Alex Chi Z.

every year students will be trapped into weird linker errors...

``` create table t1(v1 int, v2 int); create table t2(key int); create index t2key on t2(key); select * from t1, t2 where v1 + v2 = key; ``` should be...

... so that the implementation of web shell won't be very tricky

... so that we can test large-scale data with BusTub, like TPC-H.

I'd prefer stick to Postgres, that is to say: ``` null == null -> null group by null -> only one group join on null -> don't produce tuple ```

`select *` panic in subquery

3

``` > create table t1(v1 int, v2 int); > explain select * from (select v1 + v1 as v3 from t1) as left; thread 'main' panicked at 'called `Option::unwrap()` on...

explain: improve projection explain

2

``` > create table t1(v1 int, v2 int); > explain select v3 from (select v1 + v1 as v3 from t1); +--------------------------------------------------------------------------------+ | Projection { exprs: [ + { lhs:...

fix(optimizer): support pushdown pk to storage scan

4

Add a new rule that maps null to true so that storage filter on pk can be pushed down.