[WIP] support left-outer and left-mark hash join impl rules

[yliang412]

Problem

We should be able to convert left-outer join and left-mark logical equi join to hash join.

Summary of changes

• Add implementation rules to handle these cases.

misc

• refactor simplify_log_expr to stop using unreachable!

[yliang412]

tpch Q13 needs a rule to push split a filter from the join node, and then the join could be turned into a left-outer hash join. Working on this now.

...
  ├── cond:And
  │   ├── Eq
  │   │   ├── #0
  │   │   └── #9
  │   └── Like { expr: #16, pattern: "%special%requests%", negated: true, case_insensitive: false }