[jira] [Commented] (HIVE-23965) Improve plan regression tests using TPCDS30TB metastore dump and custom configs

["Stamatis Zampetakis (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-23965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169040#comment-17169040 ] 

Stamatis Zampetakis commented on HIVE-23965:
--------------------------------------------

One thing that I am wondering is if it is worth keeping the old perf CLI driver. Let me know what you think.

> Improve plan regression tests using TPCDS30TB metastore dump and custom configs
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-23965
>                 URL: https://issues.apache.org/jira/browse/HIVE-23965
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Stamatis Zampetakis
>            Assignee: Stamatis Zampetakis
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The existing regression tests (HIVE-12586) based on TPC-DS have certain shortcomings:
> The table statistics do not reflect cardinalities from a specific TPC-DS scale factor (SF). Some tables are from a 30TB dataset, others from 200GB dataset, and others from a 3GB dataset. This mix leads to plans that may never appear when using an actual TPC-DS dataset. 
> The existing statistics do not contain information about partitions something that can have a big impact on the resulting plans.
> The existing regression tests rely on more or less on the default configuration (hive-site.xml). In real-life scenarios though some of the configurations differ and may impact the choices of the optimizer.
> This issue aims to address the above shortcomings by using a curated TPCDS30TB metastore dump along with some custom hive configurations. 



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