SELECT count(*) AS columnar_table_count FROM cstore.cstore_data_files \gset
CREATE TABLE t(a int, b int) USING cstore_tableam;
SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
 count 
-------
     0
(1 row)

INSERT INTO t SELECT i, i * i FROM generate_series(1, 10) i;
INSERT INTO t SELECT i, i * i FROM generate_series(11, 20) i;
INSERT INTO t SELECT i, i * i FROM generate_series(21, 30) i;
SELECT sum(a), sum(b) FROM t;
 sum | sum  
-----+------
 465 | 9455
(1 row)

SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
 count 
-------
     3
(1 row)

-- vacuum full should merge stripes together
VACUUM FULL t;
SELECT sum(a), sum(b) FROM t;
 sum | sum  
-----+------
 465 | 9455
(1 row)

SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
 count 
-------
     1
(1 row)

-- test the case when all data cannot fit into a single stripe
SET cstore.stripe_row_count TO 1000;
INSERT INTO t SELECT i, 2 * i FROM generate_series(1,2500) i;
SELECT sum(a), sum(b) FROM t;
   sum   |   sum   
---------+---------
 3126715 | 6261955
(1 row)

SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
 count 
-------
     4
(1 row)

VACUUM FULL t;
SELECT sum(a), sum(b) FROM t;
   sum   |   sum   
---------+---------
 3126715 | 6261955
(1 row)

SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
 count 
-------
     3
(1 row)

-- VACUUM FULL doesn't reclaim dropped columns, but converts them to NULLs
ALTER TABLE t DROP COLUMN a;
SELECT stripe, attr, block, minimum_value IS NULL, maximum_value IS NULL FROM cstore.cstore_skipnodes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t' ORDER BY 1, 2, 3;
 stripe | attr | block | ?column? | ?column? 
--------+------+-------+----------+----------
      0 |    1 |     0 | f        | f
      0 |    2 |     0 | f        | f
      1 |    1 |     0 | f        | f
      1 |    2 |     0 | f        | f
      2 |    1 |     0 | f        | f
      2 |    2 |     0 | f        | f
(6 rows)

VACUUM FULL t;
SELECT stripe, attr, block, minimum_value IS NULL, maximum_value IS NULL FROM cstore.cstore_skipnodes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t' ORDER BY 1, 2, 3;
 stripe | attr | block | ?column? | ?column? 
--------+------+-------+----------+----------
      0 |    1 |     0 | t        | t
      0 |    2 |     0 | f        | f
      1 |    1 |     0 | t        | t
      1 |    2 |     0 | f        | f
      2 |    1 |     0 | t        | t
      2 |    2 |     0 | f        | f
(6 rows)

-- Make sure we cleaned-up the transient table metadata after VACUUM FULL commands
SELECT count(*) - :columnar_table_count FROM cstore.cstore_data_files;
 ?column? 
----------
        1
(1 row)

DROP TABLE t;
-- Make sure we cleaned the metadata for t too
SELECT count(*) - :columnar_table_count FROM cstore.cstore_data_files;
 ?column? 
----------
        0
(1 row)