eldenmoon opened a new pull request, #63479:
URL: https://github.com/apache/doris/pull/63479
### What problem does this PR solve?
Issue Number: close #25672
Related PR: None
Problem Summary: `COUNT(DISTINCT variant_subcolumn)` could reach BE hash key
selection and fail with a vague `INTERNAL_ERROR` when the argument was
`VARIANT`. This PR rejects `VARIANT` arguments during FE aggregate analysis and
keeps a clearer BE fallback for uncaught hash-key paths.
### Release note
`COUNT(DISTINCT ...)` on `VARIANT` arguments now reports a clear
unsupported-type error instead of a BE internal error. Cast `VARIANT`
expressions to `STRING` or another supported scalar type before using `COUNT
DISTINCT`.
### Check List (For Author)
- Test: Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.nereids.trees.expressions.functions.agg.CountTest`
- Regression test added but not run locally because the new worktree
does not have a built output cluster.
- Behavior changed: Yes. `COUNT DISTINCT` on `VARIANT` now fails during
analysis with a clearer error instead of a BE `INTERNAL_ERROR`.
- Does this need documentation: No
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