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Posted to issues-all@impala.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2022/07/07 07:25:00 UTC
[jira] [Commented] (IMPALA-11344) Selecting only the missing fields of ORC files should return NULLs
[ https://issues.apache.org/jira/browse/IMPALA-11344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563605#comment-17563605 ]
ASF subversion and git services commented on IMPALA-11344:
----------------------------------------------------------
Commit 5f2e8ddd9d162023665bfd7ff1429bd91dfcbd50 in impala's branch refs/heads/master from ttttttz
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=5f2e8ddd9 ]
IMPALA-11344: Missing slots in all cases should be allowed to be read
When selecting only the missing fields of ORC files and the missing fields
contain non-partition fields, the query will fail due to `Parse error in
possibly corrupt ORC file: '$filename'. No columns found for this scan`.
We should allow read missing slots in all cases.
Testing:
- Added a test to test_scanners.py that ensures the query can be
executed successfully when selecting only the missing fields of
ORC files.
Change-Id: I15dca47ba5f7a93bfd5fcba3cab4ac6d64459023
Reviewed-on: http://gerrit.cloudera.org:8080/18652
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
> Selecting only the missing fields of ORC files should return NULLs
> ------------------------------------------------------------------
>
> Key: IMPALA-11344
> URL: https://issues.apache.org/jira/browse/IMPALA-11344
> Project: IMPALA
> Issue Type: Bug
> Reporter: Quanlong Huang
> Assignee: zhi tang
> Priority: Critical
> Labels: newbie, ramp-up
>
> While looking into the bug of IMPALA-11296, I found a bug on the same scenario (scanning only the missing columns of ORC files) in current master branch.
> Creating an ORC table with missing fields in the underlying files:
> {code:sql}
> hive> create external table missing_field_orc (f0 int) stored as orc;
> hive> insert into table missing_field_orc select 1;
> hive> alter table missing_field_orc add columns (f1 int);
> hive> select f1 from missing_field_orc;
> +-------+
> | f1 |
> +-------+
> | NULL |
> +-------+
> hive> select f0, f1 from missing_field_orc;
> +-----+-------+
> | f0 | f1 |
> +-----+-------+
> | 1 | NULL |
> +-----+-------+
> {code}
> Run the same queries in Impala:
> {code:sql}
> impala> VERSION;
> Shell version: impala shell build version not available
> Server version: impalad version 4.2.0-SNAPSHOT DEBUG (build 7273cfdfb901b9ef564c2737cf00c7a8abb57f07)
> impala> invalidate metadata missing_field_orc;
> impala> select f1 from missing_field_orc;
> ERROR: Parse error in possibly corrupt ORC file: 'hdfs://localhost:20500/test-warehouse/missing_field_orc/000000_0'. No columns found for this scan.
> impala> select f0, f1 from missing_field_orc;
> +----+------+
> | f0 | f1 |
> +----+------+
> | 1 | NULL |
> +----+------+
> {code}
> While selecting only the column 'f1', the query failed by an error. It should return NULL.
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