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Support arrays as input to array_agg() and ARRAY(SELECT ...).

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These cases formerly failed with errors about "could not find array type
for data type".  Now they yield arrays of the same element type and one
higher dimension.

The implementation involves creating functions with API similar to the
existing accumArrayResult() family.  I (tgl) also extended the base family
by adding an initArrayResult() function, which allows callers to avoid
special-casing the zero-inputs case if they just want an empty array as
result.  (Not all do, so the previous calling convention remains valid.)
This allowed simplifying some existing code in xml.c and plperl.c.

Ali Akbar, reviewed by Pavel Stehule, significantly modified by me
This commit is contained in:
Tom Lane
2014-11-25 12:21:22 -05:00
parent 25976710df
commit bac27394a1
18 changed files with 797 additions and 115 deletions
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22
src/test/regress/sql/arrays.sql
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@ -427,11 +427,29 @@ select cardinality('{{1,2}}'::int[]);
select cardinality('{{1,2},{3,4},{5,6}}'::int[]);
select cardinality('{{{1,9},{5,6}},{{2,3},{3,4}}}'::int[]);
-- array_agg(anynonarray)
select array_agg(unique1) from (select unique1 from tenk1 where unique1 < 15 order by unique1) ss;
select array_agg(ten) from (select ten from tenk1 where unique1 < 15 order by unique1) ss;
select array_agg(nullif(ten, 4)) from (select ten from tenk1 where unique1 < 15 order by unique1) ss;
select array_agg(unique1) from tenk1 where unique1 < -15;
-- array_agg(anyarray)
select array_agg(ar)
from (values ('{1,2}'::int[]), ('{3,4}'::int[])) v(ar);
select array_agg(distinct ar order by ar desc)
from (select array[i / 2] from generate_series(1,10) a(i)) b(ar);
select array_agg(ar)
from (select array_agg(array[i, i+1, i-1])
from generate_series(1,2) a(i)) b(ar);
select array_agg(array[i+1.2, i+1.3, i+1.4]) from generate_series(1,3) g(i);
select array_agg(array['Hello', i::text]) from generate_series(9,11) g(i);
select array_agg(array[i, nullif(i, 3), i+1]) from generate_series(1,4) g(i);
-- errors
select array_agg('{}'::int[]) from generate_series(1,2);
select array_agg(null::int[]) from generate_series(1,2);
select array_agg(ar)
from (values ('{1,2}'::int[]), ('{3}'::int[])) v(ar);
select unnest(array[1,2,3]);
select * from unnest(array[1,2,3]);
select unnest(array[1,2,3,4.5]::float8[]);
@ -452,6 +470,10 @@ select array_replace(array['A','B','DD','B'],'B','CC');
select array_replace(array[1,NULL,3],NULL,NULL);
select array_replace(array['AB',NULL,'CDE'],NULL,'12');
-- array(select array-value ...)
select array(select array[i,i/2] from generate_series(1,5) i);
select array(select array['Hello', i::text] from generate_series(9,11) i);
-- Insert/update on a column that is array of composite
create temp table t1 (f1 int8_tbl[]);