[jira] [Resolved] (IMPALA-872) Insert overwrite into a table does not erase previously computed stats.

["Alexander Behm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexander Behm resolved IMPALA-872.
-----------------------------------
    Resolution: Won't Fix

> Insert overwrite into a table does not erase previously computed stats.
> -----------------------------------------------------------------------
>
>                 Key: IMPALA-872
>                 URL: https://issues.apache.org/jira/browse/IMPALA-872
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Catalog
>    Affects Versions: Impala 1.3
>            Reporter: Ishaan Joshi
>            Assignee: Henry Robinson
>            Priority: Minor
>              Labels: compute-stats
>
> This can be reproduced with the following sequence of queries:
> {noformat}
> # Assume bar exists and is populated.
> create table foo like bar;
> insert overwrite foo select * from bar;
> compute stats foo;
> insert overwrite foo select * from bar
> show table/column stats foo;
> {noformat}
> The last query, instead of informing the user that stats are missing, shows the previously generated stats. 
> This is potentially very dangerous if a user neglects to recompute stats after overwriting a table for which stats had been computed prior to the overwrite.



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