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  1. MariaDB Server
  2. MDEV-4120

UNIQUE indexes should not be considered for loose index scan

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Details

    • Task
    • Status: Closed (View Workflow)
    • Minor
    • Resolution: Fixed
    • 10.0.5
    • None
    • None

    Description

      Currently the loose scan code in opt_range.cc considers all indexes as possible for the access method. Due to inexact statistics it may happen that a loose scan is selected over a unique index.

      This is clearly wrong since a "loose scan" over a unique index will read the same keys as a direct index scan, but the loose scan has more overhead.

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              timour Timour Katchaounov (Inactive)
              timour Timour Katchaounov (Inactive)
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                Resolved:

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