When a row fails a not-null constraint, show row's contents in errdetail.

Simple extension of previous patch for CHECK constraints.

src/backend/executor/execMain.c

@@ -1576,7 +1576,9 @@ ExecConstraints(ResultRelInfo *resultRelInfo,
 				ereport(ERROR,
 						(errcode(ERRCODE_NOT_NULL_VIOLATION),
 						 errmsg("null value in column \"%s\" violates not-null constraint",
-						NameStr(rel->rd_att->attrs[attrChk - 1]->attname))));
+						NameStr(rel->rd_att->attrs[attrChk - 1]->attname)),
+						 errdetail("Failing row contains %s.",
+								   ExecBuildSlotValueDescription(slot, 64))));
 		}
 	}
 

src/test/regress/expected/alter_table.out

@@ -599,6 +599,7 @@ insert into atacc1 (test) values (4);
 -- inserting NULL should fail
 insert into atacc1 (test) values(NULL);
 ERROR:  null value in column "test" violates not-null constraint
+DETAIL:  Failing row contains (null).
 -- try adding a second primary key (should fail)
 alter table atacc1 add constraint atacc_oid1 primary key(oid);
 ERROR:  multiple primary keys for table "atacc1" are not allowed
@@ -664,10 +665,13 @@ ERROR:  duplicate key value violates unique constraint "atacc_test1"
 DETAIL:  Key (test, test2)=(4, 4) already exists.
 insert into atacc1 (test,test2) values (NULL,3);
 ERROR:  null value in column "test" violates not-null constraint
+DETAIL:  Failing row contains (null, 3).
 insert into atacc1 (test,test2) values (3, NULL);
 ERROR:  null value in column "test2" violates not-null constraint
+DETAIL:  Failing row contains (3, null).
 insert into atacc1 (test,test2) values (NULL,NULL);
 ERROR:  null value in column "test" violates not-null constraint
+DETAIL:  Failing row contains (null, null).
 -- should all succeed
 insert into atacc1 (test,test2) values (4,5);
 insert into atacc1 (test,test2) values (5,4);
@@ -683,6 +687,7 @@ ERROR:  duplicate key value violates unique constraint "atacc1_pkey"
 DETAIL:  Key (test)=(3) already exists.
 insert into atacc1 (test2, test) values (1, NULL);
 ERROR:  null value in column "test" violates not-null constraint
+DETAIL:  Failing row contains (null, 1).
 drop table atacc1;
 -- alter table / alter column [set/drop] not null tests
 -- try altering system catalogs, should fail
@@ -733,8 +738,10 @@ create table child (b varchar(255)) inherits (parent);
 alter table parent alter a set not null;
 insert into parent values (NULL);
 ERROR:  null value in column "a" violates not-null constraint
+DETAIL:  Failing row contains (null).
 insert into child (a, b) values (NULL, 'foo');
 ERROR:  null value in column "a" violates not-null constraint
+DETAIL:  Failing row contains (null, foo).
 alter table parent alter a drop not null;
 insert into parent values (NULL);
 insert into child (a, b) values (NULL, 'foo');
@@ -746,13 +753,16 @@ delete from parent;
 alter table only parent alter a set not null;
 insert into parent values (NULL);
 ERROR:  null value in column "a" violates not-null constraint
+DETAIL:  Failing row contains (null).
 alter table child alter a set not null;
 insert into child (a, b) values (NULL, 'foo');
 ERROR:  null value in column "a" violates not-null constraint
+DETAIL:  Failing row contains (null, foo).
 delete from child;
 alter table child alter a set not null;
 insert into child (a, b) values (NULL, 'foo');
 ERROR:  null value in column "a" violates not-null constraint
+DETAIL:  Failing row contains (null, foo).
 drop table child;
 drop table parent;
 -- test setting and removing default values

