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

["Tim Armstrong (Jira)" <ji...@apache.org>]

Tim Armstrong created IMPALA-9176:
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             Summary: 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: Sub-task
          Components: Backend
            Reporter: Tim Armstrong


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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