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https://issues.apache.org/jira/browse/IMPALA-9625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fang-Yu Rao resolved IMPALA-9625.
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Resolution: Fixed
> Impala's COMPUTE STATS statement generates duplicate ALTER events
> -----------------------------------------------------------------
>
> Key: IMPALA-9625
> URL: https://issues.apache.org/jira/browse/IMPALA-9625
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: Fang-Yu Rao
> Assignee: Fang-Yu Rao
> Priority: Critical
>
> Impala's COMPUTE STATS statement results in the registration of the ALTER
> event twice. One is in {{Analyzer#registerAuthAndAuditEvent()}} at
> [https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/analysis/Analyzer.java#L3131-L3133]
> and the other is in {{Analyzer#getTable()}} at
> [https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/analysis/Analyzer.java#L2862-L2863].
> In {{registerAuthAndAuditEvent()}}, the corresponding full table name
> {{table.getFullName()}} is produced by a call to
> {{Analyzer#resolveTableRef()}}
> ([https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/analysis/ComputeStatsStmt.java#L352]).
> The resulting database and table names are both in lowercase.
> However, in {{getTable()}}, the fully-qualified table name is produce by a
> call to {{Analyzer#getFqTableName()}} at
> [https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/analysis/Analyzer.java#L2836].
> The resulting database and table names are in their originally unconverted
> form provided by the user from the Impala shell. Hence, there is no guarantee
> that the database and table names are both in lowercase.
> Therefore, if a user does not provide lowercase database and table names, the
> returned full table name from {{registerAuthAndAuditEvent()}} and
> {{getTable()}} would differ, resulting in duplicate ALTER events for the same
> table.
> We should at least make the full table name consistent every time when we
> register such an audit event to avoid duplicate entries in the log.
>
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