BiteTheDDDDt opened a new pull request, #64010:
URL: https://github.com/apache/doris/pull/64010
### What problem does this PR solve?
Issue Number: N/A
Related PR: N/A
Problem Summary: Storage expression pushdown previously rebound slot refs to
the expanded reader schema by mutating expression column ids inside segment
iterators. That violates the assumption that pushed-down expressions are
immutable and can produce surprising behavior when the same expression objects
are reused. This change keeps the full scan schema unchanged, adds a project
schema aligned with the final projected columns, and evaluates pushed-down
expressions against a temporary project block. Slot ordinal to tablet column id
mapping now uses the project schema, so no expression mutation is required.
### Release note
None
### Check List (For Author)
- Test: Manual test
- ./build.sh --be
- Behavior changed: No
- Does this need documentation: No
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