Account for filters in DecompressChunk row estimates #6563
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We don't account for them at all currently, which leads to weird planning behavior, like the filters not influencing the position of relations in join.
Codecov ReportAttention:
Additional details and impacted files@@ Coverage Diff @@
## main #6563 +/- ##
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- Coverage 79.73% 79.70% -0.04%
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Files 188 188
Lines 36768 36726 -42
Branches 9295 9280 -15
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- Hits 29318 29271 -47
- Misses 3112 3126 +14
+ Partials 4338 4329 -9 ☔ View full report in Codecov by Sentry. |
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akuzm
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Jan 25, 2024
Comment on lines
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| INSERT INTO mapc_test | ||
| SELECT time, device, device * 0.1 | ||
| FROM generate_series('2020-01-02'::timestamptz,'2020-01-18'::timestamptz,'6 hour') time, | ||
| generate_series(1,3) device; | ||
| FROM generate_series('2020-01-02'::timestamptz,'2020-01-15'::timestamptz,'4 second') time, | ||
| generate_series(1,10) device; |
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After adding the missed ANALYZE, I had to add much more rows to keep the old plans. Also renamed it to something less generic and removed the third chunk which doesn't really add coverage.
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@mkindahl, @antekresic: please review this pull request.
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2 tasks
svenklemm
approved these changes
Jan 25, 2024
antekresic
approved these changes
Jan 25, 2024
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We don't account for them at all currently, which leads to weird planning behavior, like the filters not influencing the position of relations in join. We don't normally have the statistics on uncompressed tables of compressed chunks, so these estimates will be using the Postgres defaults that are chosen based on the kind of filter.
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