morrySnow opened a new pull request, #68367:
URL: https://github.com/apache/doris/pull/68367
### What problem does this PR solve?
Issue Number: N/A
Related PR: None
Problem Summary: `Cast.castNullable` describes the outer result column's
nullability, but does not tell an optimizer whether converting a non-null value
can fail. For example, `ARRAY<STRING> -> ARRAY<INT>` can leave the outer array
non-null while an element conversion fails. This PR adds
`Cast.mayFailOnNonNullInput` as a reusable type-pair and expression-level
analysis. It recurses through ARRAY, MAP, and STRUCT, recognizes BE conversions
proven not to report data-dependent failures, and conservatively treats other
conversions as possibly failing. A strict CAST can report such a failure as an
error, while a non-strict CAST or TRY_CAST may produce NULL. The new API has no
production callers yet.
### Release note
None
### Check List (For Author)
- Test
- [x] Unit Test: `./run-fe-ut.sh --run
org.apache.doris.nereids.trees.expressions.CastTest` (23 passed)
- [x] FE build and Checkstyle:
`MVN_OPT=-Dmaven.build.cache.enabled=false FE_MAVEN_THREADS=4
DISABLE_BUILD_UI=ON ./build.sh --fe --exclude-obs-dependencies --output
/private/tmp/doris-cast-conversion-build`
- Behavior changed:
- [x] No. This adds analysis infrastructure without changing planner
decisions or execution.
- Does this need documentation?
- [x] No.
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