[patches] [PATCH] sql: disallow id duplicate in insert & update

[Kirill Yukhin]

On 12 мар 15:10, AKhatskevich wrote:
> ## branch https://github.com/tarantool/tarantool/tree/kh/gh-2358-insert-stmt-duplicate
> ## issue https://github.com/tarantool/tarantool/issues/2358
> 
> Before this patch one was able to exec query like this:
>   `insert into t(col1, col1) values(1, 1)`
>   `update t set col1 = 1, col1 = 2;`
> which is nonsense.
> 
> New policy is to throw an error in case of duplicates in columns
> description.
> 
> The fix for insert compares each identifier with the others and
> therefore has O(n^2) complexity. However, it seems that to maintain
> faster data structure just for this small check is redundant.
Why not to use bitset here?

--
Kirill