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CREATE OR REPLACE FUNCTION plperl_sum_array(INTEGER[]) RETURNS text AS $$
my $array_arg = shift;
my $result = 0;
my @arrays;
push @arrays, @$array_arg;
while (@arrays > 0) {
my $el = shift @arrays;
if (is_array_ref($el)) {
push @arrays, @$el;
} else {
$result += $el;
}
}
return $result.' '.$array_arg;
$$ LANGUAGE plperl;
select plperl_sum_array('{1,2,NULL}');
plperl_sum_array
------------------
3 {1,2,NULL}
(1 row)
select plperl_sum_array('{}');
plperl_sum_array
------------------
0 {}
(1 row)
select plperl_sum_array('{{1,2,3}, {4,5,6}}');
plperl_sum_array
----------------------
21 {{1,2,3},{4,5,6}}
(1 row)
select plperl_sum_array('{{{1,2,3}, {4,5,6}}, {{7,8,9}, {10,11,12}}}');
plperl_sum_array
---------------------------------------------
78 {{{1,2,3},{4,5,6}},{{7,8,9},{10,11,12}}}
(1 row)
-- check whether we can handle arrays of maximum dimension (6)
select plperl_sum_array(ARRAY[[[[[[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]]]]],
[[[[[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]]]]]]);
plperl_sum_array
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1056 {{{{{{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}}}}},{{{{{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}}}}}}
(1 row)
-- what would we do with the arrays exceeding maximum dimension (7)
select plperl_sum_array('{{{{{{{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}}}}},
{{{{{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}}}}}},
{{{{{{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}}}}},
{{{{{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}}}}}}}'
);
ERROR: number of array dimensions (7) exceeds the maximum allowed (6)
LINE 1: select plperl_sum_array('{{{{{{{1,2},{3,4}},{{5,6},{7,8}}},{...
^
select plperl_sum_array('{{{1,2,3}, {4,5,6,7}}, {{7,8,9}, {10, 11, 12}}}');
ERROR: malformed array literal: "{{{1,2,3}, {4,5,6,7}}, {{7,8,9}, {10, 11, 12}}}"
LINE 1: select plperl_sum_array('{{{1,2,3}, {4,5,6,7}}, {{7,8,9}, {1...
^
DETAIL: Multidimensional arrays must have sub-arrays with matching dimensions.
CREATE OR REPLACE FUNCTION plperl_concat(TEXT[]) RETURNS TEXT AS $$
my $array_arg = shift;
my $result = "";
my @arrays;
push @arrays, @$array_arg;
while (@arrays > 0) {
my $el = shift @arrays;
if (is_array_ref($el)) {
push @arrays, @$el;
} else {
$result .= $el;
}
}
return $result.' '.$array_arg;
$$ LANGUAGE plperl;
select plperl_concat('{"NULL","NULL","NULL''"}');
plperl_concat
-------------------------------------
NULLNULLNULL' {"NULL","NULL",NULL'}
(1 row)
select plperl_concat('{{NULL,NULL,NULL}}');
plperl_concat
---------------------
{{NULL,NULL,NULL}}
(1 row)
select plperl_concat('{"hello"," ","world!"}');
plperl_concat
---------------------------------
hello world! {hello," ",world!}
(1 row)
-- array of rows --
CREATE TYPE foo AS (bar INTEGER, baz TEXT);
CREATE OR REPLACE FUNCTION plperl_array_of_rows(foo[]) RETURNS TEXT AS $$
my $array_arg = shift;
my $result = "";
for my $row_ref (@$array_arg) {
die "not a hash reference" unless (ref $row_ref eq "HASH");
$result .= $row_ref->{bar}." items of ".$row_ref->{baz}.";";
}
return $result .' '. $array_arg;
$$ LANGUAGE plperl;
select plperl_array_of_rows(ARRAY[ ROW(2, 'coffee'), ROW(0, 'sugar')]::foo[]);
plperl_array_of_rows
----------------------------------------------------------------
2 items of coffee;0 items of sugar; {"(2,coffee)","(0,sugar)"}
(1 row)
-- composite type containing arrays
CREATE TYPE rowfoo AS (bar INTEGER, baz INTEGER[]);
CREATE OR REPLACE FUNCTION plperl_sum_row_elements(rowfoo) RETURNS TEXT AS $$
my $row_ref = shift;
my $result;
if (ref $row_ref ne 'HASH') {
$result = 0;
}
else {
$result = $row_ref->{bar};
die "not an array reference".ref ($row_ref->{baz})
unless (is_array_ref($row_ref->{baz}));
# process a single-dimensional array
foreach my $elem (@{$row_ref->{baz}}) {
$result += $elem unless ref $elem;
}
}
return $result;
$$ LANGUAGE plperl;
select plperl_sum_row_elements(ROW(1, ARRAY[2,3,4,5,6,7,8,9,10])::rowfoo);
plperl_sum_row_elements
-------------------------
55
(1 row)
-- composite type containing array of another composite type, which, in order,
-- contains an array of integers.
