DROP TABLE with quoted identifier containing special characters causes server segfault

Description

Dropping a table whose backtick-quoted name contains embedded single quotes or escape sequences causes mariadbd to segfault instead of returning a normal error.

Version

MariaDB Columnstore 25.10.4 (stable-23.10)

Reproducer

DROP TABLE {{mcol-'a'}};

Variant with escape sequences:

DROP TABLE IF EXISTS {{MCOL-'\n\r\t'}};

Expected

Server returns an error (e.g. table does not exist) and stays alive.

Actual

ERROR 2013 (HY000): Lost connection to server during query

dmesg confirms a real segfault:

mariadbd[1473162]: segfault at 40 ip 00007793656b992d sp ... error 4 in libstdc++.so.6.0.33