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GH-46642: [Format] Add footnote clarifying REE layout has O(log n) random access #46643

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amoeba merged 1 commit into from
Jun 2, 2025
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GH-46642: [Format] Add footnote clarifying REE layout has O(log n) random access #46643

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5 changes: 4 additions & 1 deletion docs/source/format/Columnar.rst
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Expand Up @@ -40,7 +40,7 @@ while reading this document.
The columnar format has some key features:

* Data adjacency for sequential access (scans)
* O(1) (constant-time) random access
* O(1) (constant-time) random access [#f1]_
* SIMD and vectorization-friendly
* Relocatable without "pointer swizzling", allowing for true zero-copy
access in shared memory
Expand All @@ -52,6 +52,9 @@ data representation and serialization details; issues such as
coordinating mutation of data structures are left to be handled by
implementations.

.. [#f1] Except for the :ref:`run-end-encoded-layout` where random access is
O(log n).

Terminology
===========

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