bug: stuck in a certain case

[BeautyyuYanli]

postgres=# drop table test;
DROP TABLE
postgres=# create table test (embedding vector(3) not null);
CREATE TABLE
postgres=# CREATE INDEX ON test USING vectors (embedding l2_ops)
WITH (options = "capacity = 2097152");
CREATE INDEX
postgres=# insert into test (embedding) values (Array[1,2]::real[]);
ERROR:  called `Result::unwrap()` on an `Err` value: Closed
postgres=# insert into test (embedding) values (Array[1,2,3]::real[]);
<< stuck here >>

I build the index on an empty table and then try inserting a bad vector into it, then inserting another normal vector. It gets stuck.

Potential solution:

• Check the dimension when inserting a new vector, to prevent unexpected behaviors.
• Handle the Err to release locks

[usamoi]

Probably we need to add a check in our code.

[usamoi]

Completed by #117.