branches/zip: dict_index_find_cols(): Print diagnostic on name mismatch.

This addresses Bug #44571 but does not fix it.
rb://135 approved by Sunny Bains.

ChangeLog

+2009-06-25	The InnoDB Team
+
+	* dict/dict0dict.c:
+	When an index column cannot be found in the table during index
+	creation, display additional diagnostic before an assertion failure.
+	This does NOT fix Bug #44571 InnoDB Plugin crashes on ADD INDEX,
+	but it helps understand the reason of the crash.
+
 2009-06-17	The InnoDB Team
 
 	* row/row0merge.c:

dict/dict0dict.c

@@ -1693,6 +1693,11 @@ dict_index_find_cols(
 		}
 
 		/* It is an error not to find a matching column. */
+		fputs("InnoDB: Error: no matching column for ", stderr);
+		ut_print_name(stderr, NULL, FALSE, field->name);
+		fputs(" in ", stderr);
+		dict_index_name_print(stderr, NULL, index);
+		fputs("!\n", stderr);
 		ut_error;
 
 found: