[jira] [Resolved] (IMPALA-15415) Document the HBO features

["Sanjana Malhotra (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-15415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sanjana Malhotra resolved IMPALA-15415.
---------------------------------------
    Fix Version/s: Impala 5.0.0
       Resolution: Fixed

Thanks [~stigahuang] and [~alexandrefimov] for the review.

> Document the HBO features
> -------------------------
>
>                 Key: IMPALA-15415
>                 URL: https://issues.apache.org/jira/browse/IMPALA-15415
>             Project: IMPALA
>          Issue Type: Documentation
>            Reporter: Quanlong Huang
>            Assignee: Sanjana Malhotra
>            Priority: Major
>             Fix For: Impala 5.0.0
>
>
> We need documents to explain the HBO feature and relative flags, query options, and observability updates.
> Query options:
>  * use_hbo_stats
>  * store_hbo_stats
> Flags:
>  * hbo_similarity_threshold
>  * hbo_max_runs_per_key
>  * hbo_in_memory_backend_cache_size_bytes
> Observability updates:
>  * EXPLAIN output or query plan in the profile shows "from HBO" annotation if the cardinality is read from HBO cache.
>  * IMPALA-15236 extends this to add more details
> HBO is still an experimental feature and is working in progress. But it'd be nice to document it in the 5.0 release.



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