Improve unique-constraint-violation error messages to include the exact

values being complained of.

In passing, also remove the arbitrary length limitation in the similar
error detail message for foreign key violations.

Itagaki Takahiro

contrib/citext/expected/citext.out

@@ -271,10 +271,13 @@ SELECT name, 'A' = name AS t      FROM try where name = 'A';
 -- expected failures on duplicate key
 INSERT INTO try (name) VALUES ('a');
 ERROR:  duplicate key value violates unique constraint "try_pkey"
+DETAIL:  Key (name)=(a) already exists.
 INSERT INTO try (name) VALUES ('A');
 ERROR:  duplicate key value violates unique constraint "try_pkey"
+DETAIL:  Key (name)=(A) already exists.
 INSERT INTO try (name) VALUES ('aB');
 ERROR:  duplicate key value violates unique constraint "try_pkey"
+DETAIL:  Key (name)=(aB) already exists.
 -- Make sure that citext_smaller() and citext_lager() work properly.
 SELECT citext_smaller( 'aa'::citext, 'ab'::citext ) = 'aa' AS t;
  t 

contrib/citext/expected/citext_1.out

@@ -271,10 +271,13 @@ SELECT name, 'A' = name AS t      FROM try where name = 'A';
 -- expected failures on duplicate key
 INSERT INTO try (name) VALUES ('a');
 ERROR:  duplicate key value violates unique constraint "try_pkey"
+DETAIL:  Key (name)=(a) already exists.
 INSERT INTO try (name) VALUES ('A');
 ERROR:  duplicate key value violates unique constraint "try_pkey"
+DETAIL:  Key (name)=(A) already exists.
 INSERT INTO try (name) VALUES ('aB');
 ERROR:  duplicate key value violates unique constraint "try_pkey"
+DETAIL:  Key (name)=(aB) already exists.
 -- Make sure that citext_smaller() and citext_lager() work properly.
 SELECT citext_smaller( 'aa'::citext, 'ab'::citext ) = 'aa' AS t;
  t 

src/backend/access/common/indextuple.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/common/indextuple.c,v 1.88 2009/06/11 14:48:53 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/common/indextuple.c,v 1.89 2009/08/01 19:59:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -432,6 +432,27 @@ nocache_index_getattr(IndexTuple tup,
 	return fetchatt(att[attnum], tp + off);
 }
 
+/*
+ * Convert an index tuple into Datum/isnull arrays.
+ *
+ * The caller must allocate sufficient storage for the output arrays.
+ * (INDEX_MAX_KEYS entries should be enough.)
+ */
+void
+index_deform_tuple(IndexTuple tup, TupleDesc tupleDescriptor,
+				   Datum *values, bool *isnull)
+{
+	int			i;
+
+	/* Assert to protect callers who allocate fixed-size arrays */
+	Assert(tupleDescriptor->natts <= INDEX_MAX_KEYS);
+
+	for (i = 0; i < tupleDescriptor->natts; i++)
+	{
+		values[i] = index_getattr(tup, i + 1, tupleDescriptor, &isnull[i]);
+	}
+}
+
 /*
  * Create a palloc'd copy of an index tuple.
  */

src/backend/access/index/genam.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.74 2009/06/11 14:48:54 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.75 2009/08/01 19:59:41 tgl Exp $
  *
  * NOTES
  *	  many of the old access method routines have been turned into
@@ -24,6 +24,8 @@
 #include "miscadmin.h"
 #include "pgstat.h"
 #include "storage/bufmgr.h"
+#include "utils/builtins.h"
+#include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/tqual.h"
 
