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Posted to issues-all@impala.apache.org by "Zoltán Borók-Nagy (Jira)" <ji...@apache.org> on 2021/10/19 12:22:00 UTC

[jira] [Created] (IMPALA-10974) Impala cannot resolve columns of converted Iceberg table

Zoltán Borók-Nagy created IMPALA-10974:
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             Summary: Impala cannot resolve columns of converted Iceberg table
                 Key: IMPALA-10974
                 URL: https://issues.apache.org/jira/browse/IMPALA-10974
             Project: IMPALA
          Issue Type: Bug
            Reporter: Zoltán Borók-Nagy


When a regular Parquet/ORC table is converted to Iceberg via Hive, only the Iceberg metadata files need to be created. The data files can stay in place.

This causes problems when the data files don't have field ids for the schema elements. Currently Impala resolves columns in data files based on Iceberg field ids, but since they are missing, Impala raises an error or returns NULLs.

We could fallback to the default column resolution strategy when the data files lack field ids.



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