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

["Joe McDonnell (Jira)" <ji...@apache.org>]

Joe McDonnell created IMPALA-10936:
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             Summary: 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


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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