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b869f91e25
The schema of base table on which hypertables are created, should define columns with proper data types. As per postgres best practices Wiki (https://wiki.postgresql.org/wiki/Don't_Do_This), one should not define columns with CHAR, VARCHAR, VARCHAR(N), instead use TEXT data type. Similarly instead of using timestamp, one should use timestamptz. This patch reports a WARNING to end user when creating hypertables, if underlying parent table, has columns of above mentioned data types. Fixes #4335
60 lines
2.6 KiB
Plaintext
60 lines
2.6 KiB
Plaintext
-- This file and its contents are licensed under the Timescale License.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-TIMESCALE for a copy of the license.
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\c :TEST_DBNAME :ROLE_SUPERUSER
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-- We have different collation names such as en_US, en-US-x-icu and so on,
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-- that are available on different platforms.
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select * from (
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select 3 priority, 'en_US' "COLLATION"
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union all (select 2, collname from pg_collation where collname ilike 'en_us%' order by collname limit 1)
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union all (select 1, collname from pg_collation where collname ilike 'en_us_utf%8%' order by collname limit 1)
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) c
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order by priority limit 1 \gset
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create table compressed_collation_ht(time timestamp, name text collate :"COLLATION",
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value float);
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select create_hypertable('compressed_collation_ht', 'time');
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WARNING: column type "timestamp without time zone" used for "time" does not follow best practices
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NOTICE: adding not-null constraint to column "time"
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create_hypertable
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--------------------------------------
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(1,public,compressed_collation_ht,t)
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(1 row)
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alter table compressed_collation_ht set (timescaledb.compress,
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timescaledb.compress_segmentby = 'name', timescaledb.compress_orderby = 'time');
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insert into compressed_collation_ht values ('2021-01-01 01:01:01', 'á', '1'),
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('2021-01-01 01:01:02', 'b', '2'), ('2021-01-01 01:01:03', 'ç', '2');
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select 1 from (
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select compress_chunk(chunk_schema || '.' || chunk_name)
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from timescaledb_information.chunks
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where hypertable_name = 'compressed_collation_ht'
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) t;
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?column?
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----------
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1
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(1 row)
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select ht.schema_name || '.' || ht.table_name as "CHUNK"
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from _timescaledb_catalog.hypertable ht
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inner join _timescaledb_catalog.hypertable ht2
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on ht.id = ht2.compressed_hypertable_id
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and ht2.table_name = 'compressed_collation_ht' \gset
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create index on :CHUNK (name);
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set enable_seqscan to off;
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explain (costs off)
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select * from compressed_collation_ht order by name;
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------
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Custom Scan (DecompressChunk) on _hyper_1_1_chunk
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-> Index Scan using compress_hyper_2_2_chunk__compressed_hypertable_2_name_idx on compress_hyper_2_2_chunk
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(2 rows)
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select * from compressed_collation_ht order by name;
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time | name | value
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--------------------------+------+-------
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Fri Jan 01 01:01:01 2021 | á | 1
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Fri Jan 01 01:01:02 2021 | b | 2
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Fri Jan 01 01:01:03 2021 | ç | 2
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(3 rows)
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