Bug#21713 incorrect value for the REFERENTIAL_CONSTRAINTS.UNIQUE_CONSTRAINT_NAME column

added new field 'REFERENCED_TABLE_NAME' to 'referential_constraints' table
field 'UNIQUE_CONSTRAINT_NAME' contains the name of the referenced index

mysql-test/r/information_schema_inno.result

@@ -31,11 +31,11 @@ CREATE TABLE t2(b1 INT, b2 INT, INDEX (b1, b2),
 CONSTRAINT A1
 FOREIGN KEY (b1, b2) REFERENCES t1(a1, a2)
 ON UPDATE CASCADE ON DELETE NO ACTION) ENGINE=INNODB;
-CREATE TABLE t3(b1 INT, b2 INT, INDEX (b1, b2),
+CREATE TABLE t3(b1 INT, b2 INT, INDEX t3_indx (b1, b2),
 CONSTRAINT A2
 FOREIGN KEY (b1, b2) REFERENCES t2(b1, b2)
 ON UPDATE SET NULL ON DELETE RESTRICT) ENGINE=INNODB;
-CREATE TABLE t4(b1 INT, b2 INT, INDEX (b1, b2),
+CREATE TABLE t4(b1 INT, b2 INT, UNIQUE KEY t4_ukey (b1, b2),
 CONSTRAINT A3
 FOREIGN KEY (b1, b2) REFERENCES t3(b1, b2)
 ON UPDATE NO ACTION ON DELETE SET NULL) ENGINE=INNODB;
@@ -45,16 +45,16 @@ FOREIGN KEY (b1, b2) REFERENCES t4(b1, b2)
 ON UPDATE RESTRICT ON DELETE CASCADE) ENGINE=INNODB;
 select a.CONSTRAINT_SCHEMA, b.TABLE_NAME, CONSTRAINT_TYPE,
 b.CONSTRAINT_NAME, UNIQUE_CONSTRAINT_SCHEMA, UNIQUE_CONSTRAINT_NAME,
-MATCH_OPTION, UPDATE_RULE, DELETE_RULE
+MATCH_OPTION, UPDATE_RULE, DELETE_RULE, b.REFERENCED_TABLE_NAME
 from information_schema.TABLE_CONSTRAINTS a,
 information_schema.REFERENTIAL_CONSTRAINTS b
 where a.CONSTRAINT_SCHEMA = 'test' and a.CONSTRAINT_SCHEMA = b.CONSTRAINT_SCHEMA and
 a.CONSTRAINT_NAME = b.CONSTRAINT_NAME;
-CONSTRAINT_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	CONSTRAINT_NAME	UNIQUE_CONSTRAINT_SCHEMA	UNIQUE_CONSTRAINT_NAME	MATCH_OPTION	UPDATE_RULE	DELETE_RULE
-test	t2	FOREIGN KEY	A1	test	t1	NONE	CASCADE	NO ACTION
-test	t3	FOREIGN KEY	A2	test	t2	NONE	SET NULL	RESTRICT
-test	t4	FOREIGN KEY	A3	test	t3	NONE	NO ACTION	SET NULL
-test	t5	FOREIGN KEY	A4	test	t4	NONE	RESTRICT	CASCADE
+CONSTRAINT_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE	CONSTRAINT_NAME	UNIQUE_CONSTRAINT_SCHEMA	UNIQUE_CONSTRAINT_NAME	MATCH_OPTION	UPDATE_RULE	DELETE_RULE	REFERENCED_TABLE_NAME
+test	t2	FOREIGN KEY	A1	test	PRIMARY	NONE	CASCADE	NO ACTION	t1
+test	t3	FOREIGN KEY	A2	test	b1	NONE	SET NULL	RESTRICT	t2
+test	t4	FOREIGN KEY	A3	test	t3_indx	NONE	NO ACTION	SET NULL	t3
+test	t5	FOREIGN KEY	A4	test	t4_ukey	NONE	RESTRICT	CASCADE	t4
 drop tables t5, t4, t3, t2, t1;
 create database `db-1`;
 use `db-1`;

