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  1. IMPALA
  2. IMPALA-9176

Make access to null-aware partition from PartitionedHashJoinNode read-only

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Backend
    • Labels:

      Description

      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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              • Assignee:
                tarmstrong Tim Armstrong
                Reporter:
                tarmstrong Tim Armstrong
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                • Created:
                  Updated: