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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