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|
--
\set VERBOSITY terse
--
--
-- By having a real table with both short and long array values,
-- we get to involve both short varlenas and external toast.
--
create temp table adata (id serial,
a integer[],
b text[],
c numeric[],
d date[]);
insert into adata(a) values
(array[1,2]),
(array[10,20,30,40,50]),
(array(select i from generate_series(1,100) i)),
(array(select i from generate_series(1,100000) i)),
('{}');
insert into adata(b) values
('{}'),
(array['foo','bar','baz']),
(array(select 'val'||i from generate_series(1,100) i)),
(array(select 'val'||i from generate_series(1,10000) i));
insert into adata(c) values
('{}'),
(array[1.234,exp(1.0::numeric(32,30)),factorial(27)]),
(array(select i from generate_series(1,100) i)),
(array(select i from generate_series(1,10000) i));
insert into adata(d) values
('{}'),
(array[date '2017-12-11', '1968-05-10', '1983-09-26', '1962-10-27']),
(array(select date '2017-01-01' + i from generate_series(0,364,18) i));
do language pllua $$
package.preload['myutil'] = function()
local expect_next =
{ string = function(s)
return string.gsub(s, "%d+$",
function(n)
return string.format("%d", n + 1)
end)
end,
number = function(n) return n + 1 end,
[pgtype.numeric] = function(n) return n + 1 end,
}
local function map(a,f)
local r = {}
for i = 1,#a do r[#r+1] = f(a[i]) end
return r
end
local function summarize(a)
if a == nil then return nil end
local expect,first_match,result = nil,nil,{}
for i = 1,#a do
if first_match == nil then
expect,first_match = a[i],i
elseif a[i] ~= expect then
if first_match < i-1 then
result[#result+1] = { a[first_match], a[i-1] }
else
result[#result+1] = a[i-1]
end
expect,first_match = a[i],i
end
--[[ update the "expected" next element ]]
expect = (expect_next[pgtype(expect) or type(expect)]
or function(x) return x end)(expect)
end
if first_match == #a then
result[#result+1] = a[#a]
elseif first_match ~= nil then
result[#result+1] = { a[first_match], a[#a] }
end
return table.concat(map(result, function(e)
if type(e)=='table' then
return string.format("[%s..%s]",
tostring(e[1]),
tostring(e[2]))
else
return tostring(e)
end
end),
',')
end
return {
map = map,
summarize = summarize
}
end
$$;
do language pllua $$
local u = require 'myutil'
for r in spi.rows([[ select a, b,
array_append(a, -1) as xa,
array_append(b, 'wombat') as xb
from adata
where a is not null or b is not null
order by id ]])
do
print(u.summarize(r.a),u.summarize(r.b))
print(u.summarize(r.xa),u.summarize(r.xb))
end
for r in spi.rows([[ select c,
array_append(c, -1.0) as xc
from adata
where c is not null
order by id ]])
do
print(u.summarize(r.c))
print(u.summarize(r.xc))
end
for r in spi.rows([[ select d
from adata
where d is not null
order by id ]])
do
print(r.d)
end
$$;
INFO: [1..2] nil
INFO: [1..2],-1 wombat
INFO: 10,20,30,40,50 nil
INFO: 10,20,30,40,50,-1 wombat
INFO: [1..100] nil
INFO: [1..100],-1 wombat
INFO: [1..100000] nil
INFO: [1..100000],-1 wombat
INFO: nil
INFO: -1 wombat
INFO: nil
INFO: -1 wombat
INFO: nil foo,bar,baz
INFO: -1 foo,bar,baz,wombat
INFO: nil [val1..val100]
INFO: -1 [val1..val100],wombat
INFO: nil [val1..val10000]
INFO: -1 [val1..val10000],wombat
INFO:
INFO: -1.0
INFO: 1.234,2.718281828459045235360287471353,10888869450418352160768000000
INFO: 1.234,2.718281828459045235360287471353,10888869450418352160768000000,-1.0
INFO: [1..100]
INFO: [1..100],-1.0
INFO: [1..10000]
INFO: [1..10000],-1.0
INFO: {}
INFO: {12-11-2017,05-10-1968,09-26-1983,10-27-1962}
INFO: {01-01-2017,01-19-2017,02-06-2017,02-24-2017,03-14-2017,04-01-2017,04-19-2017,05-07-2017,05-25-2017,06-12-2017,06-30-2017,07-18-2017,08-05-2017,08-23-2017,09-10-2017,09-28-2017,10-16-2017,11-03-2017,11-21-2017,12-09-2017,12-27-2017}
create function af1(a anyarray)
