-- DROP a table's column before making it a hypertable
CREATE TABLE alter_before(id serial, time timestamp, temp float, colorid integer);
ALTER TABLE alter_before DROP COLUMN id;

SELECT create_hypertable('alter_before', 'time', chunk_time_interval => 2628000000000);

INSERT INTO alter_before VALUES ('2017-03-22T09:18:22', 23.5, 1);

SELECT * FROM alter_before;

-- Show that deleted column is marked as dropped and that attnums are
-- now different for the root table and the chunk
SELECT c.relname, a.attname, a.attnum FROM pg_attribute a, pg_class c
WHERE a.attrelid = c.oid
AND (c.relname LIKE '_hyper_1%_chunk' OR c.relname = 'alter_before')
AND a.attnum > 0;

-- DROP a table's column after making it a hypertable and having data
CREATE TABLE alter_after(id serial, time timestamp, temp float, colorid integer);
SELECT create_hypertable('alter_after', 'time', chunk_time_interval => 2628000000000);

-- Create first chunk
INSERT INTO alter_after (time, temp, colorid) VALUES ('2017-03-22T09:18:22', 23.5, 1);

ALTER TABLE alter_after DROP COLUMN id;

-- Creating new chunks after dropping a column should work just fine
INSERT INTO alter_after VALUES ('2017-03-22T09:18:23', 21.5, 1),
                               ('2017-05-22T09:18:22', 36.2, 2),
                               ('2017-05-22T09:18:23', 15.2, 2);

-- Make sure tuple conversion also works with COPY
\COPY alter_after FROM 'data/alter.tsv' NULL AS '';

-- Data should look OK
SELECT * FROM alter_after;

-- Show that attnums are different for chunks created after DROP
-- column
SELECT c.relname, a.attname, a.attnum FROM pg_attribute a, pg_class c
WHERE a.attrelid = c.oid
AND (c.relname LIKE '_hyper_2%_chunk' OR c.relname = 'alter_after')
AND a.attnum > 0;

-- Add an ID column again
ALTER TABLE alter_after ADD COLUMN id serial;

INSERT INTO alter_after (time, temp, colorid) VALUES ('2017-08-22T09:19:14', 12.5, 3);

SELECT c.relname, a.attname, a.attnum FROM pg_attribute a, pg_class c
WHERE a.attrelid = c.oid
AND (c.relname LIKE '_hyper_2%_chunk' OR c.relname = 'alter_after')
AND a.attnum > 0;

SELECT * FROM alter_after;