Mryange opened a new pull request, #68681:
URL: https://github.com/apache/doris/pull/68681
Nereids derives partition ranges from monotonic date functions. Root cause:
converting epoch values to local time can move backward at a historical time
zone fallback, but the planner previously treated these functions as increasing
across that transition and could prune partitions containing matching rows.
This PR centralizes date monotonicity checks, including the checks used by
casts and date functions, and evaluates time zone transitions within each
bounded partition range. Ranges that cross a relevant transition remain
unpruned, while safe ranges can still be pruned. It also makes FE constant
folding use Doris session time zone aliases: with `CST`, the planner previously
recognized a safe range as monotonic but failed to fold its partition
endpoints, so it could not prune that range. Regression coverage checks both
historical fallback ranges and actual pruning of a safe `CST` range.
### 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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