blob: 8767396c59943aee934018517dc29268967f716d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
CREATE SCHEMA IF NOT EXISTS pwc154;
CREATE OR REPLACE FUNCTION
pwc154.padovan_plperl( int )
RETURNS int
AS $CODE$
return 1 if $_[0] <= 2;
my ( $a, $b ) = ( $_[ 0 ] - 3, $_[ 0 ] - 2 );
my $rs = spi_exec_query( "SELECT pwc154.padovan_plperl( $a ) + pwc154.padovan_plperl( $b ) AS p" );
return $rs->{ rows }[ 0 ]->{ p };
$CODE$
LANGUAGE plperl;
CREATE OR REPLACE FUNCTION
pwc154.plperl_is_prime( int )
RETURNS bool
AS $CODE$
for my $i ( 2 .. ( $_[0] - 1 ) ) {
return 0 if $_[0] % $i == 0;
}
return 1;
$CODE$
LANGUAGE plperl;
CREATE OR REPLACE FUNCTION
pwc154.padovans_up_to( int )
RETURNS SETOF int
AS $CODE$
for my $i ( 0 .. $_[ 0 ] ) {
my $rs = spi_exec_query( "SELECT pwc154.padovan_plperl( $i ) AS p" );
return_next( $rs->{ rows }[ 0 ]->{ p } );
}
return undef;
$CODE$
LANGUAGE plperl;
SELECT distinct( p.p )
FROM pwc154.padovans_up_to( 50 ) p
WHERE pwc154.plperl_is_prime( p.p ) = true
ORDER BY 1
LIMIT 10;
|
