diff --git a/mysql-test/suite/ctc/r/ctc_ddl_func_index.result b/mysql-test/suite/ctc/r/ctc_ddl_func_index.result
index c61b0af2c80c04efe02f38c5c31042f14b6f5918..957ca54bc91769525584481badf70272b0081ee9 100644
--- a/mysql-test/suite/ctc/r/ctc_ddl_func_index.result
+++ b/mysql-test/suite/ctc/r/ctc_ddl_func_index.result
@@ -139,4 +139,58 @@ create table t6 (c1 int, c2 int);
 create index index_func_idx_1 on t6 ((if(c1 = 1, 1, 3)));
 ERROR HY000: Function if is not indexable
 drop table t6;
+create table t7 (c1 varbinary(20));
+insert into t7 values ('ab一二'), ('ab一er');
+create unique index func_idx1 on t7 ((substr(c1, 2, 2)));
+ERROR 23000: Duplicate entry 'bä' for key 't7.func_idx1'
+create unique index func_idx2 on t7 ((substr(c1, 2, 4)));
+ERROR 23000: Duplicate entry 'b一' for key 't7.func_idx2'
+alter table t7 add unique key func_idx3(c1(4));
+ERROR 23000: Duplicate entry 'abä¸' for key 't7.func_idx3'
+create unique index func_idx4 on t7 ((substr(upper(c1), 2, 2)));
+ERROR 23000: Duplicate entry 'Bä' for key 't7.func_idx4'
+drop table t7;
+create table t8 (c1 blob);
+insert into t8 values ('ab一二'), ('ab一er');
+create unique index func_idx1 on t8 ((substr(c1, 2, 2)));
+ERROR 23000: Duplicate entry 'bä' for key 't8.func_idx1'
+create unique index func_idx2 on t8 ((substr(c1, 2, 4)));
+ERROR 23000: Duplicate entry 'b一' for key 't8.func_idx2'
+alter table t8 add unique key func_idx3(c1(4));
+ERROR 23000: Duplicate entry 'abä¸' for key 't8.func_idx3'
+drop table t8;
+create table t9 (c1 varchar(20));
+insert into t9 values ('ab一二'), ('ab一er');
+create unique index func_idx1 on t9 ((substr(c1, 2, 2)));
+ERROR 23000: Duplicate entry 'b一' for key 't9.func_idx1'
+create unique index func_idx2 on t9 ((substr(c1, 2, 4)));
+alter table t9 add unique key func_idx3(c1(4));
+create unique index func_idx4 on t9 ((substr(upper(c1), 2, 2)));
+ERROR 23000: Duplicate entry 'B一' for key 't9.func_idx4'
+drop table t9;
+create table t10 (c1 text);
+insert into t10 values ('ab一二'), ('ab一er');
+create unique index func_idx1 on t10 ((substr(c1, 2, 2)));
+ERROR 23000: Duplicate entry 'b一' for key 't10.func_idx1'
+create unique index func_idx2 on t10 ((substr(c1, 2, 4)));
+alter table t10 add unique key func_idx3(c1(4));
+drop table t10;
+create table t11 (c1 varchar(20)) default charset = binary;
+insert into t11 values ('ab一二'), ('ab一er');
+create unique index func_idx1 on t11 ((substr(c1, 2, 2)));
+ERROR 23000: Duplicate entry 'bä' for key 't11.func_idx1'
+create unique index func_idx2 on t11 ((substr(c1, 2, 4)));
+ERROR 23000: Duplicate entry 'b一' for key 't11.func_idx2'
+alter table t11 add unique key func_idx3(c1(4));
+ERROR 23000: Duplicate entry 'abä¸' for key 't11.func_idx3'
+drop table t11;
+create table t12 (c1 text) default charset = binary;
+insert into t12 values ('ab一二'), ('ab一er');
+create unique index func_idx1 on t12 ((substr(c1, 2, 2)));
+ERROR 23000: Duplicate entry 'bä' for key 't12.func_idx1'
+create unique index func_idx2 on t12 ((substr(c1, 2, 4)));
+ERROR 23000: Duplicate entry 'b一' for key 't12.func_idx2'
+alter table t12 add unique key func_idx3(c1(4));
+ERROR 23000: Duplicate entry 'abä¸' for key 't12.func_idx3'
+drop table t12;
 drop database db1;
diff --git a/mysql-test/suite/ctc/t/ctc_ddl_func_index.test b/mysql-test/suite/ctc/t/ctc_ddl_func_index.test
index df44be2aa111d7fd286c9df930059372621ee829..a4c4fd9cc2ee91540240001729aefb4a4b073797 100644
--- a/mysql-test/suite/ctc/t/ctc_ddl_func_index.test
+++ b/mysql-test/suite/ctc/t/ctc_ddl_func_index.test
@@ -71,4 +71,65 @@ create index index_func_idx_1 on t6 ((if(c1 = 1, 1, 3)));
 
 drop table t6;
 