@@ -130,6 +132,59 @@ IndexScanEnd(IndexScanDesc scan)
 	pfree(scan);
 }
 
+/*
+ * ReportUniqueViolation -- Report a unique-constraint violation.
+ *
+ * The index entry represented by values[]/isnull[] violates the unique
+ * constraint enforced by this index.  Throw a suitable error.
+ */
+void
+ReportUniqueViolation(Relation indexRelation, Datum *values, bool *isnull)
+{
+	/*
+	 * XXX for the moment we use the index's tupdesc as a guide to the
+	 * datatypes of the values.  This is okay for btree indexes but is in
+	 * fact the wrong thing in general.  This will have to be fixed if we
+	 * are ever to support non-btree unique indexes.
+	 */
+	TupleDesc	tupdesc = RelationGetDescr(indexRelation);
+	char	   *key_names;
+	StringInfoData key_values;
+	int			i;
+
+	key_names = pg_get_indexdef_columns(RelationGetRelid(indexRelation), true);
+
+	/* Get printable versions of the key values */
+	initStringInfo(&key_values);
+	for (i = 0; i < tupdesc->natts; i++)
+	{
+		char   *val;
+
+		if (isnull[i])
+			val = "null";
+		else
+		{
+			Oid		foutoid;
+			bool	typisvarlena;
+
+			getTypeOutputInfo(tupdesc->attrs[i]->atttypid,
+							  &foutoid, &typisvarlena);
+			val = OidOutputFunctionCall(foutoid, values[i]);
+		}
+
+		if (i > 0)
+			appendStringInfoString(&key_values, ", ");
+		appendStringInfoString(&key_values, val);
+	}
+
+	ereport(ERROR,
+			(errcode(ERRCODE_UNIQUE_VIOLATION),
+			 errmsg("duplicate key value violates unique constraint \"%s\"",
+					RelationGetRelationName(indexRelation)),
+			 errdetail("Key (%s)=(%s) already exists.",
+					   key_names, key_values.data)));
+}
+
 
 /* ----------------------------------------------------------------
  *		heap-or-index-scan access to system catalogs

src/backend/access/nbtree/nbtinsert.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.171 2009/07/29 20:56:18 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/nbtree/nbtinsert.c,v 1.172 2009/08/01 19:59:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -362,12 +362,25 @@ _bt_check_unique(Relation rel, IndexTuple itup, Relation heapRel,
 					}
 
 					/*
-					 * This is a definite conflict.
+					 * This is a definite conflict.  Break the tuple down
+					 * into datums and report the error.  But first, make
+					 * sure we release the buffer locks we're holding ---
+					 * the error reporting code could make catalog accesses,
+					 * which in the worst case might touch this same index
+					 * and cause deadlocks.
 					 */
-					ereport(ERROR,
-							(errcode(ERRCODE_UNIQUE_VIOLATION),
-							 errmsg("duplicate key value violates unique constraint \"%s\"",
-									RelationGetRelationName(rel))));
+					if (nbuf != InvalidBuffer)
+						_bt_relbuf(rel, nbuf);
+					_bt_relbuf(rel, buf);
+
+					{
+						Datum	values[INDEX_MAX_KEYS];
+						bool	isnull[INDEX_MAX_KEYS];
+
+						index_deform_tuple(itup, RelationGetDescr(rel),
+										   values, isnull);
+						ReportUniqueViolation(rel, values, isnull);
+					}
 				}
 				else if (all_dead)
 				{

src/backend/utils/adt/ri_triggers.c

@@ -15,7 +15,7 @@
  *
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.113 2009/06/11 14:49:04 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.114 2009/08/01 19:59:41 tgl Exp $
  *
  * ----------
  */
@@ -3413,11 +3413,8 @@ ri_ReportViolation(RI_QueryKey *qkey, const char *constrname,
 				   HeapTuple violator, TupleDesc tupdesc,
 				   bool spi_err)
 {
-#define BUFLENGTH	512
-	char		key_names[BUFLENGTH];
-	char		key_values[BUFLENGTH];
-	char	   *name_ptr = key_names;
-	char	   *val_ptr = key_values;
+	StringInfoData key_names;
+	StringInfoData key_values;
 	bool		onfk;
 	int			idx,
 				key_idx;
@@ -3465,6 +3462,8 @@ ri_ReportViolation(RI_QueryKey *qkey, const char *constrname,
 	}
 
 	/* Get printable versions of the keys involved */
+	initStringInfo(&key_names);
+	initStringInfo(&key_values);
 	for (idx = 0; idx < qkey->nkeypairs; idx++)
 	{
 		int			fnum = qkey->keypair[idx][key_idx];
@@ -3476,20 +3475,13 @@ ri_ReportViolation(RI_QueryKey *qkey, const char *constrname,
 		if (!val)
 			val = "null";
 
