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https://issues.apache.org/jira/browse/IMPALA-9176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-9176:
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Parent: (was: IMPALA-3902)
Issue Type: Improvement (was: Sub-task)
> Make access to null-aware partition from PartitionedHashJoinNode read-only
> --------------------------------------------------------------------------
>
> Key: IMPALA-9176
> URL: https://issues.apache.org/jira/browse/IMPALA-9176
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Tim Armstrong
> Priority: Major
> Labels: multithreading
>
> Currently the accesses to null_aware_partition() are logically read-only
> (since the rows and other state is not mutated) and only accesses the build
> row when pinned, but is implemented using the built-in read iterator of
> BufferedTupleStream. This would prevent sharing of the build side for
> null-aware anti-join.
> We need to either allow multiple read iterators for a pinned stream, or build
> an auxiliary structure, e.g. an array of Tuple ptrs or FlatRowPtr.
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