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https://issues.apache.org/jira/browse/IMPALA-13296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Csaba Ringhofer resolved IMPALA-13296.
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Fix Version/s: Impala 4.5.0
Resolution: Fixed
> Hive to Iceberg table-migration: pre-check column compatibility
> ---------------------------------------------------------------
>
> Key: IMPALA-13296
> URL: https://issues.apache.org/jira/browse/IMPALA-13296
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Reporter: Gabor Kaszab
> Assignee: Gabor Kaszab
> Priority: Major
> Labels: impala-iceberg
> Fix For: Impala 4.5.0
>
>
> The table migration from a Hive table to an Iceberg table is a multi-step
> process that has a middle step to rename the original table to a temp name.
> If a later step fails the user gets an error but the table remains renamed
> (the user also gets a hint how to set the original name back).
> When the failure is column incompatibility (e.g. Iceberg doesn't support
> Hive's smallint, tinyint, varchar( n ) column types) we can do better because
> this imcompatibility could also be found during query analysis. That way the
> error could be sent before we rename the table. This results in a cleaner
> user experience.
> {code:java}
> Query: alter table hive_tbl convert to iceberg ERROR:
> IllegalArgumentException: Unsupported Hive type: VARCHAR, use string instead
> Your table might have been renamed. To reset the name try running: ALTER
> TABLE default.hive_tbl_tmp_8fb36dff RENAME TO default.hive_tbl;
> {code}
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