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Allow assignment to array elements not contiguous with those already

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present; intervening positions are filled with nulls.  This behavior
is required by SQL99 but was not implementable before 8.2 due to lack
of support for nulls in arrays.  I have only made it work for the
one-dimensional case, which is all that SQL99 requires.  It seems quite
complex to get it right in higher dimensions, and since we never allowed
extension at all in higher dimensions, I think that must count as a
future feature addition not a bug fix.
This commit is contained in:
Tom Lane
2006-09-29 21:22:21 +00:00
parent 673a573dcc
commit 352a56ba68
4 changed files with 269 additions and 93 deletions
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110
src/test/regress/expected/arrays.out
View File

@ -143,6 +143,116 @@ SELECT a,b,c FROM arrtest;
[4:4]={NULL} | {3,4} | {foo,new_word}
(3 rows)
--
-- test array extension
--
CREATE TEMP TABLE arrtest1 (i int[], t text[]);
insert into arrtest1 values(array[1,2,null,4], array['one','two',null,'four']);
select * from arrtest1;
i | t
--------------+---------------------
{1,2,NULL,4} | {one,two,NULL,four}
(1 row)
update arrtest1 set i[2] = 22, t[2] = 'twenty-two';
select * from arrtest1;
i | t
---------------+----------------------------
{1,22,NULL,4} | {one,twenty-two,NULL,four}
(1 row)
update arrtest1 set i[5] = 5, t[5] = 'five';
select * from arrtest1;
i | t
-----------------+---------------------------------
{1,22,NULL,4,5} | {one,twenty-two,NULL,four,five}
(1 row)
update arrtest1 set i[8] = 8, t[8] = 'eight';
select * from arrtest1;
i | t
-----------------------------+-------------------------------------------------
{1,22,NULL,4,5,NULL,NULL,8} | {one,twenty-two,NULL,four,five,NULL,NULL,eight}
(1 row)
update arrtest1 set i[0] = 0, t[0] = 'zero';
select * from arrtest1;
i | t
-------------------------------------+------------------------------------------------------------
[0:8]={0,1,22,NULL,4,5,NULL,NULL,8} | [0:8]={zero,one,twenty-two,NULL,four,five,NULL,NULL,eight}
(1 row)
update arrtest1 set i[-3] = -3, t[-3] = 'minus-three';
select * from arrtest1;
i | t
---------------------------------------------------+-----------------------------------------------------------------------------------
[-3:8]={-3,NULL,NULL,0,1,22,NULL,4,5,NULL,NULL,8} | [-3:8]={minus-three,NULL,NULL,zero,one,twenty-two,NULL,four,five,NULL,NULL,eight}
(1 row)
update arrtest1 set i[0:2] = array[10,11,12], t[0:2] = array['ten','eleven','twelve'];
select * from arrtest1;
i | t
-----------------------------------------------------+---------------------------------------------------------------------------------
[-3:8]={-3,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,8} | [-3:8]={minus-three,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,eight}
(1 row)
update arrtest1 set i[8:10] = array[18,null,20], t[8:10] = array['p18',null,'p20'];
select * from arrtest1;
i | t
---------------------------------------------------------------+-----------------------------------------------------------------------------------------
[-3:10]={-3,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,18,NULL,20} | [-3:10]={minus-three,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,p18,NULL,p20}
(1 row)
update arrtest1 set i[11:12] = array[null,22], t[11:12] = array[null,'p22'];
select * from arrtest1;
i | t
-----------------------------------------------------------------------+--------------------------------------------------------------------------------------------------
[-3:12]={-3,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,18,NULL,20,NULL,22} | [-3:12]={minus-three,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,p18,NULL,p20,NULL,p22}
(1 row)
update arrtest1 set i[15:16] = array[null,26], t[15:16] = array[null,'p26'];
select * from arrtest1;
i | t
-----------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------
[-3:16]={-3,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,18,NULL,20,NULL,22,NULL,NULL,NULL,26} | [-3:16]={minus-three,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,p18,NULL,p20,NULL,p22,NULL,NULL,NULL,p26}
(1 row)
update arrtest1 set i[-5:-3] = array[-15,-14,-13], t[-5:-3] = array['m15','m14','m13'];
select * from arrtest1;
i | t
--------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------
[-5:16]={-15,-14,-13,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,18,NULL,20,NULL,22,NULL,NULL,NULL,26} | [-5:16]={m15,m14,m13,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,p18,NULL,p20,NULL,p22,NULL,NULL,NULL,p26}
(1 row)
update arrtest1 set i[-7:-6] = array[-17,null], t[-7:-6] = array['m17',null];
select * from arrtest1;
i | t
-----------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------
[-7:16]={-17,NULL,-15,-14,-13,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,18,NULL,20,NULL,22,NULL,NULL,NULL,26} | [-7:16]={m17,NULL,m15,m14,m13,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,p18,NULL,p20,NULL,p22,NULL,NULL,NULL,p26}
(1 row)
update arrtest1 set i[-12:-10] = array[-22,null,-20], t[-12:-10] = array['m22',null,'m20'];
select * from arrtest1;
i | t
-----------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------
[-12:16]={-22,NULL,-20,NULL,NULL,-17,NULL,-15,-14,-13,NULL,NULL,10,11,12,NULL,4,5,NULL,NULL,18,NULL,20,NULL,22,NULL,NULL,NULL,26} | [-12:16]={m22,NULL,m20,NULL,NULL,m17,NULL,m15,m14,m13,NULL,NULL,ten,eleven,twelve,NULL,four,five,NULL,NULL,p18,NULL,p20,NULL,p22,NULL,NULL,NULL,p26}
(1 row)
delete from arrtest1;
insert into arrtest1 values(array[1,2,null,4], array['one','two',null,'four']);
select * from arrtest1;
i | t
--------------+---------------------
{1,2,NULL,4} | {one,two,NULL,four}
(1 row)
update arrtest1 set i[0:5] = array[0,1,2,null,4,5], t[0:5] = array['z','p1','p2',null,'p4','p5'];
select * from arrtest1;
i | t
------------------------+----------------------------
[0:5]={0,1,2,NULL,4,5} | [0:5]={z,p1,p2,NULL,p4,p5}
(1 row)
--
-- array expressions and operators
--

