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From "Zoltan Haindrich (JIRA)" <>
Subject [jira] [Commented] (HIVE-19995) Aggregate row traffic for acid tables
Date Tue, 26 Jun 2018 14:57:00 GMT


Zoltan Haindrich commented on HIVE-19995:

This is only about basic stats: like rowcount.
It seems  OrccRecordUpdater already provides rowCountDelta correctly (and it can be negative)
; so it will keep track of deletes as well - for free :D
I think this will probably work very reliably in general for acid tables.

> Aggregate row traffic for acid tables
> -------------------------------------
>                 Key: HIVE-19995
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Statistics, Transactions
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
> for transactional tables we store basic stats in case of explicit analyze/rewrite; but
doesn't do anything in other cases....which may even lead to plans which oom...
> It would be better to aggregate the total row traffic...because that is already available;
so that operator tree estimations could work with a real upper bound of the row numbers.

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