postgres-github.git / summary / log / commit / refs

commit    f6bd9f0fe25a3cea06e26204cc75cc6e954c4577
Author:   John Naylor <john.naylor@postgresql.org>
Date:     Wed Apr 01 07:18:57 2026 +0000

    Skip common prefixes during radix sort
    
    During the counting step, keep track of the bits that are the same
    for the entire input.  If we counted only a single distinct byte,
    the next recursion will start at the next byte position that has
    more than one distinct byte in the input. This allows us to skip over
    multiple passes where the byte is the same for the entire input.
    
    This provides a significant speedup for integers that have some upper
    bytes with all-zeros or all-ones, which is common.
    
    Reviewed-by: Chengpeng Yan <chengpeng_yan@outlook.com>
    Reviewed-by: ChangAo Chen <cca5507@qq.com>
    Discussion: https://postgr.es/m/CANWCAZYpGMDSSwAa18fOxJGXaPzVdyPsWpOkfCX32DWh3Qznzw@mail.gmail.com

[parent: 21b018e7eab5]