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  1. MariaDB Server
  2. MDEV-21543

hp_rec_key_cmp suboptimal comparison

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      hp_rec_key_cmp performs two string comparison in two phases: while the first one it searches
      an octet length of comparing strings and while the second one it does comparison using strnncollsp.
      The main issue is that hp_rec_key_cmp decodes all the comparing strings completely whereas they could differ starting just from their first characters. Besides the fact that this issue has no performance impact in case of fixed length encoding, UTF-8 performance is suffering a lot.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-38712 strnncollsp_nchars() virtual implementations are not correct for PAD SPACE collations

          • Major - Major loss of function.
          • Open
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              Unassigned Unassigned
              georgykirichenko Georgy Kirichenko
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                Updated:

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