Change constraint syntax to SQL92 style.

Add tests for PRIMARY KEY and UNIQUE clauses.

src/test/regress/input/constraints.source

 --
 -- Check constraints
--- Constraints can be specified with either DEFAULT or CHECK clauses.
+-- Constraints can be specified with:
+--  - DEFAULT clause
+--  - CHECK clauses
+--  - PRIMARY KEY clauses
+--  - UNIQUE clauses
 --
 
 --
@@ -8,24 +12,26 @@
 --
 
 CREATE TABLE DEFAULT_TBL (i int DEFAULT 100,
- x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
+	x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
 
 INSERT INTO DEFAULT_TBL VALUES (1, 'thomas', 57.0613);
 INSERT INTO DEFAULT_TBL VALUES (1, 'bruce');
 INSERT INTO DEFAULT_TBL (i, f) VALUES (2, 987.654);
-INSERT INTO DEFAULT_TBL (x) VALUES ('tgl');
+INSERT INTO DEFAULT_TBL (x) VALUES ('marc');
 INSERT INTO DEFAULT_TBL VALUES (3, null, 1.0);
 
-SELECT '' AS four, * FROM DEFAULT_TBL;
+SELECT '' AS five, * FROM DEFAULT_TBL;
 
 CREATE SEQUENCE DEFAULT_SEQ;
+
 CREATE TABLE DEFAULTEXPR_TBL (i1 int DEFAULT 100 + (200-199) * 2,
- i2 int DEFAULT nextval('default_seq'));
+	i2 int DEFAULT nextval('default_seq'));
 
 INSERT INTO DEFAULTEXPR_TBL VALUES (-1, -2);
 INSERT INTO DEFAULTEXPR_TBL (i1) VALUES (-3);
 INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (-4);
 INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (NULL);
+
 SELECT '' AS four, * FROM DEFAULTEXPR_TBL;
 
 -- errors
@@ -39,8 +45,8 @@ CREATE TABLE error_tbl (b1 bool DEFAULT 1 < 2);
 -- CHECK syntax
 --
 
-CREATE TABLE CHECK_TBL (x int) 
- CONSTRAINT CHECK_CON CHECK (x > 3);
+CREATE TABLE CHECK_TBL (x int,
+	CONSTRAINT CHECK_CON CHECK (x > 3));
 
 INSERT INTO CHECK_TBL VALUES (5);
 INSERT INTO CHECK_TBL VALUES (4);
@@ -49,9 +55,14 @@ INSERT INTO CHECK_TBL VALUES (2);
 INSERT INTO CHECK_TBL VALUES (6);
 INSERT INTO CHECK_TBL VALUES (1);
 
+SELECT '' AS three, * FROM CHECK_TBL;
+
 CREATE SEQUENCE CHECK_SEQ;
-CREATE TABLE CHECK2_TBL (x int, y text, z int) 
- CONSTRAINT SEQUENCE_CON CHECK (x > 3 and y <> 'check failed' and x < 8);
+
+CREATE TABLE CHECK2_TBL (x int, y text, z int,
+	CONSTRAINT SEQUENCE_CON
+	CHECK (x > 3 and y <> 'check failed' and z < 8));
+
 INSERT INTO CHECK2_TBL VALUES (4, 'check ok', -2);
 INSERT INTO CHECK2_TBL VALUES (1, 'x check failed', -2);
 INSERT INTO CHECK2_TBL VALUES (5, 'z check failed', 10);
@@ -59,6 +70,8 @@ INSERT INTO CHECK2_TBL VALUES (0, 'check failed', -2);
 INSERT INTO CHECK2_TBL VALUES (6, 'check failed', 11);
 INSERT INTO CHECK2_TBL VALUES (7, 'check ok', 7);
 
+SELECT '' AS two, * from CHECK2_TBL;
+
 --
 -- Check constraints on INSERT
 --
@@ -66,15 +79,16 @@ INSERT INTO CHECK2_TBL VALUES (7, 'check ok', 7);
 CREATE SEQUENCE INSERT_SEQ;
 
 CREATE TABLE INSERT_TBL (x INT DEFAULT nextval('insert_seq'),
-y TEXT DEFAULT '-NULL-', z INT DEFAULT -1 * currval('insert_seq') ) 
-CONSTRAINT INSERT_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8), 
-CHECK x + z = 0;
+	y TEXT DEFAULT '-NULL-', z INT DEFAULT -1 * currval('insert_seq'),
+	CONSTRAINT INSERT_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8), 
+		CHECK (x + z = 0));
 
 INSERT INTO INSERT_TBL VALUES (null, null, null);
 INSERT INTO INSERT_TBL(x,z) VALUES (2, -2);
 
-SELECT * FROM INSERT_TBL;
-SELECT nextval('insert_seq');
+SELECT '' AS zero, * FROM INSERT_TBL;
+
+SELECT 'one' AS one, nextval('insert_seq');
 
 INSERT INTO INSERT_TBL(y) VALUES ('Y');
 INSERT INTO INSERT_TBL(y) VALUES ('Y');
@@ -83,15 +97,21 @@ INSERT INTO INSERT_TBL(z,x) VALUES (-7,  7);
 INSERT INTO INSERT_TBL VALUES (5, 'check failed', -5);
 INSERT INTO INSERT_TBL VALUES (7, '!check failed', -7);
 INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
-SELECT * FROM INSERT_TBL;
+
+SELECT '' AS four, * FROM INSERT_TBL;
+
 INSERT INTO INSERT_TBL(y,z) VALUES ('check failed', 4);
 INSERT INTO INSERT_TBL(x,y) VALUES (5, 'check failed');
 INSERT INTO INSERT_TBL(x,y) VALUES (5, '!check failed');
 INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
-SELECT * FROM INSERT_TBL;
-SELECT nextval('insert_seq');
+
+SELECT '' AS six, * FROM INSERT_TBL;
+
+SELECT 'seven' AS one, nextval('insert_seq');
+
 INSERT INTO INSERT_TBL(y) VALUES ('Y');
-SELECT currval('insert_seq');
+
+SELECT 'eight' AS one, currval('insert_seq');
 
