citus/src/test/regress/sql/multi_alter_table_add_constraints.sql

--
-- MULTI_ALTER_TABLE_ADD_CONSTRAINTS
--
-- Test checks whether constraints of distributed tables can be adjusted using
-- the ALTER TABLE ... ADD CONSTRAINT ... command.

ALTER SEQUENCE pg_catalog.pg_dist_shardid_seq RESTART 1450000;
ALTER SEQUENCE pg_catalog.pg_dist_placement_placementid_seq RESTART 1450000;

-- Check "PRIMARY KEY CONSTRAINT"
CREATE TABLE products (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products', 'product_no');

-- Can only add primary key constraint on distribution column (or group of columns
-- including distribution column)
-- Command below should error out since 'name' is not a distribution column
ALTER TABLE products ADD CONSTRAINT p_key PRIMARY KEY(name);
ALTER TABLE products ADD CONSTRAINT p_key PRIMARY KEY(product_no);

INSERT INTO products VALUES(1, 'product_1', 1);

-- Should error out, since we are trying to add a new row having a value on p_key column
-- conflicting with the existing row.
INSERT INTO products VALUES(1, 'product_1', 1);

ALTER TABLE products DROP CONSTRAINT p_key;
INSERT INTO products VALUES(1, 'product_1', 1);

-- Can not create constraint since it conflicts with the existing data
ALTER TABLE products ADD CONSTRAINT p_key PRIMARY KEY(product_no);

DROP TABLE products;

-- Check "PRIMARY KEY CONSTRAINT" with reference table
CREATE TABLE products_ref (
    product_no integer,
    name text,
    price numeric
);

SELECT create_reference_table('products_ref');

-- Can add PRIMARY KEY to any column
ALTER TABLE products_ref ADD CONSTRAINT p_key PRIMARY KEY(name);
ALTER TABLE products_ref DROP CONSTRAINT p_key;
ALTER TABLE products_ref ADD CONSTRAINT p_key PRIMARY KEY(product_no);

INSERT INTO products_ref VALUES(1, 'product_1', 1);

-- Should error out, since we are trying to add new row having a value on p_key column
-- conflicting with the existing row.
INSERT INTO products_ref VALUES(1, 'product_1', 1);

DROP TABLE products_ref;

-- Check "PRIMARY KEY CONSTRAINT" on append table
CREATE TABLE products_append (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products_append', 'product_no', 'append');

-- Can only add primary key constraint on distribution column (or group
-- of columns including distribution column)
-- Command below should error out since 'name' is not a distribution column
ALTER TABLE products_append ADD CONSTRAINT p_key_name PRIMARY KEY(name);
ALTER TABLE products_append ADD CONSTRAINT p_key PRIMARY KEY(product_no);

--- Error out since first and third rows have the same product_no		
\COPY products_append FROM STDIN DELIMITER AS ',';
1, Product_1, 10
2, Product_2, 15
1, Product_3, 8
\.

DROP TABLE products_append;


-- Check "UNIQUE CONSTRAINT"
CREATE TABLE unique_test_table(id int, name varchar(20));
SELECT create_distributed_table('unique_test_table', 'id');

-- Can only add unique constraint on distribution column (or group
-- of columns including distribution column)
-- Command below should error out since 'name' is not a distribution column
ALTER TABLE unique_test_table ADD CONSTRAINT unn_name UNIQUE(name);
ALTER TABLE unique_test_table ADD CONSTRAINT unn_id UNIQUE(id);

-- Error out, since table can not have two rows with same id.
INSERT INTO unique_test_table VALUES(1, 'Ahmet');
INSERT INTO unique_test_table VALUES(1, 'Mehmet');

ALTER TABLE unique_test_table DROP CONSTRAINT unn_id;

-- Insert row which will conflict with the next unique constraint command
INSERT INTO unique_test_table VALUES(1, 'Mehmet');

-- Can not create constraint since it conflicts with the existing data
ALTER TABLE unique_test_table ADD CONSTRAINT unn_id UNIQUE(id);

-- Can create unique constraint over multiple columns which must include
-- distribution column
ALTER TABLE unique_test_table ADD CONSTRAINT unn_id_name UNIQUE(id, name);

-- Error out, since tables can not have two rows with same id and name.
INSERT INTO unique_test_table VALUES(1, 'Mehmet');
DROP TABLE unique_test_table;

-- Check "UNIQUE CONSTRAINT" with reference table
CREATE TABLE unique_test_table_ref(id int, name varchar(20));
SELECT create_reference_table('unique_test_table_ref');

-- We can add unique constraint on any column with reference tables
ALTER TABLE unique_test_table_ref ADD CONSTRAINT unn_name UNIQUE(name);
ALTER TABLE unique_test_table_ref ADD CONSTRAINT unn_id UNIQUE(id);

-- Error out. Since the table can not have two rows with the same id. 
INSERT INTO unique_test_table_ref VALUES(1, 'Ahmet');
INSERT INTO unique_test_table_ref VALUES(1, 'Mehmet');

