Fix ALTER TABLE ADD COLUMN ... PRIMARY KEY so that the new column is correctly

checked to see if it's been initialized to all non-nulls.  The implicit NOT
NULL constraint was not being checked during the ALTER (in fact, not even if
there was an explicit NOT NULL too), because ATExecAddColumn neglected to
set the flag needed to make the test happen.  This has been broken since
the capability was first added, in 8.0.

Brendan Jurd, per a report from Kaloyan Iliev.

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index b507f17b7b65505edc513cee53bb4540e9ee9ed1..9d6939bbc11d1547622b311c2de806c2219b363e 100644 (file)
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.250 2008/03/31 03:34:27 tgl Exp $
+ *       $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.251 2008/04/24 20:17:50 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3332,6 +3332,11 @@ ATExecAddColumn(AlteredTableInfo *tab, Relation rel,
                tab->newvals = lappend(tab->newvals, newval);
        }
 
+       /*
+        * If the new column is NOT NULL, tell Phase 3 it needs to test that.
+        */
+       tab->new_notnull |= colDef->is_not_null;
+
        /*
         * Add needed dependency entries for the new column.
         */

diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index cba489d1d8643f5410ae26f39148463f14ae66ab..51d5afa81fd9a771576c2e42e27a7c77db3c071d 100644 (file)
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -505,6 +505,18 @@ create table atacc1 ( test int );
 alter table atacc1 add constraint atacc_test1 primary key (test1);
 ERROR:  column "test1" named in key does not exist
 drop table atacc1;
+-- adding a new column as primary key to a non-empty table.
+-- should fail unless the column has a non-null default value.
+create table atacc1 ( test int );
+insert into atacc1 (test) values (0);
+-- add a primary key column without a default (fails).
+alter table atacc1 add column test2 int primary key;
+NOTICE:  ALTER TABLE / ADD PRIMARY KEY will create implicit index "atacc1_pkey" for table "atacc1"
+ERROR:  column "test2" contains null values
+-- now add a primary key column with a default (succeeds).
+alter table atacc1 add column test2 int default 0 primary key;
+NOTICE:  ALTER TABLE / ADD PRIMARY KEY will create implicit index "atacc1_pkey" for table "atacc1"
+drop table atacc1;
 -- something a little more complicated
 create table atacc1 ( test int, test2 int);
 -- add a primary key constraint

diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index d52d6c822e242e0de41d740cfbc9e94973560697..81cc70612d5ae5194edbf16413ec761aa2b2d713 100644 (file)
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -506,6 +506,16 @@ create table atacc1 ( test int );
 alter table atacc1 add constraint atacc_test1 primary key (test1);
 drop table atacc1;
 
+-- adding a new column as primary key to a non-empty table.
+-- should fail unless the column has a non-null default value.
+create table atacc1 ( test int );
+insert into atacc1 (test) values (0);
+-- add a primary key column without a default (fails).
+alter table atacc1 add column test2 int primary key;
+-- now add a primary key column with a default (succeeds).
+alter table atacc1 add column test2 int default 0 primary key;
+drop table atacc1;
+
 -- something a little more complicated
 create table atacc1 ( test int, test2 int);
 -- add a primary key constraint