 --
 -- Check constraints on INSERT INTO
@@ -99,18 +119,23 @@ SELECT currval('insert_seq');
 
 DELETE FROM INSERT_TBL;
 DROP SEQUENCE INSERT_SEQ;
+
 CREATE SEQUENCE INSERT_SEQ START 4;
+
 CREATE TABLE TEMP (xd INT, yd TEXT, zd INT);
 
 INSERT INTO TEMP VALUES (null, 'Y', null);
 INSERT INTO TEMP VALUES (5, '!check failed', null);
 INSERT INTO TEMP VALUES (null, 'try again', null);
 INSERT INTO INSERT_TBL(y) select yd from TEMP;
-SELECT * FROM INSERT_TBL;
+
+SELECT '' AS three, * FROM INSERT_TBL;
+
 INSERT INTO INSERT_TBL SELECT * FROM TEMP WHERE yd = 'try again';
 INSERT INTO INSERT_TBL(y,z) SELECT yd, -7 FROM TEMP WHERE yd = 'try again';
 INSERT INTO INSERT_TBL(y,z) SELECT yd, -8 FROM TEMP WHERE yd = 'try again';
-SELECT * FROM INSERT_TBL;
+
+SELECT '' AS four, * FROM INSERT_TBL;
 
 DROP TABLE TEMP;
 
@@ -122,17 +147,87 @@ UPDATE INSERT_TBL SET x = NULL WHERE x = 6;
 UPDATE INSERT_TBL SET x = 6 WHERE x = 6;
 UPDATE INSERT_TBL SET x = -z, z = -x;
 UPDATE INSERT_TBL SET x = z, z = x;
+
 SELECT * FROM INSERT_TBL;
 
+-- DROP TABLE INSERT_TBL;
+
 --
 -- Check constraints on COPY FROM
 --
 
-CREATE TABLE COPY_TBL (x INT, y TEXT, z INT) 
- CONSTRAINT COPY_CON CHECK (x > 3 AND y <> 'check failed' AND x < 7 );
+CREATE TABLE COPY_TBL (x INT, y TEXT, z INT,
+	CONSTRAINT COPY_CON
+	CHECK (x > 3 AND y <> 'check failed' AND x < 7 ));
 
 COPY COPY_TBL FROM '_OBJWD_/data/constro.data';
-SELECT * FROM COPY_TBL;
+
+SELECT '' AS two, * FROM COPY_TBL;
+
 COPY COPY_TBL FROM '_OBJWD_/data/constrf.data';
 
 SELECT * FROM COPY_TBL;
+
+--
+-- Primary keys
+--
+
+CREATE TABLE PRIMARY_TBL (i int PRIMARY KEY, t text);
+
+INSERT INTO PRIMARY_TBL VALUES (1, 'one');
+INSERT INTO PRIMARY_TBL VALUES (2, 'two');
+INSERT INTO PRIMARY_TBL VALUES (1, 'three');
+INSERT INTO PRIMARY_TBL VALUES (4, 'three');
+INSERT INTO PRIMARY_TBL VALUES (5, 'one');
+INSERT INTO PRIMARY_TBL (t) VALUES ('six');
+
+SELECT '' AS four, * FROM PRIMARY_TBL;
+
+DROP TABLE PRIMARY_TBL;
+
+CREATE TABLE PRIMARY_TBL (i int, t text,
+	PRIMARY KEY(i,t));
+
+INSERT INTO PRIMARY_TBL VALUES (1, 'one');
+INSERT INTO PRIMARY_TBL VALUES (2, 'two');
+INSERT INTO PRIMARY_TBL VALUES (1, 'three');
+INSERT INTO PRIMARY_TBL VALUES (4, 'three');
+INSERT INTO PRIMARY_TBL VALUES (5, 'one');
+INSERT INTO PRIMARY_TBL (t) VALUES ('six');
+
+SELECT '' AS three, * FROM PRIMARY_TBL;
+
+DROP TABLE PRIMARY_TBL;
+
+--
+-- Unique keys
+--
+
+CREATE TABLE UNIQUE_TBL (i int UNIQUE, t text);
+
+INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+INSERT INTO UNIQUE_TBL VALUES (2, 'two');
+INSERT INTO UNIQUE_TBL VALUES (1, 'three');
+INSERT INTO UNIQUE_TBL VALUES (4, 'four');
+INSERT INTO UNIQUE_TBL VALUES (5, 'one');
+INSERT INTO UNIQUE_TBL (t) VALUES ('six');
+INSERT INTO UNIQUE_TBL (t) VALUES ('seven');
+
+SELECT '' AS five, * FROM UNIQUE_TBL;
+
+DROP TABLE UNIQUE_TBL;
+
+CREATE TABLE UNIQUE_TBL (i int, t text,
+	UNIQUE(i,t));
+
+INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+INSERT INTO UNIQUE_TBL VALUES (2, 'two');
+INSERT INTO UNIQUE_TBL VALUES (1, 'three');
+INSERT INTO UNIQUE_TBL VALUES (1, 'one');
+INSERT INTO UNIQUE_TBL VALUES (5, 'one');
+INSERT INTO UNIQUE_TBL (t) VALUES ('six');
+
+SELECT '' AS five, * FROM UNIQUE_TBL;
+
+DROP TABLE UNIQUE_TBL;
+