[tarantool-patches] Re: [PATCH 1/3] sql: fetch primary index for affinity only
Vladislav Shpilevoy
v.shpilevoy at tarantool.org
Fri Jun 1 21:00:49 MSK 2018
Hello. Thanks for the patch! See 2 comments below.
On 01/06/2018 18:16, Kirill Yukhin wrote:
> This small patch removes usages of primary index throughout
> code sql_table_delete_from, limiting use to fetching of
> affinities only. We cannot use space_def here, since primary
> index might contain calculated columns.
1. What are calculated columns?
>
> Part of #3235
> ---
> src/box/sql/delete.c | 54 ++++++++++++++++++++++++++++++++++++----------------
> 1 file changed, 38 insertions(+), 16 deletions(-)
>
> diff --git a/src/box/sql/delete.c b/src/box/sql/delete.c
> index ddad54b..28713c8 100644
> --- a/src/box/sql/delete.c
> +++ b/src/box/sql/delete.c
> @@ -183,6 +183,16 @@ sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
> struct NameContext nc;
> memset(&nc, 0, sizeof(nc));
> nc.pParse = parse;
> + if (tab_list->a[0].pTab == NULL) {
> + struct Table *t = malloc(sizeof(struct Table));
> + if (t == NULL) {
> + sqlite3OomFault(parse->db);
> + goto delete_from_cleanup;
> + }
> + assert(space != NULL);
> + t->def = space->def;
> + tab_list->a[0].pTab = t;
2. Why can not you declare struct Table on the stack at the top of this
function, and here use its address? Can this pTab be used out of
sql_table_delete_from()? And I do not see where do you delete this
table.
> + }
> nc.pSrcList = tab_list;
> if (sqlite3ResolveExprNames(&nc, where))
> goto delete_from_cleanup;
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