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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2020/03/02 02:50:00 UTC
[jira] [Updated] (IMPALA-9410) Support resolving ORC file columns
by names
[ https://issues.apache.org/jira/browse/IMPALA-9410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Quanlong Huang updated IMPALA-9410:
-----------------------------------
Issue Type: New Feature (was: Bug)
> Support resolving ORC file columns by names
> -------------------------------------------
>
> Key: IMPALA-9410
> URL: https://issues.apache.org/jira/browse/IMPALA-9410
> Project: IMPALA
> Issue Type: New Feature
> Reporter: Quanlong Huang
> Priority: Major
>
> Currently we resolve ORC file columns by indices. We should provide an query option like PARQUET_FALLBACK_SCHEMA_RESOLUTION for Parquet (IMPALA-2835), to resolve ORC file columns by names.
> Note that Hive only writes column names to ORC files after Hive-2.x (HIVE-4243). For older versions of Hive, the column names in ORC files are something like _col0, _col1,....,_col99. So this feature is only required when deployed with Hive 2+.
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