-		/*
-		 * Go to "..." if name or value doesn't fit in buffer.  We reserve 5
-		 * bytes to ensure we can add comma, "...", null.
-		 */
-		if (strlen(name) >= (key_names + BUFLENGTH - 5) - name_ptr ||
-			strlen(val) >= (key_values + BUFLENGTH - 5) - val_ptr)
+		if (idx > 0)
 		{
-			sprintf(name_ptr, "...");
-			sprintf(val_ptr, "...");
-			break;
+			appendStringInfoString(&key_names, ", ");
+			appendStringInfoString(&key_values, ", ");
 		}
-
-		name_ptr += sprintf(name_ptr, "%s%s", idx > 0 ? "," : "", name);
-		val_ptr += sprintf(val_ptr, "%s%s", idx > 0 ? "," : "", val);
+		appendStringInfoString(&key_names, name);
+		appendStringInfoString(&key_values, val);
 	}
 
 	if (onfk)
@@ -3498,7 +3490,7 @@ ri_ReportViolation(RI_QueryKey *qkey, const char *constrname,
 				 errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
 						RelationGetRelationName(fk_rel), constrname),
 				 errdetail("Key (%s)=(%s) is not present in table \"%s\".",
-						   key_names, key_values,
+						   key_names.data, key_values.data,
 						   RelationGetRelationName(pk_rel))));
 	else
 		ereport(ERROR,
@@ -3507,7 +3499,7 @@ ri_ReportViolation(RI_QueryKey *qkey, const char *constrname,
 						RelationGetRelationName(pk_rel),
 						constrname, RelationGetRelationName(fk_rel)),
 			errdetail("Key (%s)=(%s) is still referenced from table \"%s\".",
-					  key_names, key_values,
+					  key_names.data, key_values.data,
 					  RelationGetRelationName(fk_rel))));
 }
 

src/backend/utils/adt/ruleutils.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.305 2009/07/29 20:56:19 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.306 2009/08/01 19:59:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -142,7 +142,8 @@ static char *pg_get_viewdef_worker(Oid viewoid, int prettyFlags);
 static void decompile_column_index_array(Datum column_index_array, Oid relId,
 							 StringInfo buf);
 static char *pg_get_ruledef_worker(Oid ruleoid, int prettyFlags);
-static char *pg_get_indexdef_worker(Oid indexrelid, int colno, bool showTblSpc,
+static char *pg_get_indexdef_worker(Oid indexrelid, int colno,
+					   bool attrsOnly, bool showTblSpc,
 					   int prettyFlags);
 static char *pg_get_constraintdef_worker(Oid constraintId, bool fullCommand,
 							int prettyFlags);
@@ -613,7 +614,7 @@ pg_get_indexdef(PG_FUNCTION_ARGS)
 	Oid			indexrelid = PG_GETARG_OID(0);
 
 	PG_RETURN_TEXT_P(string_to_text(pg_get_indexdef_worker(indexrelid, 0,
-														   false, 0)));
+														   false, false, 0)));
 }
 
 Datum
@@ -626,18 +627,31 @@ pg_get_indexdef_ext(PG_FUNCTION_ARGS)
 
 	prettyFlags = pretty ? PRETTYFLAG_PAREN | PRETTYFLAG_INDENT : 0;
 	PG_RETURN_TEXT_P(string_to_text(pg_get_indexdef_worker(indexrelid, colno,
-													   false, prettyFlags)));
+														   colno != 0,
+														   false,
+														   prettyFlags)));
 }
 
