morrySnow opened a new pull request, #64906:
URL: https://github.com/apache/doris/pull/64906
### What problem does this PR solve?
Issue Number: None
Related PR: #24060
Problem Summary: MergeOneRowRelationIntoUnion previously built constant rows
by matching one-row child projects to UNION outputs by list index. When a UNION
child output used a different position or fewer columns than the one-row child
projects, the rewrite could read past the UNION output list or place the wrong
constant into the UNION constant expression list. The fix builds a
slot-to-expression map from the one-row child and rewrites each regular child
output expression through that map, preserving the UNION child output order and
cardinality.
### Release note
Fix incorrect results or failures for UNION ALL constant queries whose
one-row child output order differs from the UNION output order.
### Check List (For Author)
- Test: Regression test / Unit Test
- ./run-fe-ut.sh --run
org.apache.doris.nereids.rules.rewrite.MergeOneRowRelationIntoUnionTest
- ./run-regression-test.sh --run -d query_p0/compress_materialize -s
compress_materialize -forceGenOut
- Behavior changed: Yes (fixes UNION constant-row rewrite to follow child
output mapping instead of project indexes)
- Does this need documentation: No
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