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MDEV-29954 Unique hash key on column prefix is computed incorrectly
use the original, not the truncated, field in the long unique prefix, that is, in the hash(left(field, length)) expression. because MyISAM CHECK/REPAIR in compute_vcols() moves table->field but not prefix fields from keyparts. Also, implement Field_string::cmp_prefix() for prefix comparison of CHAR columns to work.
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