Hi, Alexander, that ok, up to you. I'm not looking into the strings/ctype*c code. On Mar 14, Alexander Barkov wrote:

revision-id: 6a3201d3769 (mariadb-10.6.1-336-g6a3201d3769) parent(s): 49ecf935415 author: Alexander Barkov committer: Alexander Barkov timestamp: 2022-02-28 14:05:08 +0400 message:

MDEV-27265 Improve contraction performance in UCA collations

Adding a hash table for contractions.

The old code iterated through all items in MY_CONTRACTIONS, and was much slower, especially for those contractions in the end of the list.

Regards, Sergei VP of MariaDB Server Engineering and security@mariadb.org