1--source include/not_embedded.inc 2--source include/have_ucs2.inc 3 4create or replace table t1 (col1 char(10) character set ucs2, filler char(100), key(col1)) ; 5insert into t1 values ('a', 'a'); 6insert into t1 values ('a', 'a'); 7set optimizer_trace=1; 8explain format=json select * from t1 force index(col1) where col1 >='a'; 9select JSON_DETAILED(JSON_EXTRACT(trace, '$**.analyzing_range_alternatives')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE; 10drop table t1; 11