 /* Internal version that returns a palloc'd C string */
 char *
 pg_get_indexdef_string(Oid indexrelid)
 {
-	return pg_get_indexdef_worker(indexrelid, 0, true, 0);
+	return pg_get_indexdef_worker(indexrelid, 0, false, true, 0);
+}
+
+/* Internal version that just reports the column definitions */
+char *
+pg_get_indexdef_columns(Oid indexrelid, bool pretty)
+{
+	int			prettyFlags;
+
+	prettyFlags = pretty ? PRETTYFLAG_PAREN | PRETTYFLAG_INDENT : 0;
+	return pg_get_indexdef_worker(indexrelid, 0, true, false, prettyFlags);
 }
 
 static char *
-pg_get_indexdef_worker(Oid indexrelid, int colno, bool showTblSpc,
+pg_get_indexdef_worker(Oid indexrelid, int colno,
+					   bool attrsOnly, bool showTblSpc,
 					   int prettyFlags)
 {
 	HeapTuple	ht_idx;
@@ -736,7 +750,7 @@ pg_get_indexdef_worker(Oid indexrelid, int colno, bool showTblSpc,
 	 */
 	initStringInfo(&buf);
 
-	if (!colno)
+	if (!attrsOnly)
 		appendStringInfo(&buf, "CREATE %sINDEX %s ON %s USING %s (",
 						 idxrec->indisunique ? "UNIQUE " : "",
 						 quote_identifier(NameStr(idxrelrec->relname)),
@@ -790,8 +804,7 @@ pg_get_indexdef_worker(Oid indexrelid, int colno, bool showTblSpc,
 			keycoltype = exprType(indexkey);
 		}
 
-		/* Provide decoration only in the colno=0 case */
-		if (!colno)
+		if (!attrsOnly && (!colno || colno == keyno + 1))
 		{
 			/* Add the operator class name, if not default */
 			get_opclass_name(indclass->values[keyno], keycoltype, &buf);
@@ -816,7 +829,7 @@ pg_get_indexdef_worker(Oid indexrelid, int colno, bool showTblSpc,
 		}
 	}
 
-	if (!colno)
+	if (!attrsOnly)
 	{
 		appendStringInfoChar(&buf, ')');
 

src/include/access/genam.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/genam.h,v 1.79 2009/07/29 20:56:19 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/genam.h,v 1.80 2009/08/01 19:59:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -164,6 +164,8 @@ extern FmgrInfo *index_getprocinfo(Relation irel, AttrNumber attnum,
 extern IndexScanDesc RelationGetIndexScan(Relation indexRelation,
 					 int nkeys, ScanKey key);
 extern void IndexScanEnd(IndexScanDesc scan);
+extern void ReportUniqueViolation(Relation indexRelation,
+								  Datum *values, bool *isnull);
 
 /*
  * heap-or-index access to system catalogs (in genam.c)

src/include/access/itup.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/itup.h,v 1.51 2009/01/01 17:23:56 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/access/itup.h,v 1.52 2009/08/01 19:59:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -143,6 +143,8 @@ extern IndexTuple index_form_tuple(TupleDesc tupleDescriptor,
 				 Datum *values, bool *isnull);
 extern Datum nocache_index_getattr(IndexTuple tup, int attnum,
 					  TupleDesc tupleDesc, bool *isnull);
+extern void index_deform_tuple(IndexTuple tup, TupleDesc tupleDescriptor,
+				 Datum *values, bool *isnull);
 extern IndexTuple CopyIndexTuple(IndexTuple source);
 
 #endif   /* ITUP_H */

src/include/utils/builtins.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.335 2009/07/29 20:56:21 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.336 2009/08/01 19:59:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -575,6 +575,7 @@ extern Datum pg_get_viewdef_name_ext(PG_FUNCTION_ARGS);
 extern Datum pg_get_indexdef(PG_FUNCTION_ARGS);
 extern Datum pg_get_indexdef_ext(PG_FUNCTION_ARGS);
 extern char *pg_get_indexdef_string(Oid indexrelid);
+extern char *pg_get_indexdef_columns(Oid indexrelid, bool pretty);
 extern Datum pg_get_triggerdef(PG_FUNCTION_ARGS);
 extern Datum pg_get_constraintdef(PG_FUNCTION_ARGS);
 extern Datum pg_get_constraintdef_ext(PG_FUNCTION_ARGS);

src/interfaces/ecpg/test/expected/compat_informix-test_informix.stderr

@@ -23,6 +23,7 @@
 [NO_PID]: ecpg_execute on line 31: using PQexec
 [NO_PID]: sqlca: code: 0, state: 00000
 [NO_PID]: ecpg_check_PQresult on line 31: ERROR:  duplicate key value violates unique constraint "test_pkey"
+DETAIL:  Key (i)=(7) already exists.
 [NO_PID]: sqlca: code: 0, state: 00000
 [NO_PID]: raising sqlstate 23505 (sqlcode -239) on line 31: duplicate key value violates unique constraint "test_pkey" on line 31
 [NO_PID]: sqlca: code: -239, state: 23505

