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https://issues.apache.org/jira/browse/IMPALA-12763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17812334#comment-17812334
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Daniel Becker commented on IMPALA-12763:
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Note that the error only occurs if codegen is enabled.
> Union with string struct crashes in ASAN
> ----------------------------------------
>
> Key: IMPALA-12763
> URL: https://issues.apache.org/jira/browse/IMPALA-12763
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
>
> In ASAN builds if we UNION ALL an array containing a struct of a string with
> itself Impala crashes. This is how to reproduce it:
> In Hive:
>
> {code:java}
> create table su (arr ARRAY<STRUCT<s: STRING>>) stored as parquet;
> insert into su values (array(named_struct("s", "A")));
> {code}
> In Impala:
> {code:java}
> select 1, arr from su
> union all select 2, arr from su;{code}
> The ASAN error message indicates a heap-use-after-free.
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