yujun777 opened a new pull request, #58430:
URL: https://github.com/apache/doris/pull/58430
### What problem does this PR solve?
Join extract OR expressions from case when expression.
1. extract conditions for one side, latter can push down the one side
condition:
```
t1 join t2 on not (case when t1.a = 1 then t2.a else t2.b) + t2.b + t2.c
> 10)
=>
t1 join t2 on not (case when t1.a = 1 then t2.a else t2.b end) + t2.b +
t2.c > 10)
AND (not (t2.a + t2.b + t2.c > 10) or not (t2.b + t2.b +
t2.c > 10))
```
2. extract condition for both sides, which use for OR EXPANSION rule:
the OR EXPANSION condition is and OR expression and the OR's
disjunctions are all hash condition.
```
t1 join t2 on (case when t1.a = 1 then t2.a else t2.b end) = t1.a + t1.b
=>
t1 join t2 on (case when t1.a = 1 then t2.a else t2.b end) = t1.a + t1.b
AND (t2.a = t1.a + t1.b or t2.b = t1.a + t1.b)
```
Notice We don't extract more than one case when like expressions.
because it may generate expressions with combinatorial explosion.
```
(((case c1 then p1 else p2 end) + (case when d1 then q1 else q2 end))) + a
> 10
=>
(p1 + q1 + a > 10)
or (p1 + q2 + a > 10)
or (p2 + q1 + a > 10)
or (p2 + q2 + a > 10)
```
so we only extract at most one case when like expression for each condition.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
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