36
src/test/regress/sql/arrays.sql
View File

@ -90,6 +90,42 @@ SELECT a FROM arrtest WHERE a[2] IS NULL;
DELETE FROM arrtest WHERE a[2] IS NULL AND b IS NULL;
SELECT a,b,c FROM arrtest;
--
-- test array extension
--
CREATE TEMP TABLE arrtest1 (i int[], t text[]);
insert into arrtest1 values(array[1,2,null,4], array['one','two',null,'four']);
select * from arrtest1;
update arrtest1 set i[2] = 22, t[2] = 'twenty-two';
select * from arrtest1;
update arrtest1 set i[5] = 5, t[5] = 'five';
select * from arrtest1;
update arrtest1 set i[8] = 8, t[8] = 'eight';
select * from arrtest1;
update arrtest1 set i[0] = 0, t[0] = 'zero';
select * from arrtest1;
update arrtest1 set i[-3] = -3, t[-3] = 'minus-three';
select * from arrtest1;
update arrtest1 set i[0:2] = array[10,11,12], t[0:2] = array['ten','eleven','twelve'];
select * from arrtest1;
update arrtest1 set i[8:10] = array[18,null,20], t[8:10] = array['p18',null,'p20'];
select * from arrtest1;
update arrtest1 set i[11:12] = array[null,22], t[11:12] = array[null,'p22'];
select * from arrtest1;
update arrtest1 set i[15:16] = array[null,26], t[15:16] = array[null,'p26'];
select * from arrtest1;
update arrtest1 set i[-5:-3] = array[-15,-14,-13], t[-5:-3] = array['m15','m14','m13'];
select * from arrtest1;
update arrtest1 set i[-7:-6] = array[-17,null], t[-7:-6] = array['m17',null];
select * from arrtest1;
update arrtest1 set i[-12:-10] = array[-22,null,-20], t[-12:-10] = array['m22',null,'m20'];
select * from arrtest1;
delete from arrtest1;
insert into arrtest1 values(array[1,2,null,4], array['one','two',null,'four']);
select * from arrtest1;
update arrtest1 set i[0:5] = array[0,1,2,null,4,5], t[0:5] = array['z','p1','p2',null,'p4','p5'];
select * from arrtest1;
--
-- array expressions and operators
--