MDEV-37442 Fix collation error in mariadb-dump --system=user #4549
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The JOIN between
mysql.userandmysql.role_edgesfails when tableshave different collations after upgrade (old tables keep utf8mb4_general_ci,
new default is utf8mb4_uca1400_ai_ci).
Solution
Add explicit
COLLATE utf8mb4_general_cito the JOIN conditions to ensureconsistent collation comparison regardless of upgrade path.