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https://issues.apache.org/jira/browse/IMPALA-6090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-6090:
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Component/s: (was: Frontend)
Backend
> Default value for columns with schema evolution
> -----------------------------------------------
>
> Key: IMPALA-6090
> URL: https://issues.apache.org/jira/browse/IMPALA-6090
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend
> Reporter: Zsolt Herczeg
> Priority: Minor
>
> Currently, if a query references a column which is not present for a row,
> that row is silently ignored. In case of a schema evolution where new columns
> has been added, it's not possible to query the new columns and the old data
> at the same time.
> Impala could have a default value for each column, which is returned in case
> of that column is missing instead of ignoring the row. This would allow a
> single query to include the old data and contain the newly added columns
> where they're present.
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