-- We can add unique constraint with multiple columns 
ALTER TABLE unique_test_table_ref DROP CONSTRAINT unn_id;
ALTER TABLE unique_test_table_ref ADD CONSTRAINT unn_id_name UNIQUE(id,name);

-- Error out, since two rows can not have the same id or name.
INSERT INTO unique_test_table_ref VALUES(1, 'Mehmet');

DROP TABLE unique_test_table_ref;

-- Check "UNIQUE CONSTRAINT" with append table
CREATE TABLE unique_test_table_append(id int, name varchar(20));
SELECT create_distributed_table('unique_test_table_append', 'id', 'append');

-- Can only add unique constraint on distribution column (or group
-- of columns including distribution column)
-- Command below should error out since 'name' is not a distribution column
ALTER TABLE unique_test_table_append ADD CONSTRAINT unn_name UNIQUE(name);
ALTER TABLE unique_test_table_append ADD CONSTRAINT unn_id UNIQUE(id);

-- Error out. Table can not have two rows with the same id.		
\COPY unique_test_table_append FROM STDIN DELIMITER AS ',';		
1, Product_1
2, Product_2
1, Product_3
\.

DROP TABLE unique_test_table_append;

-- Check "CHECK CONSTRAINT"
CREATE TABLE products (
    product_no integer,
    name text,
    price numeric,
    discounted_price numeric
);

SELECT create_distributed_table('products', 'product_no');

-- Can add column and table check constraints
ALTER TABLE products ADD CONSTRAINT p_check CHECK(price > 0);
ALTER TABLE products ADD CONSTRAINT p_multi_check CHECK(price > discounted_price);

-- First and third queries will error out, because of conflicts with p_check and 
-- p_multi_check, respectively.
INSERT INTO products VALUES(1, 'product_1', -1, -2);
INSERT INTO products VALUES(1, 'product_1', 5, 3);
INSERT INTO products VALUES(1, 'product_1', 2, 3);

DROP TABLE products;

-- Check "CHECK CONSTRAINT" with reference table 
CREATE TABLE products_ref (
    product_no integer,
    name text,
    price numeric,
    discounted_price numeric
);

SELECT create_reference_table('products_ref');

-- Can add column and table check constraints
ALTER TABLE products_ref ADD CONSTRAINT p_check CHECK(price > 0);
ALTER TABLE products_ref ADD CONSTRAINT p_multi_check CHECK(price > discounted_price);

-- First and third queries will error out, because of conflicts with p_check and 
-- p_multi_check, respectively.
INSERT INTO products_ref VALUES(1, 'product_1', -1, -2);
INSERT INTO products_ref VALUES(1, 'product_1', 5, 3);
INSERT INTO products_ref VALUES(1, 'product_1', 2, 3);

DROP TABLE products_ref;

-- Check "CHECK CONSTRAINT" with append table
CREATE TABLE products_append (
    product_no int,
    name varchar(20),
    price int,
    discounted_price int
);

SELECT create_distributed_table('products_append', 'product_no', 'append');

-- Can add column and table check constraints
ALTER TABLE products_append ADD CONSTRAINT p_check CHECK(price > 0);
ALTER TABLE products_append ADD CONSTRAINT p_multi_check CHECK(price > discounted_price);

-- Error out,since the third row conflicting with the p_multi_check
\COPY products_append FROM STDIN DELIMITER AS ',';
1, Product_1, 10, 5
2, Product_2, 15, 8
1, Product_3, 8, 10
\.

DROP TABLE products_append;


-- Check "EXCLUSION CONSTRAINT"
CREATE TABLE products (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products', 'product_no');

-- Can only add exclusion constraint on distribution column (or group of columns
-- including distribution column)
-- Command below should error out since 'name' is not a distribution column
ALTER TABLE products ADD CONSTRAINT exc_name EXCLUDE USING btree (name with =); 

-- We can add composite exclusion 
ALTER TABLE products ADD CONSTRAINT exc_pno_name EXCLUDE USING btree (product_no with =, name with =);

-- 4th command will error out since it conflicts with exc_pno_name constraint
INSERT INTO products VALUES(1,'product_1', 5);
INSERT INTO products VALUES(1,'product_2', 10);
INSERT INTO products VALUES(2,'product_2', 5);
INSERT INTO products VALUES(2,'product_2', 5);

DROP TABLE products;

-- Check "EXCLUSION CONSTRAINT" with reference table
CREATE TABLE products_ref (
    product_no integer,
    name text,
    price numeric
);

SELECT create_reference_table('products_ref');

-- We can add exclusion constraint on any column
ALTER TABLE products_ref ADD CONSTRAINT exc_name EXCLUDE USING btree (name with =); 

-- We can add composite exclusion because none of pair of rows are conflicting
ALTER TABLE products_ref ADD CONSTRAINT exc_pno_name EXCLUDE USING btree (product_no with =, name with =);