mysql-test/t/information_schema_inno.test

@@ -32,11 +32,11 @@ CREATE TABLE t2(b1 INT, b2 INT, INDEX (b1, b2),
                 CONSTRAINT A1
                 FOREIGN KEY (b1, b2) REFERENCES t1(a1, a2)
                 ON UPDATE CASCADE ON DELETE NO ACTION) ENGINE=INNODB;
-CREATE TABLE t3(b1 INT, b2 INT, INDEX (b1, b2),
+CREATE TABLE t3(b1 INT, b2 INT, INDEX t3_indx (b1, b2),
 		CONSTRAINT A2
 		FOREIGN KEY (b1, b2) REFERENCES t2(b1, b2)
 		ON UPDATE SET NULL ON DELETE RESTRICT) ENGINE=INNODB;
-CREATE TABLE t4(b1 INT, b2 INT, INDEX (b1, b2),
+CREATE TABLE t4(b1 INT, b2 INT, UNIQUE KEY t4_ukey (b1, b2),
                 CONSTRAINT A3
                 FOREIGN KEY (b1, b2) REFERENCES t3(b1, b2)
                 ON UPDATE NO ACTION ON DELETE SET NULL) ENGINE=INNODB;
@@ -45,10 +45,9 @@ CREATE TABLE t5(b1 INT, b2 INT, INDEX (b1, b2),
                 FOREIGN KEY (b1, b2) REFERENCES t4(b1, b2)
                 ON UPDATE RESTRICT ON DELETE CASCADE) ENGINE=INNODB;
 		
-		
 select a.CONSTRAINT_SCHEMA, b.TABLE_NAME, CONSTRAINT_TYPE,
        b.CONSTRAINT_NAME, UNIQUE_CONSTRAINT_SCHEMA, UNIQUE_CONSTRAINT_NAME,
-       MATCH_OPTION, UPDATE_RULE, DELETE_RULE
+       MATCH_OPTION, UPDATE_RULE, DELETE_RULE, b.REFERENCED_TABLE_NAME
 from information_schema.TABLE_CONSTRAINTS a,
      information_schema.REFERENTIAL_CONSTRAINTS b
 where a.CONSTRAINT_SCHEMA = 'test' and a.CONSTRAINT_SCHEMA = b.CONSTRAINT_SCHEMA and

sql/sql_show.cc

@@ -4497,8 +4497,10 @@ get_referential_constraints_record(THD *thd, struct st_table_list *tables,
                              f_key_info->forein_id->length, cs);
       table->field[4]->store(f_key_info->referenced_db->str, 
                              f_key_info->referenced_db->length, cs);
-      table->field[5]->store(f_key_info->referenced_table->str, 
+      table->field[10]->store(f_key_info->referenced_table->str, 
                              f_key_info->referenced_table->length, cs);
+      table->field[5]->store(f_key_info->referenced_key_name->str, 
+                             f_key_info->referenced_key_name->length, cs);
       table->field[6]->store(STRING_WITH_LEN("NONE"), cs);
       table->field[7]->store(f_key_info->update_method->str, 
                              f_key_info->update_method->length, cs);
@@ -5668,6 +5670,7 @@ ST_FIELD_INFO referential_constraints_fields_info[]=
   {"UPDATE_RULE", NAME_LEN, MYSQL_TYPE_STRING, 0, 0, 0},
   {"DELETE_RULE", NAME_LEN, MYSQL_TYPE_STRING, 0, 0, 0},
   {"TABLE_NAME", NAME_LEN, MYSQL_TYPE_STRING, 0, 0, 0},
+  {"REFERENCED_TABLE_NAME", NAME_LEN, MYSQL_TYPE_STRING, 0, 0, 0},
   {0, 0, MYSQL_TYPE_STRING, 0, 0, 0}
 };
 

sql/table.h

@@ -460,6 +460,7 @@ typedef struct st_foreign_key_info
   LEX_STRING *referenced_table;
   LEX_STRING *update_method;
   LEX_STRING *delete_method;
+  LEX_STRING *referenced_key_name;
   List<LEX_STRING> foreign_fields;
   List<LEX_STRING> referenced_fields;
 } FOREIGN_KEY_INFO;

storage/innobase/handler/ha_innodb.cc

@@ -6003,8 +6003,14 @@ ha_innobase::get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
           }
           f_key_info.update_method= make_lex_string(thd, f_key_info.update_method,
                                                     tmp_buff, length, 1);
-
-
+          if (foreign->referenced_index &&
+              foreign->referenced_index->name)
+          {
+            f_key_info.referenced_key_name= 
+              make_lex_string(thd, f_key_info.referenced_key_name,
+                              foreign->referenced_index->name,
+                              strlen(foreign->referenced_index->name), 1);
+          }
 
 	  FOREIGN_KEY_INFO *pf_key_info= ((FOREIGN_KEY_INFO *)
 		  thd->memdup((gptr) &f_key_info,