MDEV-18880: Optimizer trace prints date in hexadecimal

Introduced a print_key_value function to makes sure that the trace prints data in readable format
for readable characters and the rest of the characters are printed as hexadecimal.

1 files changed, 10 insertions, 0 deletions

diff --git a/mysql-test/main/opt_trace_ucs2.test b/mysql-test/main/opt_trace_ucs2.test
new file mode 100644
index 00000000000..827dc403d58
--- /dev/null
+++ b/mysql-test/main/opt_trace_ucs2.test
@@ -0,0 +1,10 @@
+--source include/not_embedded.inc
+--source include/have_ucs2.inc
+
+create or replace table t1 (col1 char(10) character set ucs2, filler char(100), key(col1)) ;
+insert into t1 values ('a', 'a');
+insert into t1 values ('a', 'a');
+set optimizer_trace=1;
+explain format=json select * from t1 force index(col1) where col1 >='a';
+select JSON_DETAILED(JSON_EXTRACT(trace, '$**.analyzing_range_alternatives')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
+drop table t1;