Bug#52430 Incorrect key in the error message for duplicate key error involving BINARY type

For BINARY(N) strip trailing zeroes to make the error message nice-looking

mysql-test/r/errors.result

@@ -120,3 +120,17 @@ SET sql_quote_show_create= _utf8 x'5452C39C45';
 ERROR 42000: Variable 'sql_quote_show_create' can't be set to the value of 'TRÜE'
 SET sql_quote_show_create=_latin1 x'5452DC45';
 ERROR 42000: Variable 'sql_quote_show_create' can't be set to the value of 'TRÜE'
+#
+# Bug#52430 Incorrect key in the error message for duplicate key error involving BINARY type
+#
+CREATE TABLE t1(c1 BINARY(10), c2 BINARY(10), c3 BINARY(10),
+PRIMARY KEY(c1,c2,c3));
+INSERT INTO t1 (c1,c2,c3) VALUES('abc','abc','abc');
+INSERT INTO t1 (c1,c2,c3) VALUES('abc','abc','abc');
+ERROR 23000: Duplicate entry 'abc-abc-abc' for key 'PRIMARY'
+DROP TABLE t1;
+CREATE TABLE t1 (f1 VARBINARY(19) PRIMARY KEY);
+INSERT INTO t1 VALUES ('abc\0\0');
+INSERT INTO t1 VALUES ('abc\0\0');
+ERROR 23000: Duplicate entry 'abc\x00\x00' for key 'PRIMARY'
+DROP TABLE t1;

mysql-test/r/type_binary.result

@@ -47,7 +47,7 @@ create table t1 (s1 binary(2) primary key);
 insert into t1 values (0x01);
 insert into t1 values (0x0120);
 insert into t1 values (0x0100);
-ERROR 23000: Duplicate entry '\x01\x00' for key 'PRIMARY'
+ERROR 23000: Duplicate entry '\x01' for key 'PRIMARY'
 select hex(s1) from t1 order by s1;
 hex(s1)
 0100

mysql-test/t/errors.test

@@ -140,3 +140,18 @@ SET sql_quote_show_create= _utf8 x'5452C39C45';
 --error ER_WRONG_VALUE_FOR_VAR
 SET sql_quote_show_create=_latin1 x'5452DC45';
 
+--echo #
+--echo # Bug#52430 Incorrect key in the error message for duplicate key error involving BINARY type
+--echo #
+CREATE TABLE t1(c1 BINARY(10), c2 BINARY(10), c3 BINARY(10),
+PRIMARY KEY(c1,c2,c3));
+INSERT INTO t1 (c1,c2,c3) VALUES('abc','abc','abc');
+--error ER_DUP_ENTRY
+INSERT INTO t1 (c1,c2,c3) VALUES('abc','abc','abc');
+DROP TABLE t1;
+
+CREATE TABLE t1 (f1 VARBINARY(19) PRIMARY KEY);
+INSERT INTO t1 VALUES ('abc\0\0');
+--error ER_DUP_ENTRY
+INSERT INTO t1 VALUES ('abc\0\0');
+DROP TABLE t1;

sql/key.cc

@@ -354,6 +354,16 @@ void key_unpack(String *to,TABLE *table,uint idx)
     {
       CHARSET_INFO *cs= field->charset();
       field->val_str(&tmp);
+      /*
+        For BINARY(N) strip trailing zeroes to make
+        the error message nice-looking
+      */
+      if (field->binary() &&  field->type() == MYSQL_TYPE_STRING && tmp.length())
+      {
+        const char *tmp_end= tmp.ptr() + tmp.length();
+        while (tmp_end > tmp.ptr() && !*--tmp_end);
+        tmp.length(tmp_end - tmp.ptr() + 1);
+      }
       if (cs->mbmaxlen > 1 &&
           table->field[key_part->fieldnr - 1]->field_length !=
           key_part->length)