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  1. MariaDB ColumnStore
  2. MCOL-4916

Introduce integral type based filtering for columns.

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Details

    • New Feature
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Won't Do
    • 6.1.1
    • 6.4.1
    • PrimProc
    • None
    • 2021-14, 2021-15

    Description

      As of now the code in primitives/linux-port/column.cpp uses ParsedColumnFilter structure that has two shared_array attributes:

      • prestored_argVals to store columns that less then 8 byte.
      • prestored_argVals128 to store columns that are 16 byte wide.
        Consider ParsedColumnFilter for a float column. It uses prestored_argVals that is an array of int64_t to store float values. This forces 2 extra assignment statements in colCompareDispatcherT for all integral types. This also calls for an explicit cast, e.g. (float*)(&prestored_argVals.get()[i]) in a vectorized filter path. Such casts introduces future issues for big-endian platforms.

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            drrtuy Roman
            drrtuy Roman
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              Updated:
              Resolved:

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