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  1. MariaDB ColumnStore
  2. MCOL-5153

Disk-based aggregation fails with ERROR 1815 (HY000): Internal error: TupleAggregateStep::threadedAggregateRowGroups()[24] MCS-2054: Unknown error while aggregation. (part 1)

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    • 2021-17

    Description

      The aggregation on VARCHAR(128) column(number of distinct values is aproximately 31 bln) fails with an obscure error.

      ERROR 1815 (HY000): Internal error: TupleAggregateStep::threadedAggregateRowGroups()[24] MCS-2054: Unknown error while aggregation.  
      

      The current implementation of RowAggStorage::increaseSize() can raise RowAggStorage::Data::fMask 4 times before rehashing happens. The guarding check in increaseSize() is too restrictive and fails easily with big numbers in fCurData->fMask and fCurData->fSize(see RowAggStorage::increaseSize() for details).

      The suggested solution is to increase the multiplier in the expression:

      if (fCurData->fSize * 2 < calcMaxSize(fCurData->fMask + 1))
      

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              alexey.antipovsky Alexey Antipovsky
              drrtuy Roman
              Daniel Lee Daniel Lee (Inactive)
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