Index: ChangeLog
===================================================================
--- ChangeLog	(revision 422)
+++ ChangeLog	(working copy)
@@ -3,6 +3,9 @@
   Functionality added or changed:
 
   Bugs fixed:
+  * Accessing the results of catalog functions could cause a crash when the
+    "Don't cache results" option was set and a forward-only cursor was
+    being used. (Bug #4657)
   * SQLForeignKeys() did not properly escape wildcard characters in its
     table name parameters when retrieving information. (Bug #27723)
   * Calls to SQLSetPos() could cause the driver to incorrectly calculate the
Index: driver/results.c
===================================================================
--- driver/results.c	(revision 422)
+++ driver/results.c	(working copy)
@@ -1293,8 +1293,13 @@
                                          "Wrong fetchtype with FORWARD ONLY cursor",
                                          0));
 
-        if ( (stmt->dbc->flag & FLAG_NO_CACHE) )
+        if ((stmt->dbc->flag & FLAG_NO_CACHE))
+        {
+          if (stmt->result_array)
+            values= stmt->result_array + (cur_row * stmt->result->field_count);
+          else
             values= mysql_fetch_row(stmt->result);
+        }
     }
 
     if ( if_dynamic_cursor(stmt) && set_dynamic_result(stmt) )
Index: test/my_use_result.c
===================================================================
--- test/my_use_result.c	(revision 422)
+++ test/my_use_result.c	(working copy)
@@ -70,8 +70,45 @@
 }
 
 
+/**
+ Bug #4657: "Don't Cache Results" crashes when using catalog functions
+*/
+DECLARE_TEST(t_bug4657)
+{
+  SQLCHAR     name[10];
+  SQLSMALLINT column_count;
+  SQLLEN      name_length;
+
+  ok_sql(hstmt, "DROP TABLE IF EXISTS t_bug4657");
+  ok_sql(hstmt, "CREATE TABLE t_bug4657 (a INT)");
+
+  ok_stmt(hstmt, SQLSetStmtAttr(hstmt, SQL_ATTR_CURSOR_TYPE,
+                                (SQLPOINTER)SQL_CURSOR_FORWARD_ONLY, 0));
+
+  ok_stmt(hstmt, SQLTables(hstmt, (SQLCHAR *)"", SQL_NTS,
+                           (SQLCHAR *)"", SQL_NTS,
+                           (SQLCHAR *)"", SQL_NTS,
+                           (SQLCHAR *)"TABLE,VIEW", SQL_NTS));
+
+  ok_stmt(hstmt, SQLNumResultCols(hstmt, &column_count));
+  is_num(column_count, 5);
+
+  ok_stmt(hstmt, SQLBindCol(hstmt, 3, SQL_C_CHAR, name, sizeof(name),
+                            &name_length));
+  expect_stmt(hstmt, SQLFetch(hstmt), SQL_NO_DATA_FOUND);
+
+  ok_stmt(hstmt, SQLFreeStmt(hstmt, SQL_UNBIND));
+  ok_stmt(hstmt, SQLFreeStmt(hstmt, SQL_CLOSE));
+
+  ok_sql(hstmt, "DROP TABLE IF EXISTS t_bug4657");
+
+  return OK;
+}
+
+
 BEGIN_TESTS
   ADD_TEST(t_use_result)
+  ADD_TEST(t_bug4657)
 END_TESTS