Gabor Kaszab created IMPALA-12457:
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Summary: Conversion from non-supported column types for Iceberg
tables
Key: IMPALA-12457
URL: https://issues.apache.org/jira/browse/IMPALA-12457
Project: IMPALA
Issue Type: New Feature
Components: Frontend
Reporter: Gabor Kaszab
Assume you have a Hive table with one VARCHAR(N) column. The following now
fails:
CREATE TABLE ice_tbl STORED AS ICEBERG AS SELECT * FROM hive_tbl;
Fails because varchar(N) is not a supported Iceberg column type. Note, simple
varchar works because it's just a string under the hood.
I think this behaviour is just fine, Hive also gives an error for the above,
however, Hive has a switch called 'iceberg.mr.schema.auto.conversion' that when
you turn on Hive would do a conversion into string for varchar(N)
automatically. Also smallint and tinyint could be converted into int.
Would be nice to have something similar in Impala.
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