+# 创建混合中英文字符索引场景
+create table t7 (c1 varbinary(20));
+insert into t7 values ('ab一二'), ('ab一er');
+--error ER_DUP_ENTRY
+create unique index func_idx1 on t7 ((substr(c1, 2, 2)));
+--error ER_DUP_ENTRY
+create unique index func_idx2 on t7 ((substr(c1, 2, 4)));
+--error ER_DUP_ENTRY
+alter table t7 add unique key func_idx3(c1(4));
+--error ER_DUP_ENTRY
+create unique index func_idx4 on t7 ((substr(upper(c1), 2, 2)));
+drop table t7;
+
+create table t8 (c1 blob);
+insert into t8 values ('ab一二'), ('ab一er');
+--error ER_DUP_ENTRY
+create unique index func_idx1 on t8 ((substr(c1, 2, 2)));
+--error ER_DUP_ENTRY
+create unique index func_idx2 on t8 ((substr(c1, 2, 4)));
+--error ER_DUP_ENTRY
+alter table t8 add unique key func_idx3(c1(4));
+drop table t8;
+
+create table t9 (c1 varchar(20));
+insert into t9 values ('ab一二'), ('ab一er');
+--error ER_DUP_ENTRY
+create unique index func_idx1 on t9 ((substr(c1, 2, 2)));
+create unique index func_idx2 on t9 ((substr(c1, 2, 4)));
+alter table t9 add unique key func_idx3(c1(4));
+--error ER_DUP_ENTRY
+create unique index func_idx4 on t9 ((substr(upper(c1), 2, 2)));
+drop table t9;
+
+create table t10 (c1 text);
+insert into t10 values ('ab一二'), ('ab一er');
+--error ER_DUP_ENTRY
+create unique index func_idx1 on t10 ((substr(c1, 2, 2)));
+create unique index func_idx2 on t10 ((substr(c1, 2, 4)));
+alter table t10 add unique key func_idx3(c1(4));
+drop table t10;
+
+create table t11 (c1 varchar(20)) default charset = binary;
+insert into t11 values ('ab一二'), ('ab一er');
+--error ER_DUP_ENTRY
+create unique index func_idx1 on t11 ((substr(c1, 2, 2)));
+--error ER_DUP_ENTRY
+create unique index func_idx2 on t11 ((substr(c1, 2, 4)));
+--error ER_DUP_ENTRY
+alter table t11 add unique key func_idx3(c1(4));
+drop table t11;
+
+create table t12 (c1 text) default charset = binary;
+insert into t12 values ('ab一二'), ('ab一er');
+--error ER_DUP_ENTRY
+create unique index func_idx1 on t12 ((substr(c1, 2, 2)));
+--error ER_DUP_ENTRY
+create unique index func_idx2 on t12 ((substr(c1, 2, 4)));
+--error ER_DUP_ENTRY
+alter table t12 add unique key func_idx3(c1(4));
+drop table t12;
+
 drop database db1;
diff --git a/storage/ctc/ha_ctc_ddl.cc b/storage/ctc/ha_ctc_ddl.cc
index 56d952f3729d3519efaf07ec87c2bc550d41bdb5..aa0c232e85d69127df440740817270e86a9cc6ad 100644
--- a/storage/ctc/ha_ctc_ddl.cc
+++ b/storage/ctc/ha_ctc_ddl.cc
@@ -1228,8 +1228,7 @@ static int ctc_ddl_create_table_fill_foreign_key_info(TcDb__CtcDDLCreateTableDef
 static void ctc_fill_prefix_func_key_part(TcDb__CtcDDLTableKeyPart *req_key_part,
                                           const Field *field, uint16 prefix_len) {
   req_key_part->is_func = true;
-  if (field->real_type() == MYSQL_TYPE_BLOB && field->charset() == &my_charset_bin &&
-      field->is_flag_set(BINARY_FLAG)) {
+  if (field->charset() == &my_charset_bin && field->is_flag_set(BINARY_FLAG)) {
     req_key_part->func_name = const_cast<char *>("substrb");
     snprintf(req_key_part->func_text, FUNC_TEXT_MAX_LEN - 1, "substrb(%s,1,%d)",
             field->field_name, prefix_len);
@@ -1412,7 +1411,11 @@ static void ctc_print_op(TABLE *form, const THD *thd, Item_func *item_func, Stri
 
 static void ctc_print_func(TABLE *form, const THD *thd, Item_func *item_func, String *out)
 {
-    out->append(item_func->func_name());
+    if (item_func->collation.collation == &my_charset_bin && strcmp(item_func->func_name(), "substr") == 0) {
+        out->append("substrb");
+    } else {
+        out->append(item_func->func_name());
+    }
     out->append('(');
     for (uint i = 0; i < item_func->arg_count; i++) {
         if (i != 0) out->append(',');