mirror of https://github.com/citusdata/citus.git
90 lines
2.6 KiB
Plaintext
90 lines
2.6 KiB
Plaintext
CREATE TABLE t(a int, b int) USING cstore_tableam;
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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count
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-------
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0
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(1 row)
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INSERT INTO t SELECT i, i * i FROM generate_series(1, 10) i;
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INSERT INTO t SELECT i, i * i FROM generate_series(11, 20) i;
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INSERT INTO t SELECT i, i * i FROM generate_series(21, 30) i;
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SELECT sum(a), sum(b) FROM t;
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sum | sum
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-----+------
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465 | 9455
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(1 row)
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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count
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-------
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3
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(1 row)
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-- vacuum full should merge stripes together
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VACUUM FULL t;
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SELECT sum(a), sum(b) FROM t;
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sum | sum
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-----+------
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465 | 9455
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(1 row)
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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count
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-------
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1
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(1 row)
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-- test the case when all data cannot fit into a single stripe
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SET cstore.stripe_row_count TO 1000;
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INSERT INTO t SELECT i, 2 * i FROM generate_series(1,2500) i;
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SELECT sum(a), sum(b) FROM t;
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sum | sum
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---------+---------
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3126715 | 6261955
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(1 row)
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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count
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-------
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4
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(1 row)
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VACUUM FULL t;
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SELECT sum(a), sum(b) FROM t;
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sum | sum
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---------+---------
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3126715 | 6261955
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(1 row)
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SELECT count(*) FROM cstore.cstore_stripes a, pg_class b WHERE a.relfilenode=b.relfilenode AND b.relname='t';
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count
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-------
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3
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(1 row)
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-- VACUUM FULL doesn't reclaim dropped columns, but converts them to NULLs
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ALTER TABLE t DROP COLUMN a;
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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;
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stripe | attr | block | ?column? | ?column?
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--------+------+-------+----------+----------
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0 | 1 | 0 | f | f
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0 | 2 | 0 | f | f
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1 | 1 | 0 | f | f
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1 | 2 | 0 | f | f
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2 | 1 | 0 | f | f
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2 | 2 | 0 | f | f
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(6 rows)
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VACUUM FULL t;
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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;
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stripe | attr | block | ?column? | ?column?
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--------+------+-------+----------+----------
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0 | 1 | 0 | t | t
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0 | 2 | 0 | f | f
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1 | 1 | 0 | t | t
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1 | 2 | 0 | f | f
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2 | 1 | 0 | t | t
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2 | 2 | 0 | f | f
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(6 rows)
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