src/test/regress/expected/alter_table.out

@@ -407,6 +407,7 @@ insert into atacc1 (test) values (2);
 -- should fail
 insert into atacc1 (test) values (2);
 ERROR:  duplicate key value violates unique constraint "atacc_test1"
+DETAIL:  Key (test)=(2) already exists.
 -- should succeed
 insert into atacc1 (test) values (4);
 -- try adding a unique oid constraint
@@ -442,6 +443,7 @@ insert into atacc1 (test,test2) values (4,4);
 -- should fail
 insert into atacc1 (test,test2) values (4,4);
 ERROR:  duplicate key value violates unique constraint "atacc_test1"
+DETAIL:  Key (test, test2)=(4, 4) already exists.
 -- should all succeed
 insert into atacc1 (test,test2) values (4,5);
 insert into atacc1 (test,test2) values (5,4);
@@ -456,6 +458,7 @@ NOTICE:  ALTER TABLE / ADD UNIQUE will create implicit index "atacc1_test2_key"
 insert into atacc1 (test2, test) values (3, 3);
 insert into atacc1 (test2, test) values (2, 3);
 ERROR:  duplicate key value violates unique constraint "atacc1_test_key"
+DETAIL:  Key (test)=(3) already exists.
 drop table atacc1;
 -- test primary key constraint adding
 create table atacc1 ( test int ) with oids;
@@ -467,6 +470,7 @@ insert into atacc1 (test) values (2);
 -- should fail
 insert into atacc1 (test) values (2);
 ERROR:  duplicate key value violates unique constraint "atacc_test1"
+DETAIL:  Key (test)=(2) already exists.
 -- should succeed
 insert into atacc1 (test) values (4);
 -- inserting NULL should fail
@@ -534,6 +538,7 @@ insert into atacc1 (test,test2) values (4,4);
 -- should fail
 insert into atacc1 (test,test2) values (4,4);
 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
 insert into atacc1 (test,test2) values (3, NULL);
@@ -552,6 +557,7 @@ NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "atacc1_pkey" for
 insert into atacc1 (test2, test) values (3, 3);
 insert into atacc1 (test2, test) values (2, 3);
 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
 drop table atacc1;

src/test/regress/expected/arrays.out

@@ -713,6 +713,7 @@ insert into arr_tbl values ('{1,2}');
 -- failure expected:
 insert into arr_tbl values ('{1,2,3}');
 ERROR:  duplicate key value violates unique constraint "arr_tbl_f1_key"
+DETAIL:  Key (f1)=({1,2,3}) already exists.
 insert into arr_tbl values ('{2,3,4}');
 insert into arr_tbl values ('{1,5,3}');
 insert into arr_tbl values ('{1,2,10}');

src/test/regress/expected/create_index.out

@@ -641,6 +641,7 @@ INSERT INTO func_index_heap VALUES('QWE','RTY');
 -- this should fail because of unique index:
 INSERT INTO func_index_heap VALUES('ABCD', 'EF');
 ERROR:  duplicate key value violates unique constraint "func_index_index"
+DETAIL:  Key (textcat(f1, f2))=(ABCDEF) already exists.
 -- but this shouldn't:
 INSERT INTO func_index_heap VALUES('QWERTY');
 --
@@ -655,6 +656,7 @@ INSERT INTO func_index_heap VALUES('QWE','RTY');
 -- this should fail because of unique index:
 INSERT INTO func_index_heap VALUES('ABCD', 'EF');
 ERROR:  duplicate key value violates unique constraint "func_index_index"
+DETAIL:  Key ((f1 || f2))=(ABCDEF) already exists.
 -- but this shouldn't:
 INSERT INTO func_index_heap VALUES('QWERTY');
 --
@@ -679,6 +681,7 @@ CREATE UNIQUE INDEX CONCURRENTLY concur_index2 ON concur_heap(f1);
 -- check if constraint is set up properly to be enforced
 INSERT INTO concur_heap VALUES ('b','x');
 ERROR:  duplicate key value violates unique constraint "concur_index2"
+DETAIL:  Key (f1)=(b) already exists.
 -- check if constraint is enforced properly at build time
 CREATE UNIQUE INDEX CONCURRENTLY concur_index3 ON concur_heap(f2);
 ERROR:  could not create unique index "concur_index3"

