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Show batches/tuples decompressed in EXPLAIN output
This patch adds tracking number of batches and tuples that needed
to be decompressed as part of DML operations on compressed hypertables.
These will be visible in EXPLAIN ANALYZE output like so:
QUERY PLAN
Custom Scan (HypertableModify) (actual rows=0 loops=1)
Batches decompressed: 2
Tuples decompressed: 25
-> Insert on decompress_tracking (actual rows=0 loops=1)
-> Custom Scan (ChunkDispatch) (actual rows=2 loops=1)
-> Values Scan on "*VALUES*" (actual rows=2 loops=1)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| Implements: #6178 Show batches/tuples decompressed during DML operations in EXPLAIN output |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| -- This file and its contents are licensed under the Timescale License. | ||
| -- Please see the included NOTICE for copyright information and | ||
| -- LICENSE-TIMESCALE for a copy of the license. | ||
| \set EXPLAIN 'EXPLAIN (costs off,timing off,summary off)' | ||
| \set EXPLAIN_ANALYZE 'EXPLAIN (analyze,costs off,timing off,summary off)' | ||
| CREATE TABLE decompress_tracking(time timestamptz not null, device text, value float, primary key(time, device)); | ||
| SELECT table_name FROM create_hypertable('decompress_tracking','time'); | ||
| table_name | ||
| decompress_tracking | ||
| (1 row) | ||
|
|
||
| ALTER TABLE decompress_tracking SET (timescaledb.compress, timescaledb.compress_segmentby='device'); | ||
| INSERT INTO decompress_tracking SELECT '2020-01-01'::timestamptz + format('%s hour', g)::interval, 'd1', random() FROM generate_series(1,10) g; | ||
| INSERT INTO decompress_tracking SELECT '2020-01-01'::timestamptz + format('%s hour', g)::interval, 'd2', random() FROM generate_series(1,20) g; | ||
| INSERT INTO decompress_tracking SELECT '2020-01-01'::timestamptz + format('%s hour', g)::interval, 'd3', random() FROM generate_series(1,30) g; | ||
| SELECT count(compress_chunk(ch)) FROM show_chunks('decompress_tracking') ch; | ||
| count | ||
| 2 | ||
| (1 row) | ||
|
|
||
| -- no tracking without analyze | ||
| :EXPLAIN UPDATE decompress_tracking SET value = value + 3; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) | ||
| -> Update on decompress_tracking | ||
| Update on _hyper_X_X_chunk decompress_tracking_1 | ||
| Update on _hyper_X_X_chunk decompress_tracking_2 | ||
| -> Result | ||
| -> Append | ||
| -> Seq Scan on _hyper_X_X_chunk decompress_tracking_1 | ||
| -> Seq Scan on _hyper_X_X_chunk decompress_tracking_2 | ||
| (8 rows) | ||
|
|
||
| BEGIN; :EXPLAIN_ANALYZE UPDATE decompress_tracking SET value = value + 3; ROLLBACK; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) (actual rows=0 loops=1) | ||
| Batches decompressed: 5 | ||
| Tuples decompressed: 60 | ||
| -> Update on decompress_tracking (actual rows=0 loops=1) | ||
| Update on _hyper_X_X_chunk decompress_tracking_1 | ||
| Update on _hyper_X_X_chunk decompress_tracking_2 | ||
| -> Result (actual rows=60 loops=1) | ||
| -> Append (actual rows=60 loops=1) | ||
| -> Seq Scan on _hyper_X_X_chunk decompress_tracking_1 (actual rows=40 loops=1) | ||
| -> Seq Scan on _hyper_X_X_chunk decompress_tracking_2 (actual rows=20 loops=1) | ||
| (10 rows) | ||
|
|
||
| BEGIN; :EXPLAIN_ANALYZE DELETE FROM decompress_tracking; ROLLBACK; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) (actual rows=0 loops=1) | ||
| Batches decompressed: 5 | ||
| Tuples decompressed: 60 | ||
| -> Delete on decompress_tracking (actual rows=0 loops=1) | ||
| Delete on _hyper_X_X_chunk decompress_tracking_1 | ||
| Delete on _hyper_X_X_chunk decompress_tracking_2 | ||
| -> Append (actual rows=60 loops=1) | ||
| -> Seq Scan on _hyper_X_X_chunk decompress_tracking_1 (actual rows=40 loops=1) | ||
| -> Seq Scan on _hyper_X_X_chunk decompress_tracking_2 (actual rows=20 loops=1) | ||
| (9 rows) | ||
|
|
||
| BEGIN; :EXPLAIN_ANALYZE INSERT INTO decompress_tracking SELECT '2020-01-01 1:30','d1',random(); ROLLBACK; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) (actual rows=0 loops=1) | ||
| Batches decompressed: 1 | ||
| Tuples decompressed: 10 | ||
| -> Insert on decompress_tracking (actual rows=0 loops=1) | ||
| -> Custom Scan (ChunkDispatch) (actual rows=1 loops=1) | ||
| -> Subquery Scan on "*SELECT*" (actual rows=1 loops=1) | ||
| -> Result (actual rows=1 loops=1) | ||
| (7 rows) | ||
|
|
||
| BEGIN; :EXPLAIN_ANALYZE INSERT INTO decompress_tracking SELECT '2020-01-01','d2',random(); ROLLBACK; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) (actual rows=0 loops=1) | ||
| -> Insert on decompress_tracking (actual rows=0 loops=1) | ||
| -> Custom Scan (ChunkDispatch) (actual rows=1 loops=1) | ||
| -> Subquery Scan on "*SELECT*" (actual rows=1 loops=1) | ||
| -> Result (actual rows=1 loops=1) | ||
| (5 rows) | ||
|
|
||
| BEGIN; :EXPLAIN_ANALYZE INSERT INTO decompress_tracking SELECT '2020-01-01','d4',random(); ROLLBACK; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) (actual rows=0 loops=1) | ||
| -> Insert on decompress_tracking (actual rows=0 loops=1) | ||
| -> Custom Scan (ChunkDispatch) (actual rows=1 loops=1) | ||
| -> Subquery Scan on "*SELECT*" (actual rows=1 loops=1) | ||
| -> Result (actual rows=1 loops=1) | ||
| (5 rows) | ||
|
|
||
| BEGIN; :EXPLAIN_ANALYZE INSERT INTO decompress_tracking (VALUES ('2020-01-01 1:30','d1',random()),('2020-01-01 1:30','d2',random())); ROLLBACK; | ||
| QUERY PLAN | ||
| Custom Scan (HypertableModify) (actual rows=0 loops=1) | ||
| Batches decompressed: 2 | ||
| Tuples decompressed: 25 | ||
| -> Insert on decompress_tracking (actual rows=0 loops=1) | ||
| -> Custom Scan (ChunkDispatch) (actual rows=2 loops=1) | ||
| -> Values Scan on "*VALUES*" (actual rows=2 loops=1) | ||
| (6 rows) | ||
|
|
||
| DROP TABLE decompress_tracking; |
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