eldenmoon opened a new pull request, #63772:
URL: https://github.com/apache/doris/pull/63772
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: CIR-20398 reports that MATCH predicates fail for VARIANT
dot subcolumn access such as `cast(msg.trace_id as string)`, while the
equivalent bracket access `msg['trace_id']` works. Dot access can leave an
`Alias` around the pruned subcolumn slot, and `CheckMatchExpression` rejected
the aliased slot.
### Release note
Fix MATCH predicates on VARIANT dot subcolumn access such as `msg.trace_id`
so they are accepted like equivalent bracket subcolumn access.
### Check List (For Author)
- Test: Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.nereids.rules.rewrite.CheckMatchExpressionTest`
- Behavior changed: Yes. MATCH validation now accepts alias/cast chains that
resolve to a SlotReference, while still rejecting aliases over non-slot
expressions and root VARIANT MATCH predicates.
- Does this need documentation: No
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