branches/zip: row_ins_alloc_sys_fields(): Zero out the system columns

DB_TRX_ID, DB_ROLL_PTR and DB_ROW_ID, in order to avoid harmless
Valgrind warnings about uninitialized data.  (The warnings were
harmless, because the fields would be initialized at a later stage.)

ChangeLog

+2009-10-26	The InnoDB Team
+
+	* row/row0ins.c:
+	When allocating a data tuple, zero out the system fields in order
+	to avoid Valgrind warnings about uninitialized fields in
+	dtuple_validate().
+
 2009-10-19	The InnoDB Team
 
 	* mysql-test/innodb_information_schema.test:

row/row0ins.c

@@ -141,7 +141,7 @@ row_ins_alloc_sys_fields(
 
 	dfield = dtuple_get_nth_field(row, dict_col_get_no(col));
 
-	ptr = mem_heap_alloc(heap, DATA_ROW_ID_LEN);
+	ptr = mem_heap_zalloc(heap, DATA_ROW_ID_LEN);
 
 	dfield_set_data(dfield, ptr, DATA_ROW_ID_LEN);
 
@@ -152,7 +152,7 @@ row_ins_alloc_sys_fields(
 	col = dict_table_get_sys_col(table, DATA_TRX_ID);
 
 	dfield = dtuple_get_nth_field(row, dict_col_get_no(col));
-	ptr = mem_heap_alloc(heap, DATA_TRX_ID_LEN);
+	ptr = mem_heap_zalloc(heap, DATA_TRX_ID_LEN);
 
 	dfield_set_data(dfield, ptr, DATA_TRX_ID_LEN);
 
@@ -163,7 +163,7 @@ row_ins_alloc_sys_fields(
 	col = dict_table_get_sys_col(table, DATA_ROLL_PTR);
 
 	dfield = dtuple_get_nth_field(row, dict_col_get_no(col));
-	ptr = mem_heap_alloc(heap, DATA_ROLL_PTR_LEN);
+	ptr = mem_heap_zalloc(heap, DATA_ROLL_PTR_LEN);
 
 	dfield_set_data(dfield, ptr, DATA_ROLL_PTR_LEN);
 }