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https://github.com/timescale/timescaledb.git
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676d1fb1f1
The code we inherited from postgres expects that if we have a const null or false clause, it's going to be the single one, but that's not true for runtime chunk exclusion because we don't try to fold such restrictinfos after evaluating the mutable functions. Fix it to also work for multiple restrictinfos.
127 lines
6.9 KiB
Plaintext
127 lines
6.9 KiB
Plaintext
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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create table metrics(ts timestamp, id int, value float);
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select create_hypertable('metrics', 'ts');
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WARNING: column type "timestamp without time zone" used for "ts" does not follow best practices
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NOTICE: adding not-null constraint to column "ts"
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create_hypertable
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----------------------
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(1,public,metrics,t)
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(1 row)
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insert into metrics values ('2022-02-02 02:02:02', 2, 2.),
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('2023-03-03 03:03:03', 3, 3.);
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analyze metrics;
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-- non-const condition
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explain (analyze, costs off, summary off, timing off)
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select * from metrics
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where ts >= (select max(ts) from metrics);
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------------------------------------------
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Custom Scan (ChunkAppend) on metrics (actual rows=1 loops=1)
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Chunks excluded during runtime: 1
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InitPlan 2 (returns $1)
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-> Result (actual rows=1 loops=1)
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InitPlan 1 (returns $0)
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-> Limit (actual rows=1 loops=1)
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-> Custom Scan (ChunkAppend) on metrics metrics_1 (actual rows=1 loops=1)
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Order: metrics_1.ts DESC
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-> Index Only Scan using _hyper_1_2_chunk_metrics_ts_idx on _hyper_1_2_chunk _hyper_1_2_chunk_1 (actual rows=1 loops=1)
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Index Cond: (ts IS NOT NULL)
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Heap Fetches: 1
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-> Index Only Scan using _hyper_1_1_chunk_metrics_ts_idx on _hyper_1_1_chunk _hyper_1_1_chunk_1 (never executed)
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Index Cond: (ts IS NOT NULL)
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Heap Fetches: 0
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-> Seq Scan on _hyper_1_1_chunk (never executed)
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Filter: (ts >= $1)
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-> Seq Scan on _hyper_1_2_chunk (actual rows=1 loops=1)
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Filter: (ts >= $1)
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(18 rows)
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-- two non-const conditions
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explain (analyze, costs off, summary off, timing off)
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select * from metrics
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where ts >= (select max(ts) from metrics)
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and id = 1;
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QUERY PLAN
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--------------------------------------------------------------------------------------------------------------------------------------------------
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Custom Scan (ChunkAppend) on metrics (actual rows=0 loops=1)
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Chunks excluded during runtime: 1
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InitPlan 2 (returns $1)
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-> Result (actual rows=1 loops=1)
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InitPlan 1 (returns $0)
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-> Limit (actual rows=1 loops=1)
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-> Custom Scan (ChunkAppend) on metrics metrics_1 (actual rows=1 loops=1)
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Order: metrics_1.ts DESC
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-> Index Only Scan using _hyper_1_2_chunk_metrics_ts_idx on _hyper_1_2_chunk _hyper_1_2_chunk_1 (actual rows=1 loops=1)
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Index Cond: (ts IS NOT NULL)
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Heap Fetches: 1
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-> Index Only Scan using _hyper_1_1_chunk_metrics_ts_idx on _hyper_1_1_chunk _hyper_1_1_chunk_1 (never executed)
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Index Cond: (ts IS NOT NULL)
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Heap Fetches: 0
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-> Seq Scan on _hyper_1_1_chunk (never executed)
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Filter: ((ts >= $1) AND (id = 1))
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-> Seq Scan on _hyper_1_2_chunk (actual rows=0 loops=1)
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Filter: ((ts >= $1) AND (id = 1))
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Rows Removed by Filter: 1
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(19 rows)
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-- condition that becomes const null after evaluating the param
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explain (analyze, costs off, summary off, timing off)
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select * from metrics
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where ts >= (select max(ts) from metrics where id = -1);
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------------------------------------
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Custom Scan (ChunkAppend) on metrics (actual rows=0 loops=1)
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Chunks excluded during runtime: 2
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InitPlan 2 (returns $1)
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-> Result (actual rows=1 loops=1)
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InitPlan 1 (returns $0)
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-> Limit (actual rows=0 loops=1)
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-> Custom Scan (ChunkAppend) on metrics metrics_1 (actual rows=0 loops=1)
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Order: metrics_1.ts DESC
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-> Index Scan using _hyper_1_2_chunk_metrics_ts_idx on _hyper_1_2_chunk _hyper_1_2_chunk_1 (actual rows=0 loops=1)
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Index Cond: (ts IS NOT NULL)
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Filter: (id = '-1'::integer)
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Rows Removed by Filter: 1
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-> Index Scan using _hyper_1_1_chunk_metrics_ts_idx on _hyper_1_1_chunk _hyper_1_1_chunk_1 (actual rows=0 loops=1)
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Index Cond: (ts IS NOT NULL)
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Filter: (id = '-1'::integer)
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Rows Removed by Filter: 1
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-> Seq Scan on _hyper_1_1_chunk (never executed)
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Filter: (ts >= $1)
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-> Seq Scan on _hyper_1_2_chunk (never executed)
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Filter: (ts >= $1)
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(20 rows)
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-- const null condition and some other condition
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explain (analyze, costs off, summary off, timing off)
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select * from metrics
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where ts >= (select max(ts) from metrics where id = -1)
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and id = 1;
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QUERY PLAN
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---------------------------------------------------------------------------------------------------------------------------------------------
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Custom Scan (ChunkAppend) on metrics (actual rows=0 loops=1)
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Chunks excluded during runtime: 2
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InitPlan 2 (returns $1)
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-> Result (actual rows=1 loops=1)
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InitPlan 1 (returns $0)
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-> Limit (actual rows=0 loops=1)
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-> Custom Scan (ChunkAppend) on metrics metrics_1 (actual rows=0 loops=1)
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Order: metrics_1.ts DESC
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-> Index Scan using _hyper_1_2_chunk_metrics_ts_idx on _hyper_1_2_chunk _hyper_1_2_chunk_1 (actual rows=0 loops=1)
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Index Cond: (ts IS NOT NULL)
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Filter: (id = '-1'::integer)
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Rows Removed by Filter: 1
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-> Index Scan using _hyper_1_1_chunk_metrics_ts_idx on _hyper_1_1_chunk _hyper_1_1_chunk_1 (actual rows=0 loops=1)
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Index Cond: (ts IS NOT NULL)
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Filter: (id = '-1'::integer)
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Rows Removed by Filter: 1
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-> Seq Scan on _hyper_1_1_chunk (never executed)
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Filter: ((ts >= $1) AND (id = 1))
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-> Seq Scan on _hyper_1_2_chunk (never executed)
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Filter: ((ts >= $1) AND (id = 1))
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(20 rows)
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