Tianyi Wang resolved IMPALA-6820.
       Resolution: Fixed
    Fix Version/s: Impala 3.1.0

> Remove builtins db from catalogd
> --------------------------------
>                 Key: IMPALA-6820
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6820
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Catalog
>    Affects Versions: Impala 2.13.0, Impala 3.1.0
>            Reporter: Tianyi Wang
>            Assignee: Tianyi Wang
>            Priority: Minor
>             Fix For: Impala 3.1.0
> Currently builtins_db is created in the catalogd initialization. But later on 
> when catalogd calls reset(), catalogd will replace its dbCache with DBs from 
> HMS. As a result, a delete builtins_db operation is always in the initial 
> catalog update sent to statestore. Though statestore doesn't send it to 
> impalad because the initial catalog is not a delta and doesn't include delete 
> operations, it's a potential problem. We should remove builtins db from 
> catalogd because it's not needed there. 

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