[jira] [Created] (IMPALA-13272) Analyitic function of collections can lead to crash

["Csaba Ringhofer (Jira)" <ji...@apache.org>]

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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