-- Third insertion will error out, since it has the same name with second insertion
INSERT INTO products_ref VALUES(1,'product_1', 5);
INSERT INTO products_ref VALUES(1,'product_2', 10);
INSERT INTO products_ref VALUES(2,'product_2', 5);

DROP TABLE products_ref;

-- Check "EXCLUSION CONSTRAINT" with append table
CREATE TABLE products_append (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products_append', 'product_no','append');

-- Can only add exclusion constraint on distribution column (or group of column 
-- including distribution column)
-- Command below should error out since 'name' is not a distribution column
ALTER TABLE products_append ADD CONSTRAINT exc_name EXCLUDE USING btree (name with =); 
ALTER TABLE products_append ADD CONSTRAINT exc_pno_name EXCLUDE USING btree (product_no with =, name with =);

-- Error out since first and third can not pass the exclusion check.		
\COPY products_append FROM STDIN DELIMITER AS ',';
1, Product_1, 10
1, Product_2, 15
1, Product_1, 8
\.

DROP TABLE products_append;

-- Check "NOT NULL"
CREATE TABLE products (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products', 'product_no');

ALTER TABLE products ALTER COLUMN name SET NOT NULL;

-- Insertions will error out since both product_no and name can not have NULL value
INSERT INTO products VALUES(1,NULL,5);
INSERT INTO products VALUES(NULL,'product_1', 5);

DROP TABLE products;

-- Check "NOT NULL" with reference table
CREATE TABLE products_ref (
    product_no integer,
    name text,
    price numeric
);

SELECT create_reference_table('products_ref');

ALTER TABLE products_ref ALTER COLUMN name SET NOT NULL;

-- Insertions will error out since both product_no and name can not have NULL value
INSERT INTO products_ref VALUES(1,NULL,5);
INSERT INTO products_ref VALUES(NULL,'product_1', 5);

DROP TABLE products_ref;

-- Check "NOT NULL" with append table
CREATE TABLE products_append (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products_append', 'product_no', 'append');

ALTER TABLE products_append ALTER COLUMN name SET NOT NULL;

-- Error out since name and product_no columns can not handle NULL value.
\COPY products_append FROM STDIN DELIMITER AS ',';
1, \N, 10
\N, Product_2, 15
1, Product_1, 8
\.

DROP TABLE products_append;


-- Tests for ADD CONSTRAINT is not only subcommand
CREATE TABLE products (
    product_no integer,
    name text,
    price numeric
);

SELECT create_distributed_table('products', 'product_no');

-- Should error out since add constraint is not the single subcommand
ALTER TABLE products ADD CONSTRAINT unn_1 UNIQUE(product_no, price), ADD CONSTRAINT unn_2 UNIQUE(product_no, name);

-- Tests for constraints without name
-- Commands below should error out since constraints do not have the name 
ALTER TABLE products ADD UNIQUE(product_no);
ALTER TABLE products ADD PRIMARY KEY(product_no);
ALTER TABLE products ADD CHECK(product_no <> 0);
ALTER TABLE products ADD EXCLUDE USING btree (product_no with =);

DROP TABLE products;


-- Tests with transactions 
CREATE TABLE products (
    product_no integer,
    name text,
    price numeric,
    discounted_price numeric
);

SELECT create_distributed_table('products', 'product_no');

BEGIN;
INSERT INTO products VALUES(1,'product_1', 5);

-- DDL may error out after an INSERT because it might pick the wrong connection
ALTER TABLE products ADD CONSTRAINT unn_pno UNIQUE(product_no);
ROLLBACK;

BEGIN;
-- Add constraints
ALTER TABLE products ADD CONSTRAINT unn_pno UNIQUE(product_no);
ALTER TABLE products ADD CONSTRAINT check_price CHECK(price > discounted_price);
ALTER TABLE products ALTER COLUMN product_no SET NOT NULL;
ALTER TABLE products ADD CONSTRAINT p_key_product PRIMARY KEY(product_no);

INSERT INTO products VALUES(1,'product_1', 10, 8);
ROLLBACK;

-- There should be no constraint on master and worker(s) 
SELECT "Constraint", "Definition" FROM table_checks WHERE relid='products'::regclass;

\c - - - :worker_1_port

SELECT "Constraint", "Definition" FROM table_checks WHERE relid='public.products_1450202'::regclass;

\c - - - :master_port

-- Tests to check the effect of rollback
BEGIN;
-- Add constraints (which will be rollbacked)
ALTER TABLE products ADD CONSTRAINT unn_pno UNIQUE(product_no);
ALTER TABLE products ADD CONSTRAINT check_price CHECK(price > discounted_price);
ALTER TABLE products ADD CONSTRAINT p_key_product PRIMARY KEY(product_no);
ROLLBACK;

-- There should be no constraint on master and worker(s) 
SELECT "Constraint", "Definition" FROM table_checks WHERE relid='products'::regclass;

\c - - - :worker_1_port

SELECT "Constraint", "Definition" FROM table_checks WHERE relid='public.products_1450202'::regclass;

\c - - - :master_port
DROP TABLE products;