Bug#57924: crash when creating partitioned table with

multiple columns in the partition key

ndb crash if duplicate columns in the partitioning key.

Backport from mysql-5.1-telco-7.0, see bug#53354.

Changed from case sensitive field name comparision
to non case sensitive too.

mysql-test/r/partition_error.result

 drop table if exists t1;
 #
+# Bug#57924: crash when creating partitioned table with
+#            multiple columns in the partition key
+#
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b))
+PARTITION BY KEY(a, b, a);
+ERROR HY000: Field in list of fields for partition function not found in table
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b))
+PARTITION BY KEY(A, b);
+DROP TABLE t1;
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b))
+PARTITION BY KEY(a, b, A);
+ERROR HY000: Field in list of fields for partition function not found in table
+#
 # Bug#49161: Out of memory; restart server and try again (needed 2 bytes)
 #
 CREATE TABLE t1 (a INT) PARTITION BY HASH (a);

mysql-test/suite/ndb/r/ndb_basic.result

@@ -585,6 +585,8 @@ c127 int,
 c128 int,
 primary key using hash(c1)) engine=ndb partition by key(c1);
 drop table t1;
+create table `t1` (`a` int, b int, primary key (a,b)) engine=ndb partition by key(`a`,`b`,`a`);
+ERROR HY000: Field in list of fields for partition function not found in table
 create table t1 (
 a1234567890123456789012345678901234567890 int primary key,
 a12345678901234567890123456789a1234567890 int,

mysql-test/suite/ndb/t/ndb_basic.test

@@ -547,6 +547,13 @@ c128 int,
 primary key using hash(c1)) engine=ndb partition by key(c1);
 drop table t1;
 
+#
+# test bug#53354 - crash when creating partitioned table with multiple columns in the partition key
+#
+
+--error ER_FIELD_NOT_FOUND_PART_ERROR
+create table `t1` (`a` int, b int, primary key (a,b)) engine=ndb partition by key(`a`,`b`,`a`);
+
 #
 # test max size of attribute name and truncation
 #

mysql-test/t/partition_error.test

@@ -10,6 +10,20 @@ drop table if exists t1;
 
 let $MYSQLD_DATADIR= `SELECT @@datadir`;
 
+--echo #
+--echo # Bug#57924: crash when creating partitioned table with
+--echo #            multiple columns in the partition key
+--echo #
+--error ER_FIELD_NOT_FOUND_PART_ERROR
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b))
+PARTITION BY KEY(a, b, a);
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b))
+PARTITION BY KEY(A, b);
+DROP TABLE t1;
+--error ER_FIELD_NOT_FOUND_PART_ERROR
+CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a,b))
+PARTITION BY KEY(a, b, A);
+
 --echo #
 --echo # Bug#49161: Out of memory; restart server and try again (needed 2 bytes)
 --echo #

sql/sql_partition.cc

@@ -761,6 +761,9 @@ static bool handle_list_of_fields(List_iterator<char> it,
   bool result;
   char *field_name;
   bool is_list_empty= TRUE;
+  int fields_handled = 0;
+  char* field_name_array[MAX_KEY];
+
   DBUG_ENTER("handle_list_of_fields");
 
   while ((field_name= it++))
@@ -776,6 +779,25 @@ static bool handle_list_of_fields(List_iterator<char> it,
       result= TRUE;
       goto end;
     }
+
+    /*
+      Check for duplicate fields in the list.
+      Assuming that there are not many fields in the partition key list.
+      If there were, it would be better to replace the for-loop
+      with a more efficient algorithm.
+    */
+
+    field_name_array[fields_handled] = field_name;
+    for (int i = 0; i < fields_handled; ++i)
+    {
+      if (my_strcasecmp(system_charset_info,
+                        field_name_array[i], field_name) == 0)
+      {
+        my_error(ER_FIELD_NOT_FOUND_PART_ERROR, MYF(0));
+        DBUG_RETURN(TRUE);
+      }
+    }
+    fields_handled++;
   }
   if (is_list_empty)
   {