morrySnow opened a new pull request, #64080:
URL: https://github.com/apache/doris/pull/64080
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary: PushProjectThroughUnion allowed cast projections to be
pushed below UNION DISTINCT. For non-injective casts, distinct was then
evaluated after the cast instead of before the cast, which could incorrectly
collapse rows that were distinct in the original union output. Restrict cast
project pushdown to UNION ALL and add tests for the qualifier guard and the
datetime-to-date regression case.
### Release note
None
### Check List (For Author)
- Test: Regression test / Unit Test
- ./run-fe-ut.sh --run
org.apache.doris.nereids.rules.rewrite.PushProjectThroughUnionTest
- ./run-regression-test.sh --run -d nereids_syntax_p0 -s set_operation
- mvn checkstyle:check -pl fe-core
- Behavior changed: No
- Does this need documentation: No
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