src/test/regress/expected/domain.out

@@ -206,10 +206,12 @@ INSERT INTO nulltest values ('a', NULL, 'c', 'd', 'c');
 ERROR:  domain dnotnull does not allow null values
 INSERT INTO nulltest values ('a', 'b', NULL, 'd', 'c');
 ERROR:  null value in column "col3" violates not-null constraint
+DETAIL:  Failing row contains (a, b, null, d, c).
 INSERT INTO nulltest values ('a', 'b', 'c', NULL, 'd'); -- Good
 -- Test copy
 COPY nulltest FROM stdin; --fail
 ERROR:  null value in column "col3" violates not-null constraint
+DETAIL:  Failing row contains (a, b, null, d, d).
 CONTEXT:  COPY nulltest, line 1: "a	b	\N	d	d"
 COPY nulltest FROM stdin; --fail
 ERROR:  domain dcheck does not allow null values
@@ -264,12 +266,14 @@ create table defaulttest
 NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "defaulttest_pkey" for table "defaulttest"
 insert into defaulttest(col4) values(0); -- fails, col5 defaults to null
 ERROR:  null value in column "col5" violates not-null constraint
+DETAIL:  Failing row contains (3, 12, 5, 0, null, 88, 8000, 12.12).
 alter table defaulttest alter column col5 drop default;
 insert into defaulttest default values; -- succeeds, inserts domain default
 -- We used to treat SET DEFAULT NULL as equivalent to DROP DEFAULT; wrong
 alter table defaulttest alter column col5 set default null;
 insert into defaulttest(col4) values(0); -- fails
 ERROR:  null value in column "col5" violates not-null constraint
+DETAIL:  Failing row contains (3, 12, 5, 0, null, 88, 8000, 12.12).
 alter table defaulttest alter column col5 drop default;
 insert into defaulttest default values;
 insert into defaulttest default values;

src/test/regress/expected/inherit.out

@@ -539,6 +539,7 @@ CREATE TEMP TABLE z (b TEXT, PRIMARY KEY(aa, b)) inherits (a);
 NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "z_pkey" for table "z"
 INSERT INTO z VALUES (NULL, 'text'); -- should fail
 ERROR:  null value in column "aa" violates not-null constraint
+DETAIL:  Failing row contains (null, text).
 -- Check UPDATE with inherited target and an inherited source table
 create temp table foo(f1 int, f2 int);
 create temp table foo2(f3 int) inherits (foo);

src/test/regress/expected/insert.out

@@ -4,6 +4,7 @@
 create table inserttest (col1 int4, col2 int4 NOT NULL, col3 text default 'testing');
 insert into inserttest (col1, col2, col3) values (DEFAULT, DEFAULT, DEFAULT);
 ERROR:  null value in column "col2" violates not-null constraint
+DETAIL:  Failing row contains (null, null, testing).
 insert into inserttest (col2, col3) values (3, DEFAULT);
 insert into inserttest (col1, col2, col3) values (DEFAULT, 5, DEFAULT);
 insert into inserttest values (DEFAULT, 5, 'test');

src/test/regress/expected/sequence.out

@@ -8,6 +8,7 @@ INSERT INTO serialTest VALUES ('bar');
 INSERT INTO serialTest VALUES ('force', 100);
 INSERT INTO serialTest VALUES ('wrong', NULL);
 ERROR:  null value in column "f2" violates not-null constraint
+DETAIL:  Failing row contains (wrong, null).
 SELECT * FROM serialTest;
   f1   | f2  
 -------+-----

src/test/regress/expected/sequence_1.out

@@ -8,6 +8,7 @@ INSERT INTO serialTest VALUES ('bar');
 INSERT INTO serialTest VALUES ('force', 100);
 INSERT INTO serialTest VALUES ('wrong', NULL);
 ERROR:  null value in column "f2" violates not-null constraint
+DETAIL:  Failing row contains (wrong, null).
 SELECT * FROM serialTest;
   f1   | f2  
 -------+-----

src/test/regress/output/constraints.source

@@ -320,6 +320,7 @@ INSERT INTO PRIMARY_TBL VALUES (4, 'three');
 INSERT INTO PRIMARY_TBL VALUES (5, 'one');
 INSERT INTO PRIMARY_TBL (t) VALUES ('six');
 ERROR:  null value in column "i" violates not-null constraint
+DETAIL:  Failing row contains (null, six).
 SELECT '' AS four, * FROM PRIMARY_TBL;
  four | i |   t   
 ------+---+-------
@@ -340,6 +341,7 @@ INSERT INTO PRIMARY_TBL VALUES (4, 'three');
 INSERT INTO PRIMARY_TBL VALUES (5, 'one');
 INSERT INTO PRIMARY_TBL (t) VALUES ('six');
 ERROR:  null value in column "i" violates not-null constraint
+DETAIL:  Failing row contains (null, six).
 SELECT '' AS three, * FROM PRIMARY_TBL;
  three | i |   t   
 -------+---+-------