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