Csaba Ringhofer created IMPALA-13272:
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Summary: Analyitic function of collections can lead to crash
Key: IMPALA-13272
URL: https://issues.apache.org/jira/browse/IMPALA-13272
Project: IMPALA
Issue Type: Improvement
Reporter: Csaba Ringhofer
Using Impala's test data the following query leads to DCHECK in debug builds
and may cause more subtle issues in RELEASE builds:
{code}
select
row_no
from (
select
arr.small,
row_number() over (
order by arr.inner_struct1.str) as row_no
from functional_parquet.collection_struct_mix t,
t.arr_contains_nested_struct arr
) res
{code}
The following DCHECK is hit:
{code}
tuple.h:296 Check failed: offset != -1
{code}
The problem seems to be with arr.small, which is referenced in the inline view,
but not used in the outer query - removing it from the inline view or adding it
to the outer select leads to avoiding the bug. The problem seems related to
materialization - offset==-1 means that the slot is not materialized, but the
Parquet scanner still tries to materialize it.
It is not clear yet which commit introduced the bug or whether this is a bug in
the planner or the backend.
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