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Posted to issues-all@impala.apache.org by "Aleksandr Efimov (Jira)" <ji...@apache.org> on 2026/06/03 10:02:00 UTC
[jira] [Commented] (IMPALA-14596) History Based Optimizer
[ https://issues.apache.org/jira/browse/IMPALA-14596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18085759#comment-18085759 ]
Aleksandr Efimov commented on IMPALA-14596:
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Hi [~stigahuang], I was looking through the HBO/profile-related backlog for places where I might help without duplicating active work.
The candidates that look most suitable are:
- IMPALA-14941: ExecSummary shows 0 output rows under SUBPLAN node. It is assigned, but I did not find an active Gerrit review, so I wanted to check whether it is stalled or still planned.
- IMPALA-15037: Add a profile counter to show HBO stats read duration. This looks profile-facing and relatively focused.
- IMPALA-14846: HBO for KuduScanNode and HBaseScanNode cardinality. This is unassigned and older, though probably broader.
If one of these would be useful to pick up, I can start with a small preflight/reproducer and focused tests before proposing a patch. Otherwise I'll avoid anything that is already in your active queue.
> History Based Optimizer
> -----------------------
>
> Key: IMPALA-14596
> URL: https://issues.apache.org/jira/browse/IMPALA-14596
> Project: IMPALA
> Issue Type: Epic
> Components: Backend, Frontend
> Reporter: Quanlong Huang
> Assignee: Quanlong Huang
> Priority: Critical
>
> Impala has detailed query profiles which help users to fine-tune the queries (using query options or query hints). These infomation can actually be used by Impala itself in planning new queries, e.g. fixing wrong estimation, bad join order, useless runtime filters, etc.
> This Epic tracks the work of adding History Based Optimizer for Impala.
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