Zoltán Borók-Nagy created IMPALA-11168:
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Summary: Add pseudo-columns for Impala
Key: IMPALA-11168
URL: https://issues.apache.org/jira/browse/IMPALA-11168
Project: IMPALA
Issue Type: Bug
Components: Backend, Frontend
Reporter: Zoltán Borók-Nagy
Hive Supports a few pseudo-column (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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