PDGGK commented on issue #16985:
URL: https://github.com/apache/iotdb/issues/16985#issuecomment-4163842441

   I've submitted a fix for this issue in PR #17411. The root cause was that 
`LastQueryAggTableScanOperator` could still emit a result row when all 
`LastByAccumulator`s had no initialized result after deletion. Two additional 
defensive fixes were included for aligned deletion paths in `FileLoaderUtils` 
and `ModificationUtils`.


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