Gabor Kaszab created IMPALA-13296:
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Summary: 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
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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