mirror of https://github.com/citusdata/citus.git
77 lines
2.2 KiB
SQL
77 lines
2.2 KiB
SQL
--
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-- Test different operations on empty columnar tables.
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--
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SET citus.compression to 'none';
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create table t_uncompressed(a int) using columnar;
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create table t_compressed(a int) using columnar;
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-- set options
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ALTER TABLE t_compressed SET (columnar.compression = pglz);
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ALTER TABLE t_compressed SET (columnar.stripe_row_limit = 2000);
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ALTER TABLE t_compressed SET (columnar.chunk_group_row_limit = 1000);
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SELECT * FROM columnar.options WHERE relation = 't_compressed'::regclass;
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-- select
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select * from t_uncompressed;
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select count(*) from t_uncompressed;
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select * from t_compressed;
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select count(*) from t_compressed;
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-- check storage
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select
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version_major, version_minor, reserved_stripe_id, reserved_row_number
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from columnar_test_helpers.columnar_storage_info('t_compressed');
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select
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version_major, version_minor, reserved_stripe_id, reserved_row_number
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from columnar_test_helpers.columnar_storage_info('t_uncompressed');
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-- explain
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explain (costs off, summary off, timing off) select * from t_uncompressed;
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explain (costs off, summary off, timing off) select * from t_compressed;
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-- vacuum
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vacuum verbose t_compressed;
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vacuum verbose t_uncompressed;
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-- vacuum full
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vacuum full t_compressed;
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vacuum full t_uncompressed;
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-- check storage
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select
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version_major, version_minor, reserved_stripe_id, reserved_row_number
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from columnar_test_helpers.columnar_storage_info('t_compressed');
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select
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version_major, version_minor, reserved_stripe_id, reserved_row_number
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from columnar_test_helpers.columnar_storage_info('t_uncompressed');
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-- analyze
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analyze t_uncompressed;
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analyze t_compressed;
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-- truncate
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truncate t_uncompressed;
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truncate t_compressed;
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-- alter type
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alter table t_uncompressed alter column a type text;
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alter table t_compressed alter column a type text;
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-- check storage
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select
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version_major, version_minor, reserved_stripe_id, reserved_row_number
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from columnar_test_helpers.columnar_storage_info('t_compressed');
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select
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version_major, version_minor, reserved_stripe_id, reserved_row_number
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from columnar_test_helpers.columnar_storage_info('t_uncompressed');
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-- verify cost of scanning an empty table is zero, not NaN
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explain table t_uncompressed;
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explain table t_compressed;
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-- drop
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drop table t_compressed;
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drop table t_uncompressed;
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