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https://issues.apache.org/jira/browse/IMPALA-8797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952227#comment-16952227
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Alexandra Rodoni commented on IMPALA-8797:
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[~stigahuang] Is this a user-facing flag that should be documented?
> Blacklist "sys" and "information_schema" databases from Hive
> ------------------------------------------------------------
>
> Key: IMPALA-8797
> URL: https://issues.apache.org/jira/browse/IMPALA-8797
> Project: IMPALA
> Issue Type: Improvement
> Components: Catalog, Frontend
> Affects Versions: Impala 3.2.0
> Reporter: Bharath Vissapragada
> Assignee: Quanlong Huang
> Priority: Critical
> Fix For: Impala 3.4.0
>
>
> HMS exposes these two databases "sys" and "information_schema" which contain
> tables that expose the underlying meta information in a queryable format.
> However, Impala cannot read them because they come with custom serde that
> Impala doesn't support.
> From a usability point of view, we should black list those databases from
> loading, so that users don't see them when querying the database list. I
> think that is reasonable because they can't query them anyway.
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