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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/04/24 22:49:00 UTC

[jira] [Resolved] (IMPALA-9176) Make access to null-aware partition from PartitionedHashJoinNode read-only

     [ https://issues.apache.org/jira/browse/IMPALA-9176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong resolved IMPALA-9176.
-----------------------------------
    Fix Version/s: Impala 4.0
       Resolution: Fixed

> 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
>            Assignee: Tim Armstrong
>            Priority: Major
>              Labels: multithreading
>             Fix For: Impala 4.0
>
>
> 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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