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0ab2d39f25
We don't do this currently, so some queries return the wrong ordering of rows if there is an index on the compressed chunk. The fix only works for the newly created chunks. We could add a migration that corrects the old compressed chunks, but it seems to be too heavy and not to lend itself well to automation -- we'll have to recreate the indexes if there are any. So the old chunks continue to return a wrong result.
47 lines
1.7 KiB
SQL
47 lines
1.7 KiB
SQL
-- 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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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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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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select * from compressed_collation_ht order by name;
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