[jira] [Resolved] (IMPALA-11168) Add pseudo-columns for Impala

["Zoltán Borók-Nagy (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-11168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltán Borók-Nagy resolved IMPALA-11168.
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    Fix Version/s: Impala 4.2.0
       Resolution: Duplicate

> Add pseudo-columns for Impala
> -----------------------------
>
>                 Key: IMPALA-11168
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11168
>             Project: IMPALA
>          Issue Type: New Feature
>          Components: Backend, Frontend
>            Reporter: Zoltán Borók-Nagy
>            Priority: Major
>             Fix For: Impala 4.2.0
>
>
> Hive supports a few pseudo-columns (virtual column):
> [https://cwiki.apache.org/confluence/display/hive/languagemanual+virtualcolumns]
> It would be useful to add support for a few pseudo-columns for Impala as well.
> E.g. to implement support for Iceberg position-based deletes we'd need the file name and ordinal position for each row.
> Hive has {{INPUT_\_FILE_\_NAME}} which returns full URI of the data file. Unfortunately it doesn't have a pseudo-column for the ordinal position of rows. So we need to introduce a new pseudo-column for that, probably with the name {{ORDINAL_\_POSITION_\_INSIDE_\_FILE}}, or stg. like that.



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