branches/zip: Initialize some uninitialized variables in order to avoid

comparing uninitialized values.

dict_mem_table_create(): Initialize table->version_number.

ins_node_create(): Initialize node->table_version_number.

row_create_prebuilt(): Initialize all fields.  Initialize most fields
by memset(), so that any fields that are added will be initialized
automatically.

dict/dict0mem.c

@@ -52,6 +52,7 @@ dict_mem_table_create(
 	table->flags = (unsigned int) flags;
 	table->name = mem_heap_strdup(heap, name);
 	table->dir_path_of_temp_table = NULL;
+	table->version_number = 0;
 	table->space = (unsigned int) space;
 	table->ibd_file_missing = FALSE;
 	table->tablespace_discarded = FALSE;

row/row0ins.c

@@ -72,6 +72,7 @@ ins_node_create(
 
 	node->state = INS_NODE_SET_IX_LOCK;
 	node->table = table;
+	node->table_version_number = table->version_number;
 	node->index = NULL;
 	node->entry = NULL;
 

row/row0mysql.c

@@ -592,38 +592,20 @@ row_create_prebuilt(
 	dict_index_t*	clust_index;
 	dtuple_t*	ref;
 	ulint		ref_len;
-	ulint		i;
 
-	heap = mem_heap_create(128);
+	heap = mem_heap_create(sizeof *prebuilt + 128);
+
+	prebuilt = mem_heap_alloc(heap, sizeof *prebuilt);
 
-	prebuilt = mem_heap_alloc(heap, sizeof(row_prebuilt_t));
+	memset(prebuilt, 0, sizeof *prebuilt);
 
 	prebuilt->magic_n = ROW_PREBUILT_ALLOCATED;
 	prebuilt->magic_n2 = ROW_PREBUILT_ALLOCATED;
 
 	prebuilt->table = table;
 
-	prebuilt->trx = NULL;
-
 	prebuilt->sql_stat_start = TRUE;
-
-	prebuilt->mysql_has_locked = FALSE;
-
-	prebuilt->index = NULL;
-
-	prebuilt->used_in_HANDLER = FALSE;
-
-	prebuilt->n_template = 0;
-	prebuilt->mysql_template = NULL;
-
 	prebuilt->heap = heap;
-	prebuilt->ins_node = NULL;
-
-	prebuilt->ins_upd_rec_buff = NULL;
-
-	prebuilt->upd_node = NULL;
-	prebuilt->ins_graph = NULL;
-	prebuilt->upd_graph = NULL;
 
 	prebuilt->pcur = btr_pcur_create_for_mysql();
 	prebuilt->clust_pcur = btr_pcur_create_for_mysql();
@@ -631,10 +613,6 @@ row_create_prebuilt(
 	prebuilt->select_lock_type = LOCK_NONE;
 	prebuilt->stored_select_lock_type = 99999999;
 
-	prebuilt->row_read_type = ROW_READ_WITH_LOCKS;
-
-	prebuilt->sel_graph = NULL;
-
 	prebuilt->search_tuple = dtuple_create(
 		heap, 2 * dict_table_get_n_cols(table));
 
@@ -651,16 +629,6 @@ row_create_prebuilt(
 
 	prebuilt->clust_ref = ref;
 
-	for (i = 0; i < MYSQL_FETCH_CACHE_SIZE; i++) {
-		prebuilt->fetch_cache[i] = NULL;
-	}
-
-	prebuilt->n_fetch_cached = 0;
-
-	prebuilt->blob_heap = NULL;
-
-	prebuilt->old_vers_heap = NULL;
-
 	UT_LIST_ADD_LAST(prebuilts, table->prebuilts, prebuilt);
 
 	return(prebuilt);