1.*
   FROM BOOLTBL1
   WHERE f1 = 'false'::bool;
f_1|f1
---+--
   |f 
(1 row)

QUERY: CREATE TABLE BOOLTBL2 (f1 bool);
QUERY: INSERT INTO BOOLTBL2 (f1) VALUES ('f'::bool);
QUERY: INSERT INTO BOOLTBL2 (f1) VALUES ('false'::bool);
QUERY: INSERT INTO BOOLTBL2 (f1) VALUES ('False'::bool);
QUERY: INSERT INTO BOOLTBL2 (f1)
   VALUES ('XXX'::bool);
QUERY: SELECT '' AS f_4, BOOLTBL2.*;
f_4|f1
---+--
   |f 
   |f 
   |f 
   |f 
(4 rows)

QUERY: SELECT '' AS tf_12, BOOLTBL1.*, BOOLTBL2.*
   WHERE BOOLTBL2.f1 <> BOOLTBL1.f1;
tf_12|f1|f1
-----+--+--
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
(12 rows)

QUERY: SELECT '' AS tf_12, BOOLTBL1.*, BOOLTBL2.*
   WHERE boolne(BOOLTBL2.f1,BOOLTBL1.f1);
tf_12|f1|f1
-----+--+--
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
     |t |f 
(12 rows)

QUERY: SELECT '' AS ff_4, BOOLTBL1.*, BOOLTBL2.*
   WHERE BOOLTBL2.f1 = BOOLTBL1.f1 and BOOLTBL1.f1 = 'false'::bool;
ff_4|f1|f1
----+--+--
    |f |f 
    |f |f 
    |f |f 
    |f |f 
(4 rows)

QUERY: SELECT '' AS tf_12_ff_4, BOOLTBL1.*, BOOLTBL2.*
   WHERE BOOLTBL2.f1 = BOOLTBL1.f1 or BOOLTBL1.f1 = 'true'::bool
   ORDER BY BOOLTBL1.f1, BOOLTBL2.f1;
tf_12_ff_4|f1|f1
----------+--+--
          |f |f 
          |f |f 
          |f |f 
          |f |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
          |t |f 
(16 rows)

QUERY: DROP TABLE  BOOLTBL1;
QUERY: DROP TABLE  BOOLTBL2;