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  1. IMPALA
  2. IMPALA-9176

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

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • Impala 4.0.0
    • Backend

    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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            tarmstrong Tim Armstrong
            tarmstrong Tim Armstrong
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