[Impala-ASF-CR] IMPALA-9249: Fix ORC scanner crash when root type is not struct

["Csaba Ringhofer (Code Review)" <ge...@cloudera.org>]

Hello Quanlong Huang, Impala Public Jenkins, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/15021

to look at the new patch set (#3).

Change subject: IMPALA-9249: Fix ORC scanner crash when root type is not struct
......................................................................

IMPALA-9249: Fix ORC scanner crash when root type is not struct

The root type should be struct as far as I know, and this was
checked with a DCHECK, leading to crashes in fuzz tests. This
change replaced the DCHECK with returning an error message.

Testing:
- added corrupt ORC file and e2e test

Change-Id: I7fba8cffbcdf8f647e27e2d5ee9e6716a4492b9b
---
M be/src/exec/hdfs-orc-scanner.cc
M be/src/exec/orc-metadata-utils.cc
M be/src/exec/orc-metadata-utils.h
M testdata/data/README
A testdata/data/corrupt_root_type.orc
M tests/query_test/test_scanners.py
6 files changed, 43 insertions(+), 24 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/21/15021/3
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I7fba8cffbcdf8f647e27e2d5ee9e6716a4492b9b
Gerrit-Change-Number: 15021
Gerrit-PatchSet: 3
Gerrit-Owner: Csaba Ringhofer <cs...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Quanlong Huang <hu...@gmail.com>