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GreptimeTeam / greptimedb

An open-source, cloud-native, unified time series database for metrics, logs and events with SQL/PromQL supported. Available on GreptimeCloud.
https://greptime.com/
Apache License 2.0
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feat: reimplement limit in PartSort to reduce memory footprint #5018

Closed waynexia closed 2 days ago

waynexia commented 3 days ago

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

Closes https://github.com/GreptimeTeam/greptimedb/issues/4959

What's changed and what's your intention?

Use TopK buffer to leverage a heap-based limit implementation which should greatly reduce the memory footprint

Checklist

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codecov[bot] commented 3 days ago

Codecov Report

Attention: Patch coverage is 91.89189% with 12 lines in your changes missing coverage. Please review.

Project coverage is 83.75%. Comparing base (73e6bf3) to head (bd5f9e9). Report is 10 commits behind head on main.

Additional details and impacted files ```diff @@ Coverage Diff @@ ## main #5018 +/- ## ========================================== - Coverage 84.01% 83.75% -0.26% ========================================== Files 1149 1149 Lines 214254 215125 +871 ========================================== + Hits 179995 180180 +185 - Misses 34259 34945 +686 ```

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