eldenmoon opened a new pull request, #61177:
URL: https://github.com/apache/doris/pull/61177
When Nereids generates multi-layer projections (e.g., for expressions like
`IFNULL(a, 0) + IFNULL(b, 0)`), the intermediate projection layers reference
slots from intermediate tuples. In short-circuit (point query) execution,
ShortCircuitQueryContext serializes the projection list and sends it to BE.
However, BE evaluates projections directly on scan output and has no knowledge
of intermediate tuples, causing incorrect results or crashes when the
projection references intermediate slot IDs.
This fix adds PlanNode.getPointQueryProjectList() which flattens all
intermediate projection layers into a single-layer projection by substituting
intermediate SlotRefs with their source expressions via ExprSubstitutionMap.
ShortCircuitQueryContext now calls getPointQueryProjectList() instead of
getProjectList() to ensure BE receives fully resolved expressions.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
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- Behavior changed:
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- [ ] Yes. <!-- Explain the behavior change -->
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