morrySnow opened a new pull request, #64366:
URL: https://github.com/apache/doris/pull/64366
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
FE constant folding evaluated each `now()` expression independently, so
multiple `now()` calls in one query could produce different timestamps.
This change records the query start timestamp in `StatementContext` and uses
that value when folding `now()` and its aliases. It also propagates the
timestamp through asynchronous materialized view analysis, rewrite, retry, and
partition execution contexts. Server-side prepared statements reset the
timestamp for each execution.
### Release note
Ensure `now()` and its aliases return a consistent value within one query
execution.
### Check List (For Author)
- Test: Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.nereids.rules.expression.FoldConstantTest`
- `./run-fe-ut.sh --run
org.apache.doris.mtmv.MTMVPlanUtilTest,org.apache.doris.mtmv.MTMVTaskTest`
- `cd fe && mvn checkstyle:check -pl fe-core`
- Behavior changed: Yes. All `now()` calls within one execution use the same
timestamp.
- Does this need documentation: No
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