Tamas Mate created IMPALA-12853:
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Summary: Collection types in FROM clause for Iceberg Metadata
Tables
Key: IMPALA-12853
URL: https://issues.apache.org/jira/browse/IMPALA-12853
Project: IMPALA
Issue Type: Bug
Reporter: Tamas Mate
Iceberg Metadata Table Collection types are not supported in from clause,
therefore it is not possible to use 'item' or 'pos' in case of arrays for
example.
Example query:
{code:java}
select delete_ids.item
from functional_parquet.iceberg_query_metadata.all_files,
functional_parquet.iceberg_query_metadata.all_files.equality_ids delete_ids;
{code}
When scanning metadata tables, the whole table and row is read from Iceberg
which means that the "top" level StructLikeRow is returned. But Impala only
creates tuples and slots for the selected slots and tuples. This makes
accessing the values inside StructLikeRows difficult, because it cannot be
accessed through accessors and these have to be accessed through positions.
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