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https://issues.apache.org/jira/browse/IMPALA-11416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17565918#comment-17565918
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Michael Smith commented on IMPALA-11416:
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I guess Impala doesn't run any checks with MemorySanitizer.
> SlotRef::tuple_is_nullable_ uninitialised for struct children
> -------------------------------------------------------------
>
> Key: IMPALA-11416
> URL: https://issues.apache.org/jira/browse/IMPALA-11416
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
>
> In {{SlotRef::Init}}, {{tuple_is_nullable_}} is only assigned a value if the
> {{SlotRef}} is not within a struct:
> {code:cpp}
> if (!slot_desc_->parent()->isTupleOfStructSlot()) {
> tuple_is_nullable_ = row_desc.TupleIsNullable(tuple_idx_);
> }
> {code}
> https://github.com/apache/impala/blob/fefb9f24be1f99ac0077a8d6ef00834d8e90ef45/be/src/exprs/slot-ref.cc#L103
> Otherwise {{tuple_is_nullable_}} remains uninitialised, leading to undefined
> behaviour when it is read.
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