[Backport 2.x] Time series based workload desc order optimization through reverse se… #7457
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…gment read (opensearch-project#7244) This commit changes the EngineConfig for timeseries indexes only (e.g., indexes that use the @timestamp metadata field) so that a descending LeafSorter comparator is used to visit segments in order of most newest to oldest. For the more infrequent case that a user chooses to sort query results by ASC time, this would cause a search regression so the ContextIndexSearcher is updated to inspect the sort order from the search request and reverse the comparator so segments are visited in ascending order. LeafSorter behavior for non-timeseries indexes is left the same. Signed-off-by: gashutos <gashutos@amazon.com> Signed-off-by: Chaitanya Gohel <104654647+gashutos@users.noreply.github.com>
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Codecov Report
📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more @@ Coverage Diff @@
## 2.x #7457 +/- ##
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- Coverage 70.29% 70.28% -0.02%
+ Complexity 59898 59829 -69
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Files 4873 4873
Lines 288130 288170 +40
Branches 41885 41897 +12
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- Hits 202542 202530 -12
- Misses 68607 68623 +16
- Partials 16981 17017 +36
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reta
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May 8, 2023
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Backport of #7244