Daniel Becker created IMPALA-12845:
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Summary: Crash with DESCRIBE on a struct from an Iceberg table
Key: IMPALA-12845
URL: https://issues.apache.org/jira/browse/IMPALA-12845
Project: IMPALA
Issue Type: Bug
Reporter: Daniel Becker
Assignee: Daniel Becker
A DESCRIBE statement on a struct contained in an Iceberg table crashes Impala:
In Hive:
{code:java}
create table ice_struct (id INT, s STRUCT<i: INT>) stored by iceberg;{code}
In Impala:
{code:java}
describe ice_struct.s
Caught exception TSocket read 0 bytes, type=<class
'thrift.transport.TTransport.TTransportException'> in FetchResults.
Error communicating with impalad: TSocket read 0 bytes{code}
The logs in impalad.FATAL indicate that we hit a DCHECK:
{code:java}
F0227 11:53:49.936864 680819 query-result-set.cc:386] Check failed: num_col ==
metadata_.columns.size() (3 vs. 4){code}
Note that this also happens with Iceberg metadata tables, for example:
{code:java}
describe
functional_parquet.iceberg_query_metadata.entries.readable_metrics;{code}
With non-Iceberg tables there is no error.
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