[jira] [Updated] (IMPALA-10936) StmtMetadataLoader::collectPolicyTables() should handle FailedLoadLocalTable without NPE

["Quanlong Huang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-10936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang updated IMPALA-10936:
------------------------------------
    Priority: Critical  (was: Major)

> StmtMetadataLoader::collectPolicyTables() should handle FailedLoadLocalTable without NPE
> ----------------------------------------------------------------------------------------
>
>                 Key: IMPALA-10936
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10936
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Frontend
>    Affects Versions: Impala 4.1.0
>            Reporter: Joe McDonnell
>            Assignee: Quanlong Huang
>            Priority: Critical
>
> If table loading fails, then it result in a FailedLoadLocalTable, which uses this constructor for LocalTable:
> {noformat}
>   protected LocalTable(LocalDb db, String tblName) {
>     this.db_ = Preconditions.checkNotNull(db);
>     this.name_ = tblName;
>     this.ref_ = null;
>     this.msTable_ = null;
>     this.cols_ = null;
>     this.tableStats_ = null;
>   }{noformat}
> Since cols_ and other fields are null, the code in StmtMetadataLoader::collectPolicyTables(), which calls LocalTable::getColumnsInHiveOrder() will throw a NullPointerException when trying to access cols_ in getNonClusteringColumns(). 
> This will fail the query with a NullPointerException, even though the underlying problem came from failing to load the table metadata. We should handle this to avoid the NullPointerException. That may happen as part of StmtMetadataLoader::collectPolicyTables() or StmtMetadataLoader::getMissingTables().



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