src/test/regress/expected/inherit.out

@@ -638,6 +638,7 @@ NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "inhg_pkey" for t
 INSERT INTO inhg VALUES (5, 10);
 INSERT INTO inhg VALUES (20, 10); -- should fail
 ERROR:  duplicate key value violates unique constraint "inhg_pkey"
+DETAIL:  Key (xx)=(10) already exists.
 DROP TABLE inhg;
 /* Multiple primary keys creation should fail */
 CREATE TABLE inhg (x text, LIKE inhx INCLUDING INDEXES, PRIMARY KEY(x)); /* fails */
@@ -653,6 +654,7 @@ INSERT INTO inhg (xx, yy, x) VALUES ('test', 5, 10);
 INSERT INTO inhg (xx, yy, x) VALUES ('test', 10, 15);
 INSERT INTO inhg (xx, yy, x) VALUES ('foo', 10, 15); -- should fail
 ERROR:  duplicate key value violates unique constraint "inhg_x_key"
+DETAIL:  Key (x)=(15) already exists.
 DROP TABLE inhg;
 DROP TABLE inhz;
 -- Test changing the type of inherited columns

src/test/regress/expected/plpgsql.out

@@ -1517,6 +1517,7 @@ select * from PField_v1 where pfname = 'PF0_2' order by slotname;
 --
 insert into PField values ('PF1_1', 'should fail due to unique index');
 ERROR:  duplicate key value violates unique constraint "pfield_name"
+DETAIL:  Key (name)=(PF1_1) already exists.
 update PSlot set backlink = 'WS.not.there' where slotname = 'PS.base.a1';
 ERROR:  WS.not.there         does not exist
 CONTEXT:  PL/pgSQL function "tg_backlink_a" line 16 at assignment
@@ -1531,6 +1532,7 @@ ERROR:  illegal slotlink beginning with XX
 CONTEXT:  PL/pgSQL function "tg_slotlink_a" line 16 at assignment
 insert into HSlot values ('HS', 'base.hub1', 1, '');
 ERROR:  duplicate key value violates unique constraint "hslot_name"
+DETAIL:  Key (slotname)=(HS.base.hub1.1      ) already exists.
 insert into HSlot values ('HS', 'base.hub1', 20, '');
 ERROR:  no manual manipulation of HSlot
 delete from HSlot;

src/test/regress/expected/transactions.out

@@ -468,12 +468,14 @@ NOTICE:  CREATE TABLE / UNIQUE will create implicit index "koju_a_key" for table
 		INSERT INTO koju VALUES (1);
 		INSERT INTO koju VALUES (1);
 ERROR:  duplicate key value violates unique constraint "koju_a_key"
+DETAIL:  Key (a)=(1) already exists.
 	rollback to x;
 	CREATE TABLE koju (a INT UNIQUE);
 NOTICE:  CREATE TABLE / UNIQUE will create implicit index "koju_a_key" for table "koju"
 	INSERT INTO koju VALUES (1);
 	INSERT INTO koju VALUES (1);
 ERROR:  duplicate key value violates unique constraint "koju_a_key"
+DETAIL:  Key (a)=(1) already exists.
 ROLLBACK;
 DROP TABLE foo;
 DROP TABLE baz;

src/test/regress/expected/uuid.out

@@ -119,6 +119,7 @@ CREATE UNIQUE INDEX guid1_unique_BTREE ON guid1 USING BTREE (guid_field);
 -- should fail
 INSERT INTO guid1(guid_field) VALUES('11111111-1111-1111-1111-111111111111');
 ERROR:  duplicate key value violates unique constraint "guid1_unique_btree"
+DETAIL:  Key (guid_field)=(11111111-1111-1111-1111-111111111111) already exists.
 -- check to see whether the new indexes are actually there
 SELECT count(*) FROM pg_class WHERE relkind='i' AND relname LIKE 'guid%';
  count 