CREATE TYPE rowbar AS (foo rowfoo[]);
CREATE OR REPLACE FUNCTION plperl_sum_array_of_rows(rowbar) RETURNS TEXT AS $$
my $rowfoo_ref = shift;
my $result = 0;
if (ref $rowfoo_ref eq 'HASH') {
my $row_array_ref = $rowfoo_ref->{foo};
if (is_array_ref($row_array_ref)) {
foreach my $row_ref (@{$row_array_ref}) {
if (ref $row_ref eq 'HASH') {
$result += $row_ref->{bar};
die "not an array reference".ref ($row_ref->{baz})
unless (is_array_ref($row_ref->{baz}));
foreach my $elem (@{$row_ref->{baz}}) {
$result += $elem unless ref $elem;
}
}
else {
die "element baz is not a reference to a rowfoo";
}
}
} else {
die "not a reference to an array of rowfoo elements"
}
} else {
die "not a reference to type rowbar";
}
return $result;
$$ LANGUAGE plperl;
select plperl_sum_array_of_rows(ROW(ARRAY[ROW(1, ARRAY[2,3,4,5,6,7,8,9,10])::rowfoo,
ROW(11, ARRAY[12,13,14,15,16,17,18,19,20])::rowfoo])::rowbar);
plperl_sum_array_of_rows
--------------------------
210
(1 row)
-- check arrays as out parameters
CREATE OR REPLACE FUNCTION plperl_arrays_out(OUT INTEGER[]) AS $$
return [[1,2,3],[4,5,6]];
$$ LANGUAGE plperl;
select plperl_arrays_out();
plperl_arrays_out
-------------------
{{1,2,3},{4,5,6}}
(1 row)
-- check that we can return the array we passed in
CREATE OR REPLACE FUNCTION plperl_arrays_inout(INTEGER[]) returns INTEGER[] AS $$
return shift;
$$ LANGUAGE plperl;
select plperl_arrays_inout('{{1}, {2}, {3}}');
plperl_arrays_inout
---------------------
{{1},{2},{3}}
(1 row)
-- check that we can return an array literal
CREATE OR REPLACE FUNCTION plperl_arrays_inout_l(INTEGER[]) returns INTEGER[] AS $$
return shift.''; # stringify it
$$ LANGUAGE plperl;
select plperl_arrays_inout_l('{{1}, {2}, {3}}');
plperl_arrays_inout_l
-----------------------
{{1},{2},{3}}
(1 row)
-- check output of multi-dimensional arrays
CREATE FUNCTION plperl_md_array_out() RETURNS text[] AS $$
return [['a'], ['b'], ['c']];
$$ LANGUAGE plperl;
select plperl_md_array_out();
plperl_md_array_out
---------------------
{{a},{b},{c}}
(1 row)
CREATE OR REPLACE FUNCTION plperl_md_array_out() RETURNS text[] AS $$
return [[], []];
$$ LANGUAGE plperl;
select plperl_md_array_out();
plperl_md_array_out
---------------------
{}
(1 row)
CREATE OR REPLACE FUNCTION plperl_md_array_out() RETURNS text[] AS $$
return [[], [1]];
$$ LANGUAGE plperl;
select plperl_md_array_out(); -- fail
ERROR: multidimensional arrays must have array expressions with matching dimensions
CONTEXT: PL/Perl function "plperl_md_array_out"
CREATE OR REPLACE FUNCTION plperl_md_array_out() RETURNS text[] AS $$
return [[], 1];
$$ LANGUAGE plperl;
select plperl_md_array_out(); -- fail
ERROR: multidimensional arrays must have array expressions with matching dimensions
CONTEXT: PL/Perl function "plperl_md_array_out"
CREATE OR REPLACE FUNCTION plperl_md_array_out() RETURNS text[] AS $$
return [1, []];
$$ LANGUAGE plperl;
select plperl_md_array_out(); -- fail
ERROR: multidimensional arrays must have array expressions with matching dimensions
CONTEXT: PL/Perl function "plperl_md_array_out"
CREATE OR REPLACE FUNCTION plperl_md_array_out() RETURNS text[] AS $$
return [[1], [[]]];
$$ LANGUAGE plperl;
select plperl_md_array_out(); -- fail
ERROR: multidimensional arrays must have array expressions with matching dimensions
CONTEXT: PL/Perl function "plperl_md_array_out"
-- make sure setof works
create or replace function perl_setof_array(integer[]) returns setof integer[] language plperl as $$
my $arr = shift;
for my $r (@$arr) {
return_next $r;
}
return undef;
$$;
select perl_setof_array('{{1}, {2}, {3}}');
perl_setof_array
------------------
{1}
{2}
{3}
(3 rows)
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