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  1. IMPALA
  2. IMPALA-3006

Impala may use incorrect bit order with BIT_PACKED encoding

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Won't Fix
    • Affects Version/s: Impala 2.5.0
    • Fix Version/s: None
    • Component/s: Backend

      Description

      Wes stated on IMPALA-3000:

      It's unlikely Impala has ever seen this code path as all of its own Parquet data is encoded with the main RLE encoding – but conceivably there could be BIT_PACKED code floating around out there. But then there's a separate issue because BIT_PACKED uses MSB-ordered packing, while BitReader unpacks in LSB order (see the parquet-format). It may be worth disabling BIT_PACKED altogether if it is incorrect.

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              • Assignee:
                Unassigned
                Reporter:
                tarmstrong Tim Armstrong
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                • Created:
                  Updated:
                  Resolved: