jackwener opened a new pull request, #3972:
URL: https://github.com/apache/arrow-datafusion/pull/3972
# Which issue does this PR close?
This PR relate #2620.
Currently, we must do optimize recursively in each rules, which is troubled.
It make it's a little hard for putting some rule into optimizer.
```
example:
rule: put `where col = col` into join eliminate cross join, if it's rule, we
just need after pushdown predicate,
filter(t1.id = t2.id)-crossJoin
->
innerjoin()
```
# Rationale for this change
# What changes are included in this PR?
This PR is draft, which present how to make optimizer instead of rule to
handle to travel plantree.
# Are there any user-facing changes?
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