englefly opened a new pull request, #61224:
URL: https://github.com/apache/doris/pull/61224
### What problem does this PR solve?
SumLiteralRewrite transforms SUM(expr +/- literal) into SUM(expr) +/-
literal * COUNT(expr). When type coercion has introduced an implicit widening
cast (e.g. CAST(smallint_col AS INT)), the rewritten SUM/COUNT still operates
on the wider type, forcing unnecessary wider data reads.
This is redundant because SUM always returns BIGINT for any integer input
(TINYINT/SMALLINT/INT/BIGINT). Strip implicit widening integer casts in
extractSumLiteral() so the aggregate operates on the original narrow column
directly.
This benefits ClickBench Q29-style queries where SUM(col), SUM(col+1),
SUM(col+2) share a narrow integer column — after stripping the cast, SUM(col+1)
and SUM(col+2) reuse the existing SUM(col).
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### 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
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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