Peter Rozsa created IMPALA-13932:
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Summary: MERGE duplicate check reports false-positive if the
incoming row batch's memory is reused
Key: IMPALA-13932
URL: https://issues.apache.org/jira/browse/IMPALA-13932
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 4.5.0
Reporter: Peter Rozsa
Assignee: Peter Rozsa
The Iceberg merge node uses a duplicate check mechanism that compares the
actual target row's pointer with the previous target row's pointer. If a new
row batch's first target table's tuple points to the same region as the
previous row, then we report a duplicate row erroneously.
The duplicate check should be aware whether the merge join's probe batch is
ended, and this case, resetting the incoming row batch would solve the problem.
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