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https://github.com/timescale/timescaledb.git
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b38c920266
This patch does following: 1. Planner changes to create ChunkDispatch node when MERGE command has INSERT action. 2. Changes to map partition attributes from a tuple returned from child node of ChunkDispatch against physical targetlist, so that ChunkDispatch node can read the correct value from partition column. 3. Fixed issues with MERGE on compressed hypertable. 4. Added more testcases. 5. MERGE in distributed hypertables is not supported. 6. Since there is no Custom Scan (HypertableModify) node for MERGE with UPDATE/DELETE on compressed hypertables, we don't support this. Fixes #5139
102 lines
4.0 KiB
SQL
102 lines
4.0 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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CREATE TABLE target (
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time TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP NOT NULL,
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value DOUBLE PRECISION NOT NULL,
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series_id BIGINT NOT NULL,
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partition_column TIMESTAMPTZ NOT NULL
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);
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SELECT table_name FROM create_hypertable(
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'target'::regclass,
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'partition_column'::name, chunk_time_interval=>interval '8 hours',
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create_default_indexes=> false);
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-- enable compression
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ALTER TABLE target SET (
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timescaledb.compress,
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timescaledb.compress_segmentby = 'series_id',
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timescaledb.compress_orderby = 'partition_column, value'
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);
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SELECT '2022-10-10 14:33:44.1234+05:30' as start_date \gset
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INSERT INTO target (series_id, value, partition_column)
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SELECT s,1,t from generate_series(:'start_date'::timestamptz, :'start_date'::timestamptz + interval '1 day', '5m') t cross join
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generate_series(1,3, 1) s;
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-- compress chunks
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SELECT count(compress_chunk(c.schema_name|| '.' || c.table_name))
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FROM _timescaledb_catalog.chunk c, _timescaledb_catalog.hypertable ht where
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c.hypertable_id = ht.id and ht.table_name = 'target' and c.compressed_chunk_id IS NULL;
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CREATE TABLE source (
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time TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP NOT NULL,
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value DOUBLE PRECISION NOT NULL,
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series_id BIGINT NOT NULL
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);
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SELECT table_name FROM create_hypertable(
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'source'::regclass,
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'time'::name, chunk_time_interval=>interval '6 hours',
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create_default_indexes=> false);
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SELECT '2022-10-10 10:00:00.0123+05:30' as start_date \gset
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INSERT INTO source (time, series_id, value)
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SELECT t, s,1 from generate_series(:'start_date'::timestamptz, :'start_date'::timestamptz + interval '1 day', '5m') t cross join
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generate_series(1,2, 1) s;
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\set ON_ERROR_STOP 0
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-- Merge UPDATE on compressed hypertables should report error
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MERGE INTO target t
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USING source s
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ON t.value = s.value AND t.series_id = s.series_id
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WHEN MATCHED THEN
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UPDATE SET series_id = (t.series_id * 0.123);
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-- Merge DELETE on compressed hypertables should report error
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MERGE INTO target t
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USING source s
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ON t.value = s.value AND t.series_id = s.series_id
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WHEN MATCHED THEN
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DELETE;
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-- Merge UPDATE/INSERT on compressed hypertables should report error
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MERGE INTO target t
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USING source s
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ON t.value = s.value AND t.series_id = s.series_id
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WHEN MATCHED THEN
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UPDATE SET series_id = (t.series_id * 0.123)
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WHEN NOT MATCHED THEN
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INSERT VALUES ('2021-11-01 00:00:05'::timestamp with time zone, 5, 210, '2021-11-01 00:00:05'::timestamp with time zone);
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-- Merge DELETE/INSERT on compressed hypertables should report error
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MERGE INTO target t
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USING source s
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ON t.value = s.value AND t.series_id = s.series_id
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WHEN MATCHED THEN
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DELETE
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WHEN NOT MATCHED THEN
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INSERT VALUES ('2021-11-01 00:00:05'::timestamp with time zone, 5, 210, '2021-11-01 00:00:05'::timestamp with time zone);
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\set ON_ERROR_STOP 1
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-- total compressed chunks
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SELECT count(*) AS "total compressed_chunks", is_compressed FROM timescaledb_information.chunks WHERE
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hypertable_name = 'target' GROUP BY is_compressed;
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-- Merge INSERT on compressed hypertables should work
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MERGE INTO target t
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USING source s
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ON t.partition_column = s.time AND t.value = s.value
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WHEN NOT MATCHED THEN
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INSERT VALUES ('2021-11-01 00:00:05'::timestamp with time zone, 5, 210, '2021-11-01 00:00:05'::timestamp with time zone);
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-- you should notice 1 uncompressed chunk
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SELECT count(*) AS "total compressed_chunks", is_compressed FROM timescaledb_information.chunks WHERE
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hypertable_name = 'target' GROUP BY is_compressed;
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DROP TABLE target;
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DROP TABLE source;
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