src/test/regress/output/constraints.source

@@ -294,6 +294,7 @@ INSERT INTO PRIMARY_TBL VALUES (1, 'one');
 INSERT INTO PRIMARY_TBL VALUES (2, 'two');
 INSERT INTO PRIMARY_TBL VALUES (1, 'three');
 ERROR:  duplicate key value violates unique constraint "primary_tbl_pkey"
+DETAIL:  Key (i)=(1) already exists.
 INSERT INTO PRIMARY_TBL VALUES (4, 'three');
 INSERT INTO PRIMARY_TBL VALUES (5, 'one');
 INSERT INTO PRIMARY_TBL (t) VALUES ('six');
@@ -338,6 +339,7 @@ INSERT INTO UNIQUE_TBL VALUES (1, 'one');
 INSERT INTO UNIQUE_TBL VALUES (2, 'two');
 INSERT INTO UNIQUE_TBL VALUES (1, 'three');
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i)=(1) already exists.
 INSERT INTO UNIQUE_TBL VALUES (4, 'four');
 INSERT INTO UNIQUE_TBL VALUES (5, 'one');
 INSERT INTO UNIQUE_TBL (t) VALUES ('six');
@@ -362,6 +364,7 @@ INSERT INTO UNIQUE_TBL VALUES (2, 'two');
 INSERT INTO UNIQUE_TBL VALUES (1, 'three');
 INSERT INTO UNIQUE_TBL VALUES (1, 'one');
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i, t)=(1, one) already exists.
 INSERT INTO UNIQUE_TBL VALUES (5, 'one');
 INSERT INTO UNIQUE_TBL (t) VALUES ('six');
 SELECT '' AS five, * FROM UNIQUE_TBL;
@@ -389,6 +392,7 @@ BEGIN;
 -- default is immediate so this should fail right away
 UPDATE unique_tbl SET i = 1 WHERE i = 0;
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i)=(1) already exists.
 ROLLBACK;
 -- check is done at end of statement, so this should succeed
 UPDATE unique_tbl SET i = i+1;
@@ -446,11 +450,13 @@ BEGIN;
 INSERT INTO unique_tbl VALUES (3, 'Three'); -- should succeed for now
 COMMIT; -- should fail
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i)=(3) already exists.
 -- make constraint check immediate
 BEGIN;
 SET CONSTRAINTS ALL IMMEDIATE;
 INSERT INTO unique_tbl VALUES (3, 'Three'); -- should fail
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i)=(3) already exists.
 COMMIT;
 -- forced check when SET CONSTRAINTS is called
 BEGIN;
@@ -458,6 +464,7 @@ SET CONSTRAINTS ALL DEFERRED;
 INSERT INTO unique_tbl VALUES (3, 'Three'); -- should succeed for now
 SET CONSTRAINTS ALL IMMEDIATE; -- should fail
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i)=(3) already exists.
 COMMIT;
 -- test a HOT update that invalidates the conflicting tuple.
 -- the trigger should still fire and catch the violation
@@ -466,6 +473,7 @@ INSERT INTO unique_tbl VALUES (3, 'Three'); -- should succeed for now
 UPDATE unique_tbl SET t = 'THREE' WHERE i = 3 AND t = 'Three';
 COMMIT; -- should fail
 ERROR:  duplicate key value violates unique constraint "unique_tbl_i_key"
+DETAIL:  Key (i)=(3) already exists.
 SELECT * FROM unique_tbl;
  i |   t   
 ---+-------

src/test/regress/output/tablespace.source

@@ -49,6 +49,7 @@ ALTER INDEX testschema.anindex SET TABLESPACE testspace;
 INSERT INTO testschema.atable VALUES(3);	-- ok
 INSERT INTO testschema.atable VALUES(1);	-- fail (checks index)
 ERROR:  duplicate key value violates unique constraint "anindex"
+DETAIL:  Key (column1)=(1) already exists.
 SELECT COUNT(*) FROM testschema.atable;		-- checks heap
  count 
 -------