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Generated columns

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This is an SQL-standard feature that allows creating columns that are
computed from expressions rather than assigned, similar to a view or
materialized view but on a column basis.

This implements one kind of generated column: stored (computed on
write).  Another kind, virtual (computed on read), is planned for the
future, and some room is left for it.

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-03-30 08:13:09 +01:00
parent 6b8b5364dd
commit fc22b6623b
84 changed files with 3067 additions and 157 deletions
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14
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -1363,6 +1363,20 @@ insert into rem1(f2) values('bye remote');
select * from loc1;
select * from rem1;
-- ===================================================================
-- test generated columns
-- ===================================================================
create table gloc1 (a int, b int);
alter table gloc1 set (autovacuum_enabled = 'false');
create foreign table grem1 (
a int,
b int generated always as (a * 2) stored)
server loopback options(table_name 'gloc1');
insert into grem1 (a) values (1), (2);
update grem1 set a = 22 where a = 2;
select * from gloc1;
select * from grem1;
-- ===================================================================
-- test local triggers
-- ===================================================================