returns text
language pllua
stable
as $$
return tostring(u.summarize(a))
end
u = require 'myutil'
do
$$;
-- array_append returns its result as an expanded datum
select af1(a) from adata where a is not null order by id;
af1
----------------
[1..2]
10,20,30,40,50
[1..100]
[1..100000]
(5 rows)
with t as (select a from adata where a is not null order by id)
select af1(array_append(a, -1)) from t;
af1
-------------------
[1..2],-1
10,20,30,40,50,-1
[1..100],-1
[1..100000],-1
-1
(5 rows)
select af1(b) from adata where b is not null order by id;
af1
------------------
foo,bar,baz
[val1..val100]
[val1..val10000]
(4 rows)
with t as (select b from adata where b is not null order by id)
select af1(array_append(b, 'wombat')) from t;
af1
-------------------------
wombat
foo,bar,baz,wombat
[val1..val100],wombat
[val1..val10000],wombat
(4 rows)
select af1(c) from adata where c is not null order by id;
af1
----------------------------------------------------------------------
1.234,2.718281828459045235360287471353,10888869450418352160768000000
[1..100]
[1..10000]
(4 rows)
with t as (select c from adata where c is not null order by id)
select af1(array_append(c, -1.0)) from t;
af1
---------------------------------------------------------------------------
-1.0
1.234,2.718281828459045235360287471353,10888869450418352160768000000,-1.0
[1..100],-1.0
[1..10000],-1.0
(4 rows)
select af1(d) from adata where d is not null order by id;
af1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
12-11-2017,05-10-1968,09-26-1983,10-27-1962
01-01-2017,01-19-2017,02-06-2017,02-24-2017,03-14-2017,04-01-2017,04-19-2017,05-07-2017,05-25-2017,06-12-2017,06-30-2017,07-18-2017,08-05-2017,08-23-2017,09-10-2017,09-28-2017,10-16-2017,11-03-2017,11-21-2017,12-09-2017,12-27-2017
(3 rows)
with t as (select d from adata where d is not null order by id)
select af1(array_append(d, date '1970-01-01')) from t;
af1
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
01-01-1970
12-11-2017,05-10-1968,09-26-1983,10-27-1962,01-01-1970
01-01-2017,01-19-2017,02-06-2017,02-24-2017,03-14-2017,04-01-2017,04-19-2017,05-07-2017,05-25-2017,06-12-2017,06-30-2017,07-18-2017,08-05-2017,08-23-2017,09-10-2017,09-28-2017,10-16-2017,11-03-2017,11-21-2017,12-09-2017,12-27-2017,01-01-1970
(3 rows)
-- conversion edge cases
create function pg_temp.af2() returns integer[] language pllua
as $$
return nil
$$;
select pg_temp.af2();
af2
-----
(1 row)
create function pg_temp.af3() returns integer[] language pllua
as $$
return
$$;
select pg_temp.af3();
af3
-----
(1 row)
create function pg_temp.af4() returns integer[] language pllua
as $$
return 1,2
$$;
select pg_temp.af4();
af4
-------
{1,2}
(1 row)
create function pg_temp.af5() returns integer[] language pllua
as $$
return pgtype(nil,0)()
$$;
select pg_temp.af5();
af5
-----
{}
(1 row)
create function pg_temp.af5b() returns integer[] language pllua
as $$
return {}
$$;
select pg_temp.af5b();
af5b
------
{}
(1 row)
create function pg_temp.af6() returns integer[] language pllua
as $$
return { 1, nil, 3 }
$$;
select pg_temp.af6();
af6
------------
{1,NULL,3}
(1 row)
create function pg_temp.af7() returns integer[] language pllua
as $$
return pgtype.integer(1)
$$;
select pg_temp.af7();
af7
-----
{1}
(1 row)
create function pg_temp.af8() returns integer[] language pllua
as $$
return { pgtype.integer(1) }
$$;
select pg_temp.af8();
af8
-----
{1}
(1 row)
create type acomp1 as (foo integer, bar text);
create function pg_temp.af9() returns acomp1[] language pllua
as $$
return { { foo = 1, bar = "zot" } }
$$;
select pg_temp.af9();
af9
-------------
{"(1,zot)"}
(1 row)
create function pg_temp.af10() returns acomp1[] language pllua
as $$
return { pgtype(nil,0):element()(1, "zot") }
$$;
select pg_temp.af10();
af10
-------------
{"(1,zot)"}
(1 row)
--
|
