Hi,
the current documentation on generate_subscripts() uses a
"rectangular" example, i. e. where both arrays in question
have the same length (that is furthermore equal to the num-
ber of arrays, a "square" example so to speak :-)). To point
out that generate_subscripts () can be used for more complex
cases as well, please find attached patch.
Tim
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 3419440..2677db9 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -11427,21 +11427,22 @@ select generate_subscripts('{NULL,1,NULL,2}'::int[], 1) as s;
-- presenting an array, the subscript and the subscripted
-- value requires a subquery
select * from arrays;
- a
---------------------
+ a
+---------------
{-1,-2}
- {100,200}
-(2 rows)
+ {100,200,300}
+(2 Zeilen)
select a as array, s as subscript, a[s] as value
from (select generate_subscripts(a, 1) as s, a from arrays) foo;
- array | subscript | value
------------+-----------+-------
- {-1,-2} | 1 | -1
- {-1,-2} | 2 | -2
- {100,200} | 1 | 100
- {100,200} | 2 | 200
-(4 rows)
+ array | subscript | value
+---------------+-----------+-------
+ {-1,-2} | 1 | -1
+ {-1,-2} | 2 | -2
+ {100,200,300} | 1 | 100
+ {100,200,300} | 2 | 200
+ {100,200,300} | 3 | 300
+(5 Zeilen)
-- unnest a 2D array
create or replace